Monthly Notices of the Royal Astronomical Society: Letters最新文献_第8页

Interface of Equation-of-State, Atomic Data and Opacities in the Solar Problem 太阳问题中状态方程、原子数据和不透明性的接口

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-04 DOI: 10.1093/mnrasl/slad154

Anil K Pradhan

引用次数: 0

Origin of flat-top electron distributions at the Earth’s bow shock 地球弓形激波平顶电子分布的起源

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-04 DOI: 10.1093/mnrasl/slad146

Krzysztof Stasiewicz

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First constraints on the strength of the extragalactic magnetic field from γ-ray observations of GRB 221009A GRB 221009A γ射线观测对河外磁场强度的首次约束

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-03 DOI: 10.1093/mnrasl/slad142

Timur A Dzhatdoev, Egor I Podlesnyi, Grigory I Rubtsov

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Growing Local arm inferred by the breathing motion 通过呼吸运动推断当地手臂的增长情况

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-03 DOI: 10.1093/mnrasl/slad190

T. Asano, Daisuke Kawata, Michiko S. Fujii, Junichi Baba

{"title":"Growing Local arm inferred by the breathing motion","authors":"T. Asano, Daisuke Kawata, Michiko S. Fujii, Junichi Baba","doi":"10.1093/mnrasl/slad190","DOIUrl":"https://doi.org/10.1093/mnrasl/slad190","url":null,"abstract":"Theoretical models of spiral arms suggest that the spiral arms provoke a vertical bulk motion in disc stars. By analysing the breathing motion, a coherent asymmetric vertical motion around the mid-plane of the Milky Way disc, with Gaia DR3, we found that a compressing breathing motion presents along the Local arm. On the other hand, with an N-body simulation of an isolated Milky Way-like disc galaxy, we found that the transient and dynamic spiral arms induce compressing breathing motions when the arms are in the growth phase, while the expanding breathing motion appears in the disruption phase. The observed clear alignment of the compressing breathing motion with the Local arm is similar to what is seen in the growth phase of the simulated spiral arms. Hence, we suggest that the Local arm’s compressing breathing motion can be explained by the Local arm being in the growth phase of a transient and dynamic spiral arm. We also identified the tentative signatures of the expanding breathing motion associated with the Perseus arm and also the Outer arm coinciding with the compressing breathing motion. This may infer that the Perseus and Outer arms are in the disruption and growth phases, respectively.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139324001","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 new, purely photometric method for determination of resonance locations in spiral galaxies 确定螺旋星系共振位置的一种新的纯光度法

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-01 DOI: 10.1093/mnrasl/slad141

Alexander A Marchuk, Aleksandr V Mosenkov, Ilia V Chugunov, Valeria S Kostiuk, Maria N Skryabina, Vladimir P Reshetnikov

{"title":"A new, purely photometric method for determination of resonance locations in spiral galaxies","authors":"Alexander A Marchuk, Aleksandr V Mosenkov, Ilia V Chugunov, Valeria S Kostiuk, Maria N Skryabina, Vladimir P Reshetnikov","doi":"10.1093/mnrasl/slad141","DOIUrl":"https://doi.org/10.1093/mnrasl/slad141","url":null,"abstract":"ABSTRACT The knowledge of the positions of the corotation resonance in spiral arms is a key way to estimate their pattern speed, which is a fundamental parameter determining the galaxy dynamics. Various methods for its estimation have been developed, but they all demonstrate certain limitations and a lack of agreement with each other. Here, we present a new method for estimating the corotation radius. This method takes into account the shape of the profile across the arm and its width and, thus, only photometric data is needed. The significance of the method is that it can potentially be used for the farthest galaxies with measurable spiral arms. We apply it to a sample of local galaxies from Savchenko et al.(2020) and compare the obtained corotation radii with those previously measured in the literature by other methods. Our results are in good agreement with the literature. We also apply the new method to distant galaxies from the COSMOS field. For the first time, corotation locations for galaxies with photometric redshifts up to z ∼ 0.9 are measured.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135458435","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 cautionary lesson from Gaia systematics: the mono-metallic globular cluster NGC 5904 盖亚星系的一个警示:单金属球状星团ngc5904

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-29 DOI: 10.1093/mnrasl/slad140

Paolo Bianchini, Alessandra Mastrobuono-Battisti

{"title":"A cautionary lesson from Gaia systematics: the mono-metallic globular cluster NGC 5904","authors":"Paolo Bianchini, Alessandra Mastrobuono-Battisti","doi":"10.1093/mnrasl/slad140","DOIUrl":"https://doi.org/10.1093/mnrasl/slad140","url":null,"abstract":"ABSTRACT The study of the chemistry of the stellar populations in globular clusters (GCs) is a fundamental task to unveil their formation in the high-redshift universe and to reconstruct the build-up of our Galaxy. Using metallicity estimates from BP/RP low-resolution Gaia DR3 spectra, a recent work presented the surprizing detection of two stellar populations with distinct metallicities in the stellar stream of the GC NGC 5904, otherwise considered a mono-metallic system. The presence of these two populations, with [Fe/H] ∼ −1.4 and [Fe/H] ∼ −2.0 dex, was taken as the evidence of a merger origin of the cluster. In this Letter, using the same data set complemented by new robust metallicity estimates, we carry out a detailed analysis of the metallicity distribution of stars belonging both to the cluster and to its stellar stream, explicitly focusing on the subtle effects of data systematics. We demonstrate that the population at [Fe/H] ∼ −2.0 dex is a data artefact due to error systematics, affecting especially faint stars. The new higher quality metallicity sample corroborates this finding, and it indicates the presence of only one population of stars with metallicity of [Fe/H] ∼ −1.3 dex, in agreement with previous literature studies. We, therefore, conclude that both NGC 5904 and its stellar stream are mono-metallic systems, and emphasize the need of carefully examining systematic effects in large and complex data.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135246968","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 new tidal scenario for double bar formation 双棒形成的新潮汐情景

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-29 DOI: 10.1093/mnrasl/slad175

M. Semczuk, E. Łokas, A. de Lorenzo-Cáceres, E. Athanassoula

引用次数: 0

Return of harrison-zeldovich spectrum in light of recent cosmological tensions 根据最近宇宙学的紧张局势，哈里森-泽尔多维奇光谱的回归

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-27 DOI: 10.1093/mnrasl/slad137

Jun-Qian Jiang, Gen Ye, Yun-Song Piao

引用次数: 7

Images of Betelgeuse with VLTI/MATISSE across the Great Dimming 参宿四与VLTI/MATISSE穿越大暗的图像

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-27 DOI: 10.1093/mnrasl/slad138

J Drevon, F Millour, P Cruzalèbes, C Paladini, P Scicluna, A Matter, A Chiavassa, M Montargès, E Cannon, F Allouche, K-H Hofmann, S Lagarde, B Lopez, A Meilland, R Petrov, S Robbe-Dubois, D Schertl, G Zins, P Ábrahám, P Berio, Th Henning, J Hron, J W Isbell, W Jaffe, L Labadie, J Varga, G Weigelt, J Woillez, R van Boekel, E Pantin, W C Danchi, A de Koter, V Gámez Rosas, M R Hogerheijde, J Leftley, P Stee, R Waters

{"title":"Images of Betelgeuse with VLTI/MATISSE across the Great Dimming","authors":"J Drevon, F Millour, P Cruzalèbes, C Paladini, P Scicluna, A Matter, A Chiavassa, M Montargès, E Cannon, F Allouche, K-H Hofmann, S Lagarde, B Lopez, A Meilland, R Petrov, S Robbe-Dubois, D Schertl, G Zins, P Ábrahám, P Berio, Th Henning, J Hron, J W Isbell, W Jaffe, L Labadie, J Varga, G Weigelt, J Woillez, R van Boekel, E Pantin, W C Danchi, A de Koter, V Gámez Rosas, M R Hogerheijde, J Leftley, P Stee, R Waters","doi":"10.1093/mnrasl/slad138","DOIUrl":"https://doi.org/10.1093/mnrasl/slad138","url":null,"abstract":"ABSTRACT From Nov. 2019 to May 2020, the red supergiant star Betelgeuse experienced an unprecedented drop of brightness in the visible domain called the Great Dimming event (GDE). Large atmospheric dust clouds and large photospheric convective features are suspected to be responsible for it. To better understand the dimming event, we used mid-infrared long-baseline spectro-interferometric measurements of Betelgeuse taken with the Very Large Telescope Interferometer/Multi AperTure mid-Infrared SpectroScopic Experiment (VLTI/MATISSE) instrument before (Dec. 2018), during (Feb. 2020), and after (Dec. 2020) the GDE. We present data in the 3.98–4.15 µm range to cover SiO spectral features molecules as well as adjacent continuum. We have employed geometrical models, image reconstruction, as well as radiative transfer models to monitor the spatial distribution of SiO over the stellar surface. We find a strongly inhomogeneous spatial distribution of SiO that appears to be looking very different between our observing epochs, indicative of a vigorous activity in the stellar atmosphere. The contrast of our images is small in the pseudo-continuum for all epochs, implying that our MATISSE observations support both cold spot and dust cloud model.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135579808","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

Palomar discovery and initial characterization of naked-eye long period comet C/2022 E3 (ZTF) 长周期彗星C/2022 E3 (ZTF)的帕洛马发现与初步表征

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-09-27 DOI: 10.1093/mnrasl/slad139

B T Bolin, F J Masci, D A Duev, J W Milburn, J D Neill, J N Purdum, C Avdellidou, Y-C Cheng, M Delbo, C Fremling, M Ghosal, Z-Y Lin, C M Lisse, A Mahabal, M Saki

{"title":"Palomar discovery and initial characterization of naked-eye long period comet C/2022 E3 (ZTF)","authors":"B T Bolin, F J Masci, D A Duev, J W Milburn, J D Neill, J N Purdum, C Avdellidou, Y-C Cheng, M Delbo, C Fremling, M Ghosal, Z-Y Lin, C M Lisse, A Mahabal, M Saki","doi":"10.1093/mnrasl/slad139","DOIUrl":"https://doi.org/10.1093/mnrasl/slad139","url":null,"abstract":"ABSTRACT Long-period comets are planetesimal remnants constraining the environment and volatiles of the protoplanetary disc. We report the discovery of hyperbolic long-period comet C/2022 E3 Zwicky Transient Facility (ZTF), which has a perihelion ∼1.11 au, an eccentricity ≳1 and an inclination ∼109°, from images taken with the Palomar 48-inch telescope during morning twilight on 2022 March 2. Additionally, we report the characterization of C/2022 E3 (ZTF) from observations taken with the Palomar 200-inch, the Palomar 60-inch, and the NASA Infrared Telescope Facility in early 2023 February to 2023 March when the comet passed within ∼0.28 au of the Earth and reached a visible magnitude of ∼5. We measure g–r = 0.70 ± 0.01, r–i = 0.20 ± 0.01, i–z = 0.06 ± 0.01, z–J = 0.90 ± 0.01, J–H = 0.38 ± 0.01, and H–K = 0.15 ± 0.01 colours for the comet from observations. We measure the A(0°)fρ (0.8 μm) in a 6500 km radius from the nucleus of 1483 ± 40 cm, and CN, C3, and C2 production of 5.43 ± 0.11 × 1025, 2.01 ± 0.04 × 1024, and 3.08 ± 0.5 × 1025 mol s−1, similar to other long-period comets. We additionally observe the appearance of jet-like structures at a scale of ∼4000 km in wide-field g-band images, which may be caused by the presence of CN gas in the near-nucleus coma.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"2010 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135579807","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