Planetary Nebulae and their parent stellar populations. Tracing the mass assembly of M87 and Intracluster light in the Virgo cluster core
Magda Arnaboldi, Alessia Longobardi, Ortwin Gerhard
备注：
8 pages, 3 figures, To appear in the proceedings of the IAU Symposium 317 "The General Assembly of Galaxy Halos: Structure, Origin and Evolution'', A. Bragaglia, M. Arnaboldi, M. Rejkuba & D. Romano, eds
The diffuse extended outer regions of galaxies are hard to study because they are faint, with typical surface brightness of 1% of the dark night sky. We can tackle this problem by using resolved star tracers which remain visible at large distances from the galaxy centres. This article describes the use of Planetary Nebulae as tracers and the calibration of their properties as indicators of the star formation history, mean age and metallicity of the parent stars in the Milky Way and Local Group galaxies . We then report on the results from a deep, extended, planetary nebulae survey in a 0.5 sqdeg region centred on the brightest cluster galaxy NGC 4486 (M87) in the Virgo cluster core, carried out with SuprimeCam@Subaru and FLAMES-GIRAFFE@VLT. Two PN populations are identified out to 150 kpc distance from the centre of M87. One population is associated with the M87 halo and the second one with the intracluster light in the Virgo cluster core. They have different line-of-sight velocity and spatial distributions, as well as different planetary nebulae specific frequencies and luminosity functions. The intracluster planetary nebulae in the surveyed region correspond to a luminosity of four times the luminosity of the Large Magellanic Cloud. The M87 halo planetary nebulae trace an older, more metal-rich, parent stellar population. A substructure detected in the projected phase-space of the line-of-sight velocity vs. major axis distance for the M87 halo planetary nebulae provides evidence for the recent accretion event of a satellite galaxy with luminosity twice that of M33. The satellite stars were tidally stripped about 1 Gyr ago, and reached apocenter at a major axis distance of 60-90 kpc from the centre of M87. The M87 halo is still growing significantly at the distances where the substructure is detected.
To the Edge of M87 and Beyond: Spectroscopy of Intracluster Globular Clusters and Ultra Compact Dwarfs in the Virgo Cluster
本文介绍了对室女星系团中的球状星团（GCs）进行宽场光谱观测的结果。我们利用多镜望远镜的Hectospec获得了201颗GC和55颗超紧矮星的光谱，并推导了它们的径向速度。利用3D GMM方法对空间和径向速度分布进行了检验，确定了46个与室女座星系无关的真正的团内GC，它们位于距M87中心200 kpc $\lesssim$ R $\lesssim$ 500 kpc处。这些IGC的径向速度分布显示出两个峰值，一个在$v_{\rm r}$ = 1023 km s $^{-1}$处与室女座主体有关，另一个在$v_{\rm r}$ = 36 km s $^{-1}$处与坠落结构有关。室女座主体星系的速度色散为$σ_{\rm{GC}} \sim$ 314 km s $^{-1}$，与M87星系的速度色散曲线平滑相连，但远低于同一观测场中矮星系的速度色散曲线$σ_{\rm{dwarf}} \sim$ 608 km s $^{-1}$。UCD更集中在大质量星系M87、M86和M84上。UCD系统的径向速度色散比矮星系小得多。我们的研究结果证实了大规模分布的室女座IGCs由以前的光度调查。确认的IGCs的颜色分布显示出与M87 GCs相似的双峰性。这表明大多数IGC是从矮星系剥离出来的，有些是从室女座的大质量星系剥离出来的。
Extragalactic planetary nebulae -- tracers of kinematics and stellar populations out to 100 Mpc
University of Turku（图尔库大学）；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）；University of Hertfordshire（赫特福德大学）；University of Oxford（牛津大学）；Leibniz-Institut für Astrophysik Potsdam (AIP)（波茨坦莱布尼茨天体物理研究所）；Universität Potsdam（波茨坦大学）；Ludwig-Maximilians-Universität München（慕尼黑大学）
MAUVE-MUSE: Ionization and Kinematic Signatures of Environmental Effects on Virgo Cluster Disks
National Research Council of Canada, Herzberg Astronomy and Astrophysics Research Centre（加拿大国家研究委员会赫茨伯格天体物理学研究中心）；University of Victoria（维多利亚大学）；International Centre for Radio Astronomy Research, The University of Western Australia（西澳大利亚大学国际射电天文研究中心）；ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)（ARC三维全天空天体物理学卓越中心）；European Southern Observatory（欧洲南方天文台）；School of Astronomy, Institute for research in fundamental sciences (IPM)（基础科学研究院天文学院）
Gas motion in the intracluster medium of the Virgo cluster replica
Université Paris-Saclay（巴黎萨克雷大学）；CNRS, Institut d’Astrophysique Spatiale（法国国家科学研究中心，空间天体物理研究所）；INAF, Osservatorio di Astrofisica e Scienza dello Spazio（意大利国家天体物理研究所，空间天体物理学与天文台）；INFN, Sezione di Bologna（意大利国家核物理研究所，博洛尼部分部）；Université de Lille（里尔大学）；Centrale Lille（里尔中央理工学院）
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XIX. The discovery of a spectacular 230 kpc Halpha tail following NGC 4569 in the Virgo cluster
University of Alabama in Huntsville（亨茨维尔阿拉巴马大学）；Canada-France-Hawaii Telescope（加拿大-法国-夏威夷望远镜）；INAF - Osservatorio Astronomico di Cagliari（意大利国家天体物理研究所-卡利亚里天文台）；Guizhou Normal University（贵州师范大学）；University of Virginia（弗吉尼亚大学）；INAF-Osservatorio Astronomico di Brera（意大利国家天体物理研究所-布雷拉天文台）；Zhejiang Laboratory（浙江实验室）；University of Vienna（维也纳大学）；SISSA – International School for Advanced Studies（国际高等研究院）；Laboratoire d'Astrophysique de Bordeaux, Univ. Bordeaux, CNRS（波尔多天体物理实验室，波尔多大学，法国国家科学研究中心）；National Research Council of Canada, Herzberg Astronomy and Astrophysics（加拿大国家研究委员会，赫茨伯格天文学与天体物理学研究所）
High-resolution X-ray spectroscopy with XRISM/Resolve reveals super-Solar abundance ratios in Virgo/M87
SRON, Space Research Organisation Netherlands（荷兰空间研究所）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo（东京大学宇宙物质起源宇宙论前沿研究机构）；NASA / Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；Department of Astronomy, University of Maryland（马里兰大学天文学系）；Center for Research and Exploration in Space Science and Technology, NASA / GSFC (CRESST II)（NASA/GSFC空间科学与技术研究探索中心）；Univ Toulouse, CNES, CNRS, IRAP（图卢兹大学、法国国家空间研究中心、法国国家科学研究中心、图卢兹天体物理研究所）；Center for Space Sciences and Technology, University of Maryland, Baltimore County (UMBC)（马里兰大学巴尔的摩县分校空间科学与技术中心）；School of Physics & Astronomy, University of Nottingham（诺丁汉大学物理与天文学院）
Widefield Arecibo Virgo Extragalactic Survey: II. Characterizing the HI properties and environment of the WAVES South region
Astronomical Institute of Charles University（查理大学天文研究所）；Astronomical Institute of the Czech Academy of Sciences（捷克科学院天文研究所）；National Radio Astronomy Observatory（国家射电天文观测台）
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).XI. Two dimensional H$α$ kinematics of the edge-on ram pressure stripped galaxy NGC 4330
From Observations to Simulations: A Neural-Network Approach to Intracluster Medium Kinematics
Max-Planck-Institut für extraterrestrische Physik（马克斯·普朗克地外物理研究所）；Harvard-Smithsonian Center for Astrophysics（哈佛-史密森天体物理中心）；Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK（剑桥大学天文研究所）；Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University（北京师范大学前沿天文与天体物理研究所）；INAF - IASF Palermo（意大利国家天体物理研究所巴勒莫分部）；Department of Physics and Astronomy, University of Alabama in Huntsville（阿拉巴马大学亨茨维尔分校物理与天文学系）
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) XX. Star formation in the tidal tail of NGC 4254
Aix Marseille Univ, CNRS, CNES, LAM（艾克斯马赛大学）；INAF - Osservatorio Astronomico di Cagliari（意大利国家天体物理研究所卡利亚里天文台）；Como Lake Center for Astrophysiscs, DiSAT, Università degli Studi dell’Insubria（因苏布里亚大学）；INAF - Osservatorio Astronomico di Bologna（意大利国家天体物理研究所博洛尼亚天文台）；European Southern Observatory（欧洲南方天文台）；INAF - Osservatorio Astronomico di Capodimonte（意大利国家天体物理研究所卡波迪蒙特天文台）；Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, Observatoire de Paris（巴黎高等师范学院）；Department of Astrophysics, University of Vienna（维也纳大学）；Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange（蔚蓝海岸大学）；Università di Milano-Bicocca（米兰比可卡大学）
ViCTORIA project: A pilot study of the M49 region in the Virgo cluster in polarisation
Hamburger Sternwarte, Universität Hamburg（汉堡天文台，汉堡大学）；INAF - Istituto di Radioastronomia（意大利国家天体物理研究所射电天文研究所）；Dipartimento di Fisica e Astronomia, Università di Bologna（博洛尼亚大学物理与天文系）；ASTRON, Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；INAF - Osservatorio Astronomico di Cagliari（意大利国家天体物理研究所卡利亚里天文台）；Aix Marseille Univ, CNRS, CNES, LAM（艾克斯-马赛大学，法国国家科学研究中心，法国国家空间研究中心，拉格朗日实验室）；Department of Astronomy and Astrophysics, University of Chicago（芝加哥大学天文学与天体物理学系）
Cold gas formation triggered by active galactic nuclei jet feedback in galaxy cluster cores
Università di Bologna（博洛尼亚大学）；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文与空间科学观测站）；University of Hertfordshire（赫特福德大学）；University of Cambridge（剑桥大学）；Istituto di Radio Astronomia, INAF（意大利国家天体物理研究所射电天文研究所）；University of California Observatories/Lick Observatory（加州大学天文台/利克天文台）
