Gas condensation in brightest group galaxies unveiled with MUSE. Morphology and kinematics of the ionized gas
In: ISSN: 0004-6361, 2022
Online
academicJournal
Zugriff:
International audience ; The origin of the cold gas in central galaxies in groups is still a matter of debate. We present Multi-Unit Spectroscopic Explorer (MUSE) observations of 18 optically selected local (z ≤ 0.017) brightest group galaxies (BGGs) to study the kinematics and distribution of the optical emission-line gas. MUSE observations reveal a distribution of gas morphologies including ten complex networks of filaments extending up to ∼10 kpc to two compact (< 3 kpc) and five extended (> 5 kpc) disk-dominated structures. Some rotating disks show rings and elongated structures arising from the central disk. The kinematics of the stellar component is mainly rotation-dominated, which is very different from the disturbed kinematics and distribution found in the filamentary sources. The ionized gas is kinematically decoupled from the stellar component for most systems, suggesting an external origin for the gas. We also find that the Hα luminosity correlates with the cold molecular gas mass. By exploring the thermodynamical properties of the X-ray atmospheres, we find that the filamentary structures and compact disks are found in systems with small central entropy values, K, and t cool /t eddy ratios. This suggests that, similar to brightest cluster galaxies (BCGs) in cool core clusters, the ionized filaments and the cold gas associated to them are likely formed from hot halo gas condensations via thermal instabilities, which is consistent with the chaotic cold accretion simulations (as shown via the C ratio, Ta t , and k plot). We note that the presence of gaseous rotating disks is more frequent than in BCGs. An explanation for the origin of the gas in those objects is a contribution to gas fueling by wet mergers or group satellites, as qualitatively hinted at by some sources of the present sample. Nonetheless, we discuss the possibility that some extended disks could also be a transition stage in an evolutionary sequence including filaments, extended disks, and compact disks, as described by hot gas ...
Titel: |
Gas condensation in brightest group galaxies unveiled with MUSE. Morphology and kinematics of the ionized gas
|
---|---|
Autor/in / Beteiligte Person: | Olivares, V. ; Salomé, P. ; Hamer, S. L. ; Combes, F. ; Gaspari, M. ; Kolokythas, K. ; O'Sullivan, E. ; Beckmann, R. S. ; Babul, A. ; Polles, F. L. ; Lehnert, M. ; Loubser, S. I. ; Donahue, M. ; Gendron-Marsolais, M. L. ; Lagos, P. ; Pineau Des Forets, G. ; Godard, B. ; Rose, T. ; Tremblay, G. ; Ferland, G. ; Guillard, P. ; Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA) ; École normale supérieure - Paris (ENS-PSL) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP) ; Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS) ; Collège de France - Chaire Galaxies et cosmologie ; Collège de France (CdF (institution)) ; Institut d'Astrophysique de Paris (IAP) ; Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Centre de Recherche Astrophysique de Lyon (CRAL) ; École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) ; ANR-16-CE31-0011,LYRICS,Le cycle du gaz autour des galaxies : origine et conditions physiques des flots de gaz froid(2016) |
Link: | |
Zeitschrift: | ISSN: 0004-6361, 2022 |
Veröffentlichung: | HAL CCSD ; EDP Sciences, 2022 |
Medientyp: | academicJournal |
DOI: | 10.1051/0004-6361/202142475 |
Schlagwort: |
|
Sonstiges: |
|