We study the relationship between the stability level of late-type galaxy disks and their star-formation activity using integral-field gaseous and stellar kinematic data. Specifically, we compare the two-component (gas+stars) stability parameter from Romeo & Wiegert (Q_RW), incorporating stellar kinematic data for the first time, and the star-formation rate estimated from 21cm continuum emission. We determine the stability level of each disk probabilistically using a Bayesian analysis of our data and a simple dynamical model. Our method incorporates the shape of the stellar velocity ellipsoid (SVE) and yields robust SVE measurements for over 90% of our sample. Averaging over this subsample, we find a meridional shape of sigma_z/sigma_R = 0.51^{+0.36}_{-0.25} for the SVE and, at 1.5 disk scale lengths, a stability parameter of Q_RW = 2.0 +/- 0.9. We also find that the disk-averaged star-formation-rate surface density (Sigma-dot_e,*) is correlated with the disk-averaged gas and stellar mass surface densities (Sigma_e,g and Sigma_e,*) and anti-correlated with Q_RW. We show that an anti-correlation between Sigma-dot_e,* and Q_RW can be predicted using empirical scaling relations, such that this outcome is consistent with well-established statistical properties of star-forming galaxies. Interestingly, Sigma-dot_e,* is not correlated with the gas-only or star-only Toomre parameters, demonstrating the merit of calculating a multi-component stability parameter when comparing to star-formation activity. Finally, our results are consistent with the Ostriker et al. model of self-regulated star-formation, which predicts Sigma-dot_e,*/Sigma_e,g/sqrt(Sigma_e,*). Based on this and other theoretical expectations, we discuss the possibility of a physical link between disk stability level and star-formation rate in light of our empirical results.
Mapping the Galactic disk with the LAMOST and Gaia Red clump sample: VIII: Mapping the kinematics of the Galactic disk using mono-age and mono-abundance stellar populations
The AGORA High-resolution Galaxy Simulations Comparison Project. VIII: Disk Formation and Evolution of Simulated Milky Way Mass Galaxy Progenitors at $1<z<5$
Seoul National University(首尔大学);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Osaka University(大阪大学);University of Tokyo(东京大学);University of Nevada Las Vegas(内华达大学拉斯维加斯分校);University of Connecticut(康涅狄格大学)
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). VIII. Modeling ram pressure stripping of diffuse gas in the Virgo cluster spiral galaxy NGC 4330
NGC 4330是室女座星系之一,其紫外线分布显示出尾结构。在HI和H $α$发射分布中也观察到相关的尾部结构。先前的动力学模型表明,星系正在接近星系团中心,因此正在经历越来越大的冲压压力剥离。最近的恒星星族拟合的深光学光谱与多波段测光导致恒星形成时,在银盘淬火的时间的测定。我们介绍了一个新版本的动力学模型,其中包括弥漫电离气体,旨在再现HI,H $α$,UV分布连同恒星形成的历史外无气体部分的银盘。50模拟的结果与五个不同的洛伦兹时间冲压压力分布和五个不同的延迟之间的模拟开始和峰值冲压压力。包括扩散气体剥离显着改变HI,UV,和H $α$发射分布。模拟与弥漫气体剥离自然导致垂直低表面密度细丝在顺风区的星系盘。在没有扩散气体剥离的模拟中,这些细丝出现的频率较低。扩散气体剥离的模拟导致更好的联合拟合的SED和光谱。最佳再现SED和光谱的模型快照的HI、NUV和H $α$形态充分不同以允许选择最佳拟合模型。我们的结论是,包括扩散气体剥离显着提高模型和观测之间的相似性。我们的首选模型得出未来达到峰值冲压压力的时间为1.4亿年。射电连续谱和弥漫H $α$尾的空间重合表明,两个气相被剥离在一起。
Early Planet Formation in Embedded Disks (eDisk). VIII. A Small Protostellar Disk around the Extremely Low-Mass and Young Class 0 Protostar, IRAS 15398-3359
PRODIGE -- envelope to disk with NOEMA VIII. Sulfur oxides trace a shock caused by a streamer in the inner envelope of a protostar
European Southern Observatory(欧洲南方天文台);Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理研究所);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Department of Physics and Astronomy, University of Rochester(罗切斯特大学物理与天文系);Taiwan Astronomical Research Alliance (TARA)(台湾天文研究联盟);Institute of Astronomy and Astrophysics, Academia Sinica(中央研究院天文及天文物理学研究所);Institut de Radioastronomie Millimétrique (IRAM)(毫米波射电天文研究所);IPAG, Université Grenoble Alpes, CNRS(格勒诺布尔阿尔卑斯大学CNRS IPAG实验室)
Virgo Filaments VIII: Characterizing the Structural Parameters of Virgo Galaxies with Machine Learning to Probe Environmental Quenching
University of Kansas(堪萨斯大学);Siena University(锡耶纳大学);Union College(联合学院);INAF- Osservatorio astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台);Steward Observatory, University of Arizona(亚利桑那大学斯图尔德天文台);INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天体物理学与空间科学观测站);Observatoire de Paris, LUX, Collège de France, CNRS, PSL University, Sorbonne University(巴黎天文台,法国学院,法国国家科学研究中心,巴黎文理研究大学,索邦大学);INAF – Osservatorio Astronomico di Trieste(意大利国家天体物理研究所的里雅斯特天文台);Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano-Bicocca(米兰比可卡大学G. Occhialini物理系);Laboratoire d’Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL)(洛桑联邦理工学院天体物理实验室)
Magnetic fields in Massive Star-Forming Regions (MagMaR). VIII. Magnetic field overrun by gravity in GGD 27's accretion streamers
Institut de Ciències de l’Espai (ICE-CSIC)(太空科学研究所);Instituto Argentino de Radioastronomía(阿根廷无线电天文学研究所);Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata(拉普拉塔国立大学天文与地球物理科学学院);Academia Sinica Institute of Astronomy and Astrophysics(中央研究院天文及天文物理研究所);Institut d’Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚空间研究学院);Department of Astronomy, School of Science, The University of Tokyo(东京大学理学部天文学系);Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México(墨西哥国立自治大学射电天文学与天体物理研究所);Joint ALMA Observatory(ALMA联合观测站);National Radio Astronomy Observatory(美国国家射电天文台);Max Planck Institute for Astronomy(马克斯·普朗克天体物理学研究所)
ACES VIII: A Survey of Compact, High-Velocity Features Observed in CS(2-1)
University of Connecticut(康涅狄格大学);University of Florida(佛罗里达大学);University of Kansas(堪萨斯大学);Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS(中国科学院国家天文台南美天体物理中心);Instituto de Astronomía, Universidad Católica del Norte(北天主教大学天文学研究所)
Isochrone Fitting of Galactic Globular Clusters -- VIII. Homogeneous estimates of parameters for 27 clusters
Central (Pulkovo) Astronomical Observatory, Russian Academy of Sciences(俄罗斯科学院中央(普尔科沃)天文台);Institute for Nuclear Research, Russian Academy of Sciences(俄罗斯科学院核物理研究所);Saint Petersburg State University(圣彼得堡国立大学);Departamento de Astronomia, Instituto de Física, UFRGS(阿雷格里港联邦大学天文学系、物理学院);Faculty of Physics, Moscow State University(莫斯科国立大学物理系)
On the Use of Field RR Lyrae as Galactic Probes -- VIII. Early Formation of the Galactic Spheroid
ASI - Space Science Data Center(意大利航天局空间科学数据中心);Florida State University(佛罗里达州立大学);NSF NOIRLab(美国国家科学基金会NOIR天文台实验室);Vanderbilt University(范德堡大学);Space Telescope Science Institute(太空望远镜科学研究所);Dartmouth College(达特茅斯学院);University of Hawai'i at Manoa(夏威夷大学马诺阿分校);Saint Martin’s University(圣马丁大学);The University of Tokyo(东京大学);Liverpool John Moores University(利物浦约翰摩尔斯大学);National Astronomical Observatory of Japan(日本国立天文台);Cerro Tololo Inter-American Observatory/NSF NOIRLab(塞罗托洛洛美洲际天文台/美国国家科学基金会NOIR天文台实验室);Millennium Institute of Astrophysics(天体物理学千年研究所)