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The Chandra Source Catalog Release 2 Series 钱德拉源目录第 2 版系列
The Astrophysical Journal Supplement Series Pub Date : 2024-09-15 DOI: 10.3847/1538-4365/ad6319
Ian N. Evans, Janet D. Evans, J. Rafael Martínez-Galarza, Joseph B. Miller, Francis A. Primini, Mojegan Azadi, Douglas J. Burke, Francesca M. Civano, Raffaele D’Abrusco, Giuseppina Fabbiano, Dale E. Graessle, John D. Grier, John C. Houck, Jennifer Lauer, Michael L. McCollough, Michael A. Nowak, David A. Plummer, Arnold H. Rots, Aneta Siemiginowska and Michael S. Tibbetts
{"title":"The Chandra Source Catalog Release 2 Series","authors":"Ian N. Evans, Janet D. Evans, J. Rafael Martínez-Galarza, Joseph B. Miller, Francis A. Primini, Mojegan Azadi, Douglas J. Burke, Francesca M. Civano, Raffaele D’Abrusco, Giuseppina Fabbiano, Dale E. Graessle, John D. Grier, John C. Houck, Jennifer Lauer, Michael L. McCollough, Michael A. Nowak, David A. Plummer, Arnold H. Rots, Aneta Siemiginowska and Michael S. Tibbetts","doi":"10.3847/1538-4365/ad6319","DOIUrl":"https://doi.org/10.3847/1538-4365/ad6319","url":null,"abstract":"The Chandra Source Catalog (CSC) is a virtual X-ray astrophysics facility that enables both detailed individual source studies and statistical studies of large samples of X-ray sources detected in Advanced CCD Imaging Spectrometer and High Resolution Camera-I imaging observations obtained by the Chandra X-ray Observatory. The catalog provides carefully curated, high-quality, and uniformly calibrated and analyzed tabulated positional, spatial, photometric, spectral, and temporal source properties, as well as science-ready X-ray data products. The latter includes multiple types of source- and field-based FITS format products that can be used as a basis for further research, significantly simplifying follow-up analysis of scientifically meaningful source samples. We discuss in detail the algorithms used for the CSC Release 2 Series, including CSC 2.0, which includes 317,167 unique X-ray sources on the sky identified in observations released publicly through the end of 2014, and CSC 2.1, which adds Chandra data released through the end of 2021 and expands the catalog to 407,806 sources. Besides adding more recent observations, the CSC Release 2 Series includes multiple algorithmic enhancements that provide significant improvements over earlier releases. The compact source sensitivity limit for most observations is ∼5 photons over most of the field of view, which is ∼2× fainter than Release 1, achieved by coadding observations and using an optimized source detection approach. A Bayesian X-ray aperture photometry code produces robust fluxes even in crowded fields and for low-count sources. The current release, CSC 2.1, is tied to the Gaia-CRF3 astrometric reference frame for the best sky positions for catalog sources.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268020","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
Statistics and Habitability of F-type Star–Planet Systems F 型恒星-行星系统的统计和可居住性
The Astrophysical Journal Supplement Series Pub Date : 2024-09-11 DOI: 10.3847/1538-4365/ad65eb
Shaan D. Patel, Manfred Cuntz and Nevin N. Weinberg
{"title":"Statistics and Habitability of F-type Star–Planet Systems","authors":"Shaan D. Patel, Manfred Cuntz and Nevin N. Weinberg","doi":"10.3847/1538-4365/ad65eb","DOIUrl":"https://doi.org/10.3847/1538-4365/ad65eb","url":null,"abstract":"F-type star–planet systems represent an intriguing case for habitability studies. Although F-type stars spend considerably less time on the main sequence (MS) than G-, K-, and M-type stars, they still offer a unique set of features, allowing for the principal possibility of exolife. Examples of these features include the increased widths of stellar habitable zones as well as the presence of enhanced UV flux, which in moderation may have added to the origin of life in the Universe. In this study, we pursue a detailed statistical analysis of the currently known planet-hosting F-type stars by making use of the NASA Exoplanet Archive. After disregarding systems with little or no information on the planet(s), we identify 206 systems of interest. We also evaluate whether the stars are on the MS based on various criteria. In one approach, we use the stellar evolution code MESA. Depending on the adopted criterion, about 60–80 stars have been identified as MS stars. In 18 systems, the planet spends at least part of its orbit within the stellar habitable zone. In one case, i.e., HD 111998, known as 38 Vir, the planet is situated in the habitable zone at all times. Our work may serve as a basis for future studies, including studies on the existence of Earth-mass planets in F-type systems, as well as investigations of possibly habitable exomoons hosted by exo-Jupiters, as the lowest-mass habitable zone planet currently identified has a mass estimate of 143 Earth masses.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187578","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 Comprehensive Timing Analysis of Individual Pulses in X-Ray Bursts from SGR J0501+4516 来自 SGR J0501+4516 的 X 射线爆发中单个脉冲的综合定时分析
The Astrophysical Journal Supplement Series Pub Date : 2024-09-11 DOI: 10.3847/1538-4365/ad6dd1
Jiao-Jiao Yang, Shuo Xiao, Zheng-Huo Jiang, Tong-Lei Liao, Mei-Xin Hong and Xi-Hong Luo
{"title":"A Comprehensive Timing Analysis of Individual Pulses in X-Ray Bursts from SGR J0501+4516","authors":"Jiao-Jiao Yang, Shuo Xiao, Zheng-Huo Jiang, Tong-Lei Liao, Mei-Xin Hong and Xi-Hong Luo","doi":"10.3847/1538-4365/ad6dd1","DOIUrl":"https://doi.org/10.3847/1538-4365/ad6dd1","url":null,"abstract":"The pulses in X-ray-burst (XRB) light curves from soft gamma-ray repeaters (SGRs) are generally thought to arise from magnetic crustal fractures or magnetic reconnection, reflecting the evolution of the energy release process in magnetars. In this study, we conduct a comprehensive timing analysis of 27 XRBs from SGR J0501+4156 detected by the Gamma-ray Burst Monitor on board Fermi. Utilizing a improved pulse-finding algorithm, we identify a total of 95 pulses and fit them using multiple FRED functions to obtain pulse-shape parameters based on the Markov Chain Monte Carlo method. We calculate the minimum variability timescales (MVTs) of the XRBs based on the shortest pulse; the distribution of MVTs follows a log-Gaussian function with a mean of ms (1σ). The distributions of rise time, decay time, waiting time, width, skewness, and peakedness all follow the log-Gaussian function, and multiple power-law dependencies are observed between them; for example, a power-law positive correlation between decay time and rise time with 4.7σ, and a power-law negative correlation between pulse width and peakedness with 6.8σ. Besides, there is a positive correlation with 3.7σ between the number of pulses and burst duration. Our findings favor a magnetospheric origin, and some similarities with gamma-ray bursts imply that they have similar radiation mechanisms, e.g., magnetic reconnection processes.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187579","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
FAST Ultra-Deep Survey: Data Release for FUDS0 FAST 超深空探测:FUDS0 数据发布
The Astrophysical Journal Supplement Series Pub Date : 2024-09-09 DOI: 10.3847/1538-4365/ad67d5
Hongwei Xi, Bo Peng, Lister Staveley-Smith, Bi-Qing For, Bin Liu and Dejian Ding
{"title":"FAST Ultra-Deep Survey: Data Release for FUDS0","authors":"Hongwei Xi, Bo Peng, Lister Staveley-Smith, Bi-Qing For, Bin Liu and Dejian Ding","doi":"10.3847/1538-4365/ad67d5","DOIUrl":"https://doi.org/10.3847/1538-4365/ad67d5","url":null,"abstract":"We have used the Five-hundred-meter Aperture Spherical radio Telescope (FAST) to conduct a blind ultradeep survey for neutral hydrogen (H i). We present the complete results from the first of six fields (FUDS0). These observations of 95 hr allowed us to achieve a high-sensitivity (∼50 μJy beam−1) and a high-frequency resolution (22.9 kHz) over an area of 0.72 deg2. We detected 128 galaxies in H i distributed over the redshift range of 0 < z < 0.4, with H i masses in the range of , and three faint high-velocity clouds, with a peak column density of NH i ≤ 3.1 × 1017 cm−2. Of the galaxies, 95 are new detections and six have z > 0.38, where no unlensed H i emission has previously been directly detected. Estimates of completeness and reliability are presented for the catalog. The consistency of continuum and H i flux estimates with the NRAO VLA Sky Survey and the Arecibo Ultra-Deep Survey, respectively, confirms the accuracy of the calibration method and data reduction pipeline developed for the full FAST Ultra-Deep Survey.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187535","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
New Strong Gravitational Lenses from the DESI Legacy Imaging Surveys Data Release 9 来自 DESI 遗留成像巡天数据第 9 版的新强引力透镜
The Astrophysical Journal Supplement Series Pub Date : 2024-09-09 DOI: 10.3847/1538-4365/ad527e
C. Storfer, X. Huang, A. Gu, W. Sheu, S. Banka, A. Dey, J. Inchausti Reyes, A. Jain, K. J. Kwon, D. Lang, V. Lee, A. Meisner, J. Moustakas, A. D. Myers, S. Tabares-Tarquinio, E. F. Schlafly, D. J. Schlegel
{"title":"New Strong Gravitational Lenses from the DESI Legacy Imaging Surveys Data Release 9","authors":"C. Storfer, X. Huang, A. Gu, W. Sheu, S. Banka, A. Dey, J. Inchausti Reyes, A. Jain, K. J. Kwon, D. Lang, V. Lee, A. Meisner, J. Moustakas, A. D. Myers, S. Tabares-Tarquinio, E. F. Schlafly, D. J. Schlegel","doi":"10.3847/1538-4365/ad527e","DOIUrl":"https://doi.org/10.3847/1538-4365/ad527e","url":null,"abstract":"We have conducted a search for strong gravitational lensing systems in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys Data Release 9. This is the third paper in a series. These surveys together cover ∼19,000 deg<sup>2</sup> visible from the Northern Hemisphere, reaching a <italic toggle=\"yes\">z</italic>-band AB magnitude of ∼22.5. We use a deep residual neural network, trained on a compilation of known lensing systems and high-grade candidates as well as nonlenses in the same footprint. After applying our trained neural network to the survey data, we visually inspect and rank images with probabilities above a threshold which has been chosen to balance precision and recall. We have found 1895 lens candidates, of which 1512 are identified for the first time. Combining the discoveries from this work with those from Papers I (335) and II (1210), we have discovered a total of 3057 new candidates in the Legacy Surveys.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187536","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 Swift X-Ray View of the SMS4 Sample. II. X-Ray Properties of 17 Bright Radio Sources SMS4 样品的 Swift X 射线视图。II.17 个明亮射电源的 X 射线特性
The Astrophysical Journal Supplement Series Pub Date : 2024-09-09 DOI: 10.3847/1538-4365/ad5dac
Alessandro Maselli, William R. Forman, Christine Jones, Ralph P. Kraft, Matteo Perri
{"title":"A Swift X-Ray View of the SMS4 Sample. II. X-Ray Properties of 17 Bright Radio Sources","authors":"Alessandro Maselli, William R. Forman, Christine Jones, Ralph P. Kraft, Matteo Perri","doi":"10.3847/1538-4365/ad5dac","DOIUrl":"https://doi.org/10.3847/1538-4365/ad5dac","url":null,"abstract":"Based on a proposal to observe 18 bright radio sources from the SMS4 catalog with the Neil Gehrels Swift Observatory (hereafter Swift), we obtained X-ray observations of 17 targets (one target was not observed). Following up our first paper that discussed 31 sources (see Maselli et al.; 20 sources detected as point sources and one very extended source), we present results for this final sample of 17 radio sources that previously lacked dedicated, pointed narrow-field-of-view (FOV) X-ray observations. One of these 17 sources, undetected by Swift due to a very short exposure, was instead detected by eROSITA, and given in the Data Release 1 (DR1) Catalog. No 1eRASS source was found in the DR1 for the remaining source, unobserved by Swift. The new Swift observations led to 11 X-ray source detections in the 0.3–10 keV band and six upper limits. We investigated the extent of the X-ray emission and the hardness ratio, and when statistics allowed, we carried out a spectral analysis. The X-ray emission of eight sources is consistent with pointlike emission, while three sources show clear evidence of extent, each with peculiar properties. We used the X-ray determined positions and uncertainties of the 12 detected sources to establish associations with infrared and optical sources from the AllWISE and the GSC 2.4.2 catalogs. Requiring a detection in both the infrared and the optical bands to establish a candidate counterpart for our X-ray detections, we identify counterparts for all 12 sources. Following this X-ray-based approach to derive the position of the active nucleus, we are able to confirm the same IR counterparts previously proposed by White et al. for eight sources, and provide four new IR candidates. In the optical, we identify counterparts that match the candidates previously given by Burgess &amp; Hunstead for all sources. We discuss the interesting structure of MRC B0344−345 and PKS B2148−555, two of the six extended X-ray sources that we detected in both our Swift campaigns, and suggest they are very promising for further X-ray and radio investigations. For the 38 SMS4 sources that lack pointed, narrow-FOV X-ray telescope observations, after our Swift campaigns, we list 18 likely counterparts from the eROSITA DR1 catalog.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187537","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 Self-organized Criticality Behaviors of Pulses in Magnetar Bursts 磁星爆发脉冲的自组织临界行为
The Astrophysical Journal Supplement Series Pub Date : 2024-09-04 DOI: 10.3847/1538-4365/ad6b18
Shuo Xiao, Mei-Xin Hong, Zi-Yi You, Tong-Lei Liao, Shao-Lin Xiong, Shu-Xu Yi, Ping Wang, Jiao-Jiao Yang, Zheng-Huo Jiang, Yue Wang, Yan-Qiu Zhang, Ming-Yu Ge, Zhen Zhang, Xi-Hong Luo, Shi-Jun Dang, Ru-shuang Zhao, Ai-Jun Dong, Qi-Jun Zhi, He Gao, Di Li, Shuang-Nan Zhang
{"title":"The Self-organized Criticality Behaviors of Pulses in Magnetar Bursts","authors":"Shuo Xiao, Mei-Xin Hong, Zi-Yi You, Tong-Lei Liao, Shao-Lin Xiong, Shu-Xu Yi, Ping Wang, Jiao-Jiao Yang, Zheng-Huo Jiang, Yue Wang, Yan-Qiu Zhang, Ming-Yu Ge, Zhen Zhang, Xi-Hong Luo, Shi-Jun Dang, Ru-shuang Zhao, Ai-Jun Dong, Qi-Jun Zhi, He Gao, Di Li, Shuang-Nan Zhang","doi":"10.3847/1538-4365/ad6b18","DOIUrl":"https://doi.org/10.3847/1538-4365/ad6b18","url":null,"abstract":"The overall temporal and spectral characteristics (e.g., duration, fluence, peak flux, peak count rate, and total counts) of X-ray bursts (XRBs) originating from magnetars have been extensively studied to confirm their self-organized criticality (SOC) behaviors. However, for the pulses in XRBs, which are an important part of unraveling radiation processes such as magnetic reconnection and crustal rupture, their variable statistical characteristics are still unclear. In this work, we investigate the distributions of fluctuations in duration, waiting time, peak count rate, and total counts of pulses within bursts from two active and prolific magnetars, SGR J1935+2154 and SGR J1550-5418, observed by Fermi’s Gamma-ray Burst Monitor, Insight-HXMT, and GECAM. We report that the waiting time for pulses follows SOC, whereas previous studies indicated for bursts do not, possibly due to incomplete observations. Besides, the duration, peak count rate, and total counts for pulses are also SOC behaviors. The <italic toggle=\"yes\">α</italic>-values for the duration of pulses for both magnetars are ∼2, and the inferred Euclidean dimension <italic toggle=\"yes\">S</italic> is 3. Our findings provide evidence for the SOC of each radiation process during a burst, for example, multiple pulses produced by multiple magnetic reconnections triggered by a single starquake. Finally, the similar statistical characteristics for pulses from both magnetars lend support to their shared radiation processes.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187540","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
ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters ALMA-IMF.XIV.从 15 个大质量原星团中的 H41α 和电离气体含量得出的自由-自由模板
The Astrophysical Journal Supplement Series Pub Date : 2024-09-04 DOI: 10.3847/1538-4365/ad61e6
Roberto Galván-Madrid, Daniel J. Díaz-González, Frédérique Motte, Adam Ginsburg, Nichol Cunningham, Karl M. Menten, Mélanie Armante, Mélisse Bonfand, Jonathan Braine, Timea Csengeri, Pierre Dell’Ova, Fabien Louvet, Thomas Nony, Rudy Rivera-Soto, Patricio Sanhueza, Amelia M. Stutz, Friedrich Wyrowski, Rodrigo H. Álvarez-Gutiérrez, Tapas Baug, Sylvain Bontemps, Leonardo Bronfman, Manuel Fernández-López, Antoine Gusdorf, Atanu Koley, Hong-Li Liu, Javiera Salinas, Allison P. M. Towner, Anthony P. Whitworth
{"title":"ALMA-IMF. XIV. Free–Free Templates Derived from H41α and Ionized Gas Content in 15 Massive Protoclusters","authors":"Roberto Galván-Madrid, Daniel J. Díaz-González, Frédérique Motte, Adam Ginsburg, Nichol Cunningham, Karl M. Menten, Mélanie Armante, Mélisse Bonfand, Jonathan Braine, Timea Csengeri, Pierre Dell’Ova, Fabien Louvet, Thomas Nony, Rudy Rivera-Soto, Patricio Sanhueza, Amelia M. Stutz, Friedrich Wyrowski, Rodrigo H. Álvarez-Gutiérrez, Tapas Baug, Sylvain Bontemps, Leonardo Bronfman, Manuel Fernández-López, Antoine Gusdorf, Atanu Koley, Hong-Li Liu, Javiera Salinas, Allison P. M. Towner, Anthony P. Whitworth","doi":"10.3847/1538-4365/ad61e6","DOIUrl":"https://doi.org/10.3847/1538-4365/ad61e6","url":null,"abstract":"We use the H41<italic toggle=\"yes\">α</italic> recombination line to create templates of the millimeter free–free emission in the ALMA-IMF continuum maps, which allows us to separate it from dust emission. This method complements spectral-index information and extrapolation from centimeter-wavelength maps. We use the derived maps to estimate the properties of up to 34 H <sc>ii</sc> regions across the ALMA-IMF protoclusters. The hydrogen ionizing photon rate <italic toggle=\"yes\">Q</italic>\u0000<sub>0</sub> and spectral types follow the evolutionary trend proposed by Motte et al. The youngest protoclusters lack detectable ionized gas, followed by protoclusters with increasing numbers of OB stars. The total <italic toggle=\"yes\">Q</italic>\u0000<sub>0</sub> increases from ∼10<sup>45</sup> s<sup>−1</sup> to &gt;10<sup>49</sup> s<sup>−1</sup>. We used the adjacent He41<italic toggle=\"yes\">α</italic> line to measure the relative number abundances of helium, finding values consistent with the Galactic interstellar medium, although a few outliers are discussed. A search for sites of maser amplification of the H41<italic toggle=\"yes\">α</italic> line returned negative results. We looked for possible correlations between the electron densities, emission measures, and <italic toggle=\"yes\">Q</italic>\u0000<sub>0</sub> with H <sc>ii</sc> region size <italic toggle=\"yes\">D</italic>. The latter is the best correlated, with <italic toggle=\"yes\">Q</italic>\u0000<sub>0</sub> ∝ <italic toggle=\"yes\">D</italic>\u0000<sup>2.49 ± 0.18</sup>. This favors interpretations in which smaller ultracompact H <sc>ii</sc> regions are not necessarily the less dynamically evolved versions of larger ones but rather are ionized by less massive stars. Moderate correlations were found between the dynamical width Δ<italic toggle=\"yes\">V</italic>\u0000<sub>dyn</sub> with <italic toggle=\"yes\">D</italic> and <italic toggle=\"yes\">Q</italic>\u0000<sub>0</sub>. Δ<italic toggle=\"yes\">V</italic>\u0000<sub>dyn</sub> increases from about 1 to 2 times the ionized-gas sound speed. Finally, an outlier H <sc>ii</sc> region south of W43-MM2 is discussed. We suggest that this source could harbor an embedded stellar or disk wind.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187538","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
Precise Transit Photometry Using TESS. II. Revisiting 28 Additional Transiting Systems with Updated Physical Properties 利用 TESS 进行精确凌日光度测量。II.用更新的物理特性重新审视另外 28 个凌日系统
The Astrophysical Journal Supplement Series Pub Date : 2024-09-03 DOI: 10.3847/1538-4365/ad6a60
Suman Saha
{"title":"Precise Transit Photometry Using TESS. II. Revisiting 28 Additional Transiting Systems with Updated Physical Properties","authors":"Suman Saha","doi":"10.3847/1538-4365/ad6a60","DOIUrl":"https://doi.org/10.3847/1538-4365/ad6a60","url":null,"abstract":"Precise physical properties of the known transiting exoplanets are essential for their precise atmospheric characterization using modern and upcoming instruments. Leveraging the large volume of high-signal-to-noise-ratio photometric follow-up data from TESS, highly precise physical properties can be estimated for these systems, especially for those discovered using ground-based instruments prior to the TESS mission. In this work, I have used the publicly available TESS follow-up data for 28 transiting systems with 10 &lt; <italic toggle=\"yes\">V</italic>\u0000<sub>mag</sub> &lt; 10.5, with an aim to update their known physical properties. The observed lightcurves have been analyzed by implementing a state-of-the-art critical noise treatment algorithm to effectively reduce both time-correlated and uncorrelated noise components, using sophisticated techniques like wavelet denoising and Gaussian-process regression. Compared with the previous studies, the estimated transit parameters are found to be more precise for most of the targets, including a few cases where a larger space-based instrument like Spitzer, Kepler, or CHEOPS has been used in the previous study. The large volume of transit observations used for each target has also resulted in a more accurate estimation of the physical properties, as this overcomes any error in parameter estimations from bias present in a smaller volume of data. Thus, comparing with the literature values, statistically significant improvements in the known physical properties of several targeted systems have been reported from this work. The large volume of transit-timing information from the analyses was also used to search for transit-timing variation trends in these targets, which has resulted in no significant detection.","PeriodicalId":22368,"journal":{"name":"The Astrophysical Journal Supplement Series","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187539","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
pop-cosmos: A Comprehensive Picture of the Galaxy Population from COSMOS Data pop-cosmos:从 COSMOS 数据中全面了解星系群体
The Astrophysical Journal Supplement Series Pub Date : 2024-09-02 DOI: 10.3847/1538-4365/ad5c69
Justin Alsing, Stephen Thorp, Sinan Deger, Hiranya V. Peiris, Boris Leistedt, Daniel Mortlock, Joel Leja
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