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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28086
Title: GASP - XII. The variety of physical processes occurring in a single galaxy group in formation
Authors: Vulcani, Benedetta 
POGGIANTI, Bianca Maria 
Jaffé, Yara L.
MORETTI, ALESSIA 
Fritz, Jacopo
GULLIEUSZIK, MARCO 
BETTONI, Daniela 
FASANO, Giovanni
Tonnesen, Stephanie
McGee, Sean
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 480
Issue: 3
First Page: 3152
Abstract: GAs Stripping Phenomena in galaxies with MUSE is a program aimed at studying gas removal processes in nearby galaxies in different environments. We present the study of four galaxies that are part of the same group (z = 0.06359) and highlight the multitude of mechanisms affecting the spatially resolved properties of the group members. One galaxy is passive and shows a regular stellar kinematics. The analysis of its star formation history indicates that the quenching process lasted for a few Gyr and that the star formation declined throughout the disc in a similar way, consistent with strangulation. Another galaxy is characterized by a two-component stellar disc with an extended gas disc that formed a few 10<SUP>8</SUP> yr ago, most likely as a consequence of gas accretion. The third member is a spiral galaxy at the edges of the group but embedded in a filament. We hypothesize that the compression exerted by the sparse intergalactic medium on the dense circumgalactic gas switches on star formation in a number of clouds surrounding the galaxy ('cosmic web enhancement'). Alternatively, also ram pressure stripping might be effective. Finally, the fourth galaxy is a spiral with a truncated ionized gas disc and an undisturbed stellar kinematics. An analytical model of the galaxy's restoring pressure, and its location and velocity within the cluster, suggests ram pressure is the most likely physical mechanism in action. This is the first optical evidence for stripping in groups.
URI: http://hdl.handle.net/20.500.12386/28086
URL: https://academic.oup.com/mnras/article/480/3/3152/5067880
ISSN: 0035-8711
DOI: 10.1093/mnras/sty2095
Bibcode ADS: 2018MNRAS.480.3152V
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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