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Monitoring AGNs with Hβ Asymmetry. IV. First Reverberation Mapping Results of 14 Active Galactic Nuclei 监测具有 Hβ 不对称的 AGN。IV.14 个活动星系核的首次混响绘图结果
The Astrophysical Journal Supplement Series Pub Date : 2024-05-17 DOI: 10.3847/1538-4365/ad3bad
T. Zastrocky, M. Brotherton, P. Du, J. McLane, K. A. Olson, D. A. Dale, H. Kobulnicky, J. Maithil, My L. Nguyen, W. Chick, David H. Kasper, Derek Hand, C. Adelman, Z. Carter, G. Murphree, M. Oeur, T. Roth, S. Schonsberg, M. Caradonna, J. Favro, A. J. Ferguson, I. M. Gonzalez, L. M. Hadding, H. D. Hagler, C. J. Rogers, T. R. Stack, Franklin Chapman, Dong-Wei Bao, Feng Fang, S. Zhai, Sen Yang, Yong-Jie Chen, Hua-Rui Bai, Yi-Xin Fu, Jun-Rong Liu, Zhu-Heng Yao, Yue-Chang Peng, Yu-Yang Songsheng, Yan-Rong Li, Jin-Ming Bai, Chen Hu, M. Xiao, Luis C. Ho, Jian-Min Wang
{"title":"Monitoring AGNs with Hβ Asymmetry. IV. First Reverberation Mapping Results of 14 Active Galactic Nuclei","authors":"T. Zastrocky, M. Brotherton, P. Du, J. McLane, K. A. Olson, D. A. Dale, H. Kobulnicky, J. Maithil, My L. Nguyen, W. Chick, David H. Kasper, Derek Hand, C. Adelman, Z. Carter, G. Murphree, M. Oeur, T. Roth, S. Schonsberg, M. Caradonna, J. Favro, A. J. Ferguson, I. M. Gonzalez, L. M. Hadding, H. D. Hagler, C. J. Rogers, T. R. Stack, Franklin Chapman, Dong-Wei Bao, Feng Fang, S. Zhai, Sen Yang, Yong-Jie Chen, Hua-Rui Bai, Yi-Xin Fu, Jun-Rong Liu, Zhu-Heng Yao, Yue-Chang Peng, Yu-Yang Songsheng, Yan-Rong Li, Jin-Ming Bai, Chen Hu, M. Xiao, Luis C. Ho, Jian-Min Wang","doi":"10.3847/1538-4365/ad3bad","DOIUrl":"https://doi.org/10.3847/1538-4365/ad3bad","url":null,"abstract":"\u0000 We report first-time reverberation-mapping results for 14 active galactic nuclei (AGNs) from the ongoing Monitoring AGNs with Hβ Asymmetry campaign (MAHA). These results utilize optical spectra obtained with the Long Slit Spectrograph on the Wyoming Infrared 2.3 m Telescope between 2017 November and 2023 May. MAHA combines long-duration monitoring with high cadence. We report results from multiple observing seasons for nine of the 14 objects. These results include Hβ time lags, supermassive black hole masses, and velocity-resolved time lags. The velocity-resolved lags allow us to investigate the kinematics of the broad-line region.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"8 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140963939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A 1–bit Raw Voltage-recording System for Dedicated Observations of Transients at Low Radio Frequencies 用于专门观测低无线电频率瞬变的 1 位原始电压记录系统
The Astrophysical Journal Supplement Series Pub Date : 2024-05-16 DOI: 10.3847/1538-4365/ad4296
Kshitij S. Bane, I. V. Barve, G. Gireesh, C. Kathiravan, R. Ramesh
{"title":"A 1–bit Raw Voltage-recording System for Dedicated Observations of Transients at Low Radio Frequencies","authors":"Kshitij S. Bane, I. V. Barve, G. Gireesh, C. Kathiravan, R. Ramesh","doi":"10.3847/1538-4365/ad4296","DOIUrl":"https://doi.org/10.3847/1538-4365/ad4296","url":null,"abstract":"\u0000 Recently we had reported commissioning of a prototype for pulsar observations at low radio frequencies (<100 MHz) using log-periodic dipole antennas in the Gauribidanur Radio Observatory (≈77°E, 14°N) near Bangalore in India (https://www.iiap.res.in/?q=centers/radio). The aforementioned system (the Gauribidanur Pulsar System) is currently being augmented to directly digitize the radio-frequency signals from the individual antennas in the array. Our initial results using a 1–bit raw voltage-recording system indicate that such a back-end receiver offers distinct advantages like (i) simultaneous observations of any set of desired directions in the sky with multiple offline beams and smaller data rate/volume, and (ii) archival of the observed data with minimal resources for reanalysis in the future, either in the same or a different set of directions in the sky.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140967655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results 斯隆数字巡天反响绘图项目:主要成果
The Astrophysical Journal Supplement Series Pub Date : 2024-05-14 DOI: 10.3847/1538-4365/ad3936
Yue Shen, Catherine J. Grier, Keith Horne, Zachary Stone, Jennifer I. Li, Qian Yang, Yasaman Homayouni, Jonathan R. Trump, Scott F. Anderson, W. N. Brandt, Patrick B. Hall, Luis C. Ho, Linhua Jiang, Patrick Petitjean, Donald P. Schneider, Charling Tao, Fergus. R. Donnan, Yusra AlSayyad, Matthew A. Bershady, Michael R. Blanton, Dmitry Bizyaev, Kevin Bundy, Yuguang Chen, Megan C. Davis, Kyle Dawson, Xiaohui Fan, Jenny E. Greene, Hannes Gröller, Yucheng Guo, Héctor Ibarra-Medel, Yuanzhe Jiang, Ryan P. Keenan, Juna A. Kollmeier, Cassandra Lejoly, Zefeng Li, Axel de la Macorra, Maxwell Moe, Jundan Nie, Graziano Rossi, Paul S. Smith, Wei Leong Tee, Anne-Marie Weijmans, Jiachuan Xu, Minghao Yue, Xu Zhou, Zhimin Zhou and Hu Zou
{"title":"The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results","authors":"Yue Shen, Catherine J. Grier, Keith Horne, Zachary Stone, Jennifer I. Li, Qian Yang, Yasaman Homayouni, Jonathan R. Trump, Scott F. Anderson, W. N. Brandt, Patrick B. Hall, Luis C. Ho, Linhua Jiang, Patrick Petitjean, Donald P. Schneider, Charling Tao, Fergus. R. Donnan, Yusra AlSayyad, Matthew A. Bershady, Michael R. Blanton, Dmitry Bizyaev, Kevin Bundy, Yuguang Chen, Megan C. Davis, Kyle Dawson, Xiaohui Fan, Jenny E. Greene, Hannes Gröller, Yucheng Guo, Héctor Ibarra-Medel, Yuanzhe Jiang, Ryan P. Keenan, Juna A. Kollmeier, Cassandra Lejoly, Zefeng Li, Axel de la Macorra, Maxwell Moe, Jundan Nie, Graziano Rossi, Paul S. Smith, Wei Leong Tee, Anne-Marie Weijmans, Jiachuan Xu, Minghao Yue, Xu Zhou, Zhimin Zhou and Hu Zou","doi":"10.3847/1538-4365/ad3936","DOIUrl":"https://doi.org/10.3847/1538-4365/ad3936","url":null,"abstract":"We present the final data from the Sloan Digital Sky Survey (SDSS) Reverberation Mapping (RM) project, a precursor to the SDSS-V Black Hole Mapper RM program. This data set includes 11 yr photometric and 7 yr spectroscopic light curves for 849 broad-line quasars over a redshift range of 0.1 < z < 4.5 and a luminosity range of Lbol = 1044−47.5 erg s−1, along with spectral and variability measurements. We report 23, 81, 125, and 110 RM lags (relative to optical continuum variability) for broad Hα, Hβ, Mg ii, and C iv using the SDSS-RM sample, spanning much of the luminosity and redshift ranges of the sample. Using 30 low-redshift RM active galactic nuclei with dynamical-modeling black hole masses, we derive a new estimate of the average virial factor of for the line dispersion measured from the rms spectrum. The intrinsic scatter of individual virial factors is 0.31 ± 0.07 dex, indicating a factor of 2 systematic uncertainty in RM black hole masses. Our lag measurements reveal significant R–L relations for Hβ and Mg ii at high redshift, consistent with the latest measurements based on heterogeneous samples. While we are unable to robustly constrain the slope of the R–L relation for C iv given the limited dynamic range in luminosity, we found substantially larger scatter in C iv lags at fixed L1350. Using the SDSS-RM lag sample, we derive improved single-epoch (SE) mass recipes for Hβ, Mg ii, and C iv, which are consistent with their respective RM masses as well as between the SE recipes from two different lines, over the luminosity range probed by our sample. The new Hβ and Mg ii recipes are approximately unbiased estimators at given RM masses, but there are systematic biases in the C iv recipe. The intrinsic scatter of SE masses around RM masses is ∼0.45 dex for Hβ and Mg ii, increasing to ∼0.58 dex for C iv.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
β Cephei Pulsators in Eclipsing Binaries Observed with TESS 用 TESS 观测到的食双星中的β开普勒脉冲星
The Astrophysical Journal Supplement Series Pub Date : 2024-05-13 DOI: 10.3847/1538-4365/ad39c5
Christian I. Eze and Gerald Handler
{"title":"β Cephei Pulsators in Eclipsing Binaries Observed with TESS","authors":"Christian I. Eze and Gerald Handler","doi":"10.3847/1538-4365/ad39c5","DOIUrl":"https://doi.org/10.3847/1538-4365/ad39c5","url":null,"abstract":"The combined strength of asteroseismology and empirical stellar basic parameter determinations for in-depth asteroseismic analysis of massive pulsators in eclipsing binaries shows great potential for treating the challenging and mysterious discrepancies between observations and models of stellar structure and the evolution of massive stars. This paper compiles a comprehensive list of massive pulsators in eclipsing binary systems observed with TESS. The TESS light curves and discrete Fourier transforms of a sample of 8055 stars of spectral type B0–B3 were examined for eclipses and stellar pulsations, and the ephemerides of the resulting subsample of massive pulsators in eclipsing binaries were computed. This subsample was also crossmatched with existing catalogs of massive pulsators. Until now, fewer than 30 β Cephei pulsators in eclipsing binaries have been reported in the literature. Here we announce a total of 78 pulsators of the β Cephei type in eclipsing binaries, 59 of which are new discoveries. Forty-three are recognized as definite, and 35 are candidate pulsators. Our sample of pulsating massive stars in eclipsing binaries allows for future asteroseismic modeling to better understand the internal mixing profile and to resolve the mass discrepancy in massive stars. We have already started follow-up work on some of the most interesting candidates.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a 90–600 MHz Meter-wave Solar Radio Spectrometer 开发 90-600 兆赫米波太阳无线电频谱仪
The Astrophysical Journal Supplement Series Pub Date : 2024-05-10 DOI: 10.3847/1538-4365/ad3de7
ShuWang Chang, Bing Wang, Guang Lu, YuPeng Shen, Yu Bai, ZiQian Shang, Lei Zhang, Zhao Wu, YanRui Su, Yao Chen, FaBao Yan
{"title":"Development of a 90–600 MHz Meter-wave Solar Radio Spectrometer","authors":"ShuWang Chang, Bing Wang, Guang Lu, YuPeng Shen, Yu Bai, ZiQian Shang, Lei Zhang, Zhao Wu, YanRui Su, Yao Chen, FaBao Yan","doi":"10.3847/1538-4365/ad3de7","DOIUrl":"https://doi.org/10.3847/1538-4365/ad3de7","url":null,"abstract":"Radio observation is important for understanding coronal mass ejections (CMEs), coronal shock waves, and high-energy electron acceleration. Here, we developed a new Chashan broadband solar radio spectrometer at a meter wavelength for observing the (super)fine structure of the solar radio burst spectrum. In the signal-receiving unit, we adopt an antenna system consisting of a 12 m large-aperture parabolic reflector and dual-line polarized logarithmic periodic feed source, as well as a high-precision Sun-tracking turntable system, all of which ensure the high-precision acquisition of solar radiation signals. For the digital receiver, we use a high-speed analog-to-digital converter with a sampling rate of 1.25 GSPS to directly sample the signal amplified and filtered by the analog receiver, simplifying the structure of the analog receiver, and design a 16k-point fast Fourier transform algorithm in the field programmable gate array to perform time–frequency transformation on the sampled signals. The default frequency and temporal resolution of the system are 76.294 kHz and 0.839 ms (up to 0.21 ms), respectively. The noise coefficient of the system is less than 1 dB, the dynamic range is more than 60 dB, and the sensitivity is as high as 1 sfu. We have observed a large number of radio bursts, including type I radio storms, hundreds of type III, ∼20 type II, and ∼15 type IV bursts in the past year. These high-quality data are useful in the further study of CMEs and associated particle acceleration and the origins of solar radio bursts.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Blueprint for the Milky Way’s Stellar Populations. V. 3D Local Dust Extinction 银河系恒星群的蓝图。V. 三维局部尘埃消减
The Astrophysical Journal Supplement Series Pub Date : 2024-05-10 DOI: 10.3847/1538-4365/ad3641
Deokkeun An, Timothy C. Beers, Anirudh Chiti
{"title":"A Blueprint for the Milky Way’s Stellar Populations. V. 3D Local Dust Extinction","authors":"Deokkeun An, Timothy C. Beers, Anirudh Chiti","doi":"10.3847/1538-4365/ad3641","DOIUrl":"https://doi.org/10.3847/1538-4365/ad3641","url":null,"abstract":"Using a grid of empirically calibrated synthetic spectra developed in our previous study, we construct an all-sky 3D extinction map from the large collection of low-resolution XP spectra in Gaia DR3. Along each line of sight, with an area ranging from 0.2 to 13.4 deg<sup>2</sup>, we determine both the reddening and metallicity of main-sequence stars and model the foreground extinction up to approximately 3 kpc from the Sun. Furthermore, we explore variations in the total-to-selective extinction ratio in our parameter search and identify its mean systematic change across diverse cloud environments in both hemispheres. In regions outside the densest parts of the clouds, our reddening estimates are validated through comparisons with previous reddening maps. However, a notable discrepancy arises in comparison to other independent work based on XP spectra, which can be attributed to systematic offsets in their metallicity estimates. On the other hand, our metallicity scale exhibits reasonable agreement with the high-resolution spectroscopic abundance scale. We also assess the accuracy of the XP spectra by applying our calibrated models, and we confirm an increasing trend of flux overestimation at shorter wavelengths below 400 nm.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Deep Redshift Survey of the Perseus Cluster (A426): Spatial Distribution and Kinematics of Galaxies 英仙座星团(A426)的深红移巡天:星系的空间分布和运动学特征
The Astrophysical Journal Supplement Series Pub Date : 2024-05-09 DOI: 10.3847/1538-4365/ad390d
Wooseok Kang, Ho Seong Hwang, Hyunmi Song, Changbom Park, Narae Hwang and Byeong-Gon Park
{"title":"A Deep Redshift Survey of the Perseus Cluster (A426): Spatial Distribution and Kinematics of Galaxies","authors":"Wooseok Kang, Ho Seong Hwang, Hyunmi Song, Changbom Park, Narae Hwang and Byeong-Gon Park","doi":"10.3847/1538-4365/ad390d","DOIUrl":"https://doi.org/10.3847/1538-4365/ad390d","url":null,"abstract":"We study the global kinematics of the Perseus galaxy cluster (A426) at redshift z = 0.017 using a large sample of galaxies from our new MMT/Hectospec spectroscopic observation for this cluster. The sample includes 1447 galaxies with measured redshifts within 60′ from the cluster center (1148 from this MMT/Hectospec program and 299 from the literature). The resulting spectroscopic completeness is 67% at r-band apparent magnitude rPetro,0 ≤ 18.0 within 60′ from the cluster center. To identify cluster member galaxies in this sample, we develop a new open-source Python package, CausticSNUpy. This code implements the algorithm of the caustic technique and yields 418 member galaxies within 60′ of the cluster. We study the cluster using this sample of member galaxies. The cluster shows no significant signal of global rotation. A statistical test shows that the cluster does not have a noticeable substructure within 30′. We find two central regions where the X-ray-emitting intracluster medium and galaxies show significant velocity differences (>7σ). On a large scale, however, the overall morphology and kinematics between the intracluster medium and galaxies agree well. Our results suggest that the Perseus cluster is a relaxed system and has not experienced a recent merger.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time-domain Field TREASUREHUNT:利用 HST 在 JWST 北黄道极时域场发现的瞬变和变异性
The Astrophysical Journal Supplement Series Pub Date : 2024-05-09 DOI: 10.3847/1538-4365/ad3948
Rosalia O’Brien, Rolf A. Jansen, Norman A. Grogin, Seth H. Cohen, Brent M. Smith, Ross M. Silver, W. P. Maksym, Rogier A. Windhorst, Timothy Carleton, Anton M. Koekemoer, Nimish P. Hathi, Christopher N. A. Willmer, Brenda L. Frye, M. Alpaslan, M. L. N. Ashby, T. A. Ashcraft, S. Bonoli, W. Brisken, N. Cappelluti, F. Civano, C. J. Conselice, V. S. Dhillon, S. P. Driver, K. J. Duncan, R. Dupke, M. Elvis, G. G. Fazio, S. L. Finkelstein, H. B. Gim, A. Griffiths, H. B. Hammel, M. Hyun, M. Im, V. R. Jones, D. Kim, B. Ladjelate, R. L. Larson, S. Malhotra, M. A. Marshall, S. N. Milam, J. D. R. Pierel, J. E. Rhoads, S. A. Rodney, H. J. A. Röttgering, M. J. Rutkowski, R. E. Ryan, M. J. Ward, C. W. White, R. J. van Weeren, X. Zhao, J. Summers, J. C. J. D’Silva, R. Ortiz, A. S. G. Robotham, D. Coe, M. Nonino, N. Pirzkal, H. Yan, T. Acharya
{"title":"TREASUREHUNT: Transients and Variability Discovered with HST in the JWST North Ecliptic Pole Time-domain Field","authors":"Rosalia O’Brien, Rolf A. Jansen, Norman A. Grogin, Seth H. Cohen, Brent M. Smith, Ross M. Silver, W. P. Maksym, Rogier A. Windhorst, Timothy Carleton, Anton M. Koekemoer, Nimish P. Hathi, Christopher N. A. Willmer, Brenda L. Frye, M. Alpaslan, M. L. N. Ashby, T. A. Ashcraft, S. Bonoli, W. Brisken, N. Cappelluti, F. Civano, C. J. Conselice, V. S. Dhillon, S. P. Driver, K. J. Duncan, R. Dupke, M. Elvis, G. G. Fazio, S. L. Finkelstein, H. B. Gim, A. Griffiths, H. B. Hammel, M. Hyun, M. Im, V. R. Jones, D. Kim, B. Ladjelate, R. L. Larson, S. Malhotra, M. A. Marshall, S. N. Milam, J. D. R. Pierel, J. E. Rhoads, S. A. Rodney, H. J. A. Röttgering, M. J. Rutkowski, R. E. Ryan, M. J. Ward, C. W. White, R. J. van Weeren, X. Zhao, J. Summers, J. C. J. D’Silva, R. Ortiz, A. S. G. Robotham, D. Coe, M. Nonino, N. Pirzkal, H. Yan, T. Acharya","doi":"10.3847/1538-4365/ad3948","DOIUrl":"https://doi.org/10.3847/1538-4365/ad3948","url":null,"abstract":"The James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-domain Field (TDF) is a &gt;14′ diameter field optimized for multiwavelength time-domain science with JWST. It has been observed across the electromagnetic spectrum both from the ground and from space, including with the Hubble Space Telescope (HST). As part of HST observations over three cycles (the “TREASUREHUNT” program), deep images were obtained with the Wide Field Camera on the Advanced Camera for Surveys in F435W and F606W that cover almost the entire JWST NEP TDF. Many of the individual pointings of these programs partially overlap, allowing an initial assessment of the potential of this field for time-domain science with HST and JWST. The cumulative area of overlapping pointings is ∼88 arcmin<sup>2</sup>, with time intervals between individual epochs that range between 1 day and 4+ yr. To a depth of <italic toggle=\"yes\">m</italic>\u0000<sub>AB</sub> ≃ 29.5 mag (F606W), we present the discovery of 12 transients and 190 variable candidates. For the variable candidates, we demonstrate that Gaussian statistics are applicable and estimate that ∼80 are false positives. The majority of the transients will be supernovae, although at least two are likely quasars. Most variable candidates are active galactic nuclei (AGNs), where we find 0.42% of the general <italic toggle=\"yes\">z</italic> ≲ 6 field galaxy population to vary at the ∼3<italic toggle=\"yes\">σ</italic> level. Based on a 5 yr time frame, this translates into a random supernova areal density of up to ∼0.07 transients arcmin<sup>−2</sup> (∼245 deg<sup>−2</sup>) per epoch and a variable AGN areal density of ∼1.25 variables arcmin<sup>−2</sup> (∼4500 deg<sup>−2</sup>) to these depths.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CAMEL. II. A 3D Coronal Mass Ejection Catalog Based on Coronal Mass Ejection Automatic Detection with Deep Learning CAMEL.II.基于深度学习的日冕物质抛射自动检测的三维日冕物质抛射目录
The Astrophysical Journal Supplement Series Pub Date : 2024-05-08 DOI: 10.3847/1538-4365/ad37bc
Jiahui Shan, Huapeng Zhang, Lei Lu, Yan Zhang, Li Feng, Yunyi Ge, Jianchao Xue, Shuting Li
{"title":"CAMEL. II. A 3D Coronal Mass Ejection Catalog Based on Coronal Mass Ejection Automatic Detection with Deep Learning","authors":"Jiahui Shan, Huapeng Zhang, Lei Lu, Yan Zhang, Li Feng, Yunyi Ge, Jianchao Xue, Shuting Li","doi":"10.3847/1538-4365/ad37bc","DOIUrl":"https://doi.org/10.3847/1538-4365/ad37bc","url":null,"abstract":"Coronal mass ejections (CMEs) are major drivers of geomagnetic storms, which may cause severe space weather effects. Automating the detection, tracking, and three-dimensional (3D) reconstruction of CMEs is important for operational predictions of CME arrivals. The COR1 coronagraphs on board the Solar Terrestrial Relations Observatory spacecraft have facilitated extensive polarization observations, which are very suitable for the establishment of a 3D CME system. We have developed such a 3D system comprising four modules: classification, segmentation, tracking, and 3D reconstructions. We generalize our previously pretrained classification model to classify COR1 coronagraph images. Subsequently, as there are no publicly available CME segmentation data sets, we manually annotate the structural regions of CMEs using Large Angle and Spectrometric Coronagraph C2 observations. Leveraging transformer-based models, we achieve state-of-the-art results in CME segmentation. Furthermore, we improve the tracking algorithm to solve the difficult separation task of multiple CMEs. In the final module, tracking results, combined with the polarization ratio technique, are used to develop the first single-view 3D CME catalog without requiring manual mask annotation. Our method provides higher precision in automatic 2D CME catalog and more reliable physical parameters of CMEs, including 3D propagation direction and speed. The aforementioned 3D CME system can be applied to any coronagraph data with the capability of polarization measurements.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Accurate Infrared Line Lists for 20 Isotopologues of CS2 at Room Temperature 室温下 20 种 CS2 同素异形体的精确红外谱线表
The Astrophysical Journal Supplement Series Pub Date : 2024-05-08 DOI: 10.3847/1538-4365/ad3809
Xinchuan Huang, Iouli E. Gordon, Sergey A. Tashkun, David W. Schwenke, Timothy J. Lee
{"title":"Accurate Infrared Line Lists for 20 Isotopologues of CS2 at Room Temperature","authors":"Xinchuan Huang, Iouli E. Gordon, Sergey A. Tashkun, David W. Schwenke, Timothy J. Lee","doi":"10.3847/1538-4365/ad3809","DOIUrl":"https://doi.org/10.3847/1538-4365/ad3809","url":null,"abstract":"To facilitate atmospheric and spectroscopic studies of carbon disulfide, or CS<sub>2</sub>, in both planetary and exoplanetary atmospheres, we adopt the “Best Theory + Reliable High-resolution Experiment” algorithm to generate semiempirical IR line lists for the 20 most abundant CS<sub>2</sub> isotopologues, denoted as Ames-296K. The IR lists are computed using the Ames-1 potential energy surface, refined using the experimental transition set and an ab initio dipole moment surface fitted from CCSD(T)/aug-cc-pV(T/Q/5+d)Z dipoles extrapolated to a one-particle basis set limit. The IR lists cover the range of 0–10,000 cm<sup>−1</sup>, with an <italic toggle=\"yes\">S</italic>\u0000<sub>296K</sub> cutoff at 10<sup>−31</sup> cm<sup>−1</sup>/molecule·cm<sup>−2</sup> (abundance included). A “natural” IR line list at 296 K includes about 10 million lines of the 20 isotopologues, with their intensities scaled by the corresponding abundances. The zero-point energy, partition functions, and abundances are reported for each isotopologue. The energy levels in the global effective Hamiltonian model for <sup>12</sup>C<sup>32</sup>S<sub>2</sub> are adopted to improve the line position accuracy. This new IR list for the main isotopologue is denoted as A+I.296K. Reliable HITRAN2020 line positions are also utilized to improve the accuracy of the <sup>32</sup>S<sup>12</sup>C<sup>34</sup>S, <sup>32</sup>S<sup>12</sup>C<sup>33</sup>S, and <sup>32</sup>S<sup>13</sup>C<sup>32</sup>S isotopologue line lists. The final composite line list is validated against Pacific Northwest National Laboratory experimental cross sections, showing excellent agreement. The agreement supports the quality of the composite line list and the power of synergy between experiment and theory. The new data are proposed for use in updating and expanding the CS<sub>2</sub> data in HITRAN and other high-resolution IR databases. Supplementary files are available in Zenodo and AHED.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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