MeerKAT view of Hickson Compact Groups II. Hi deficiency in the cores and surrounding regions
Artikel i vetenskaplig tidskrift, 2025
Context. Hickson compact groups (HCGs) offer an ideal environment for investigating galaxy transformation as a result of interactions. It has been established that the evolutionary sequence of HCGs is marked by an intermediate stage characterised by a substantial amount of Hi in their intragroup medium (IGrM) in the form of tidal tails and bridges (phase 2), rapidly followed by a final stage in which no IGrM gas is found and i which their member galaxies are highly Hi deficient (phase 3). Aims. Despite numerous single-dish and interferometric Hi studies on the HCGs, a clear Hi picture of the groups within their large-scale environment still remains to be uncovered. Taking advantage of MeerKAT’s high column density sensitivity and large field of view, we aim to investigate the rapid transformation of HCGs from the intermediate to late phases, and establish a picture of their gas content variations in the context of their large-scale environments. Methods. We performed MeerKAT observations of six HCGs that were selected to represent the intermediate and late phases of the proposed evolutionary sequence. Combining the Hi observations with data from recent wide-field optical surveys, we evaluated the Hi deficiencies of galaxies in a ∼300 radius of the HCGs. Results. We find that galaxies surrounding both phases exhibit similar distributions in their gas content. Similarly, galaxies making up the cores of phase 2 HCGs are comparable to their neighbours in terms of Hi deficiencies. However, phase 3 groups are over an order of magnitude more deficient than their surroundings, supporting previous findings that late-phase HCG galaxies are more evolved than their large-scale environments.
intergalactic medium
galaxies: interactions
galaxies: evolution
Författare
A. Sorgho
Consejo Superior de Investigaciones Científicas (CSIC)
L. Verdes-Montenegro
Consejo Superior de Investigaciones Científicas (CSIC)
R. Ianjamasimanana
Consejo Superior de Investigaciones Científicas (CSIC)
Kelley Michelle Hess
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Consejo Superior de Investigaciones Científicas (CSIC)
Netherlands Institute for Radio Astronomy (ASTRON)
M. G. Jones
University of Arizona
M. Korsaga
Consejo Superior de Investigaciones Científicas (CSIC)
Université Joseph Ki-Zerbo
J. Wang
Beijing University of Technology
Xuchen Lin
Beijing University of Technology
J. M. Solanes
Universitat de Barcelona
M. E. Cluver
Swinburne University of Technology
J. M. Cannon
Macalester College
A. Bosma
Laboratoire d'Astrophysique de Marseille
E. Athanassoula
Laboratoire d'Astrophysique de Marseille
A. del Olmo
Consejo Superior de Investigaciones Científicas (CSIC)
J. Perea
Consejo Superior de Investigaciones Científicas (CSIC)
J. Moldon
Consejo Superior de Investigaciones Científicas (CSIC)
T. Wiegert
Consejo Superior de Investigaciones Científicas (CSIC)
S. Sánchez-Expósito
Consejo Superior de Investigaciones Científicas (CSIC)
J. Garrido
Consejo Superior de Investigaciones Científicas (CSIC)
R. García-Benito
Consejo Superior de Investigaciones Científicas (CSIC)
G. I.G. Józsa
Max-Planck-Gesellschaft
Rhodes University
S. Borthakur
Arizona State University
T. H. Jarrett
University of the Western Cape
University of Cape Town
B. Namumba
Consejo Superior de Investigaciones Científicas (CSIC)
E. Pérez
Consejo Superior de Investigaciones Científicas (CSIC)
J. Román
Universidad Complutense de Madrid
O. Smirnov
Rhodes University
South African Radio Astronomy Observatory (SARAO)
Istituto nazionale di astrofisica (INAF)
Min S. Yun
University of Massachusetts
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 696 A177Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202452995
Relaterade dataset
HCG deficiency analysis: first version of the code [dataset]
URI: https://zenodo.org/records/14965528