The Westerbork Coma Survey. A blind, deep, high-resolution H I survey of the Coma cluster

DOI: 
10.1051/0004-6361/202142614
Publication date: 
08/03/2022
Main author: 
Molnár, D. Cs.
IAA authors: 
Hess, K. M.
Authors: 
Molnár, D. Cs.;Serra, P.;van der Hulst, T.;Jarrett, T. H.;Boselli, A.;Cortese, L.;Healy, J.;de Blok, E.;Cappellari, M.;Hess, K. M.;Józsa, G. I. G.;McDermid, R. M.;Oosterloo, T. A.;Verheijen, M. A. W.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
659
Pages: 
A94
Abstract: 
We present the blind Westerbork Coma Survey probing the H I content of the Coma galaxy cluster with the Westerbork Synthesis Radio Telescope. The survey covers the inner ∼1 Mpc around the cluster centre, extending out to 1.5 Mpc towards the south-western NGC 4839 group. The survey probes the atomic gas in the entire Coma volume down to a sensitivity of ∼10<SUP>19</SUP> cm<SUP>−2</SUP> and 10<SUP>8</SUP> M<SUB>⊙</SUB>. Combining automated source finding with source extraction at optical redshifts and visual verification, we obtained 40 H I detections of which 24 are new. Over half of the sample displays perturbed H I morphologies indicative of an ongoing interaction with the cluster environment. With the use of ancillary UV and mid-IR, data we measured their stellar masses and star formation rates and compared the H I properties to a set of field galaxies spanning a similar stellar mass and star formation rate range. We find that ∼75% of H I-selected Coma galaxies have simultaneously enhanced star formation rates (by ∼0.2 dex) and are H I deficient (by ∼0.5 dex) compared to field galaxies of the same stellar mass. According to our toy model, the simultaneous H I deficiency and enhanced star formation activity can be attributed to either H I stripping of already highly star forming galaxies on a very short timescale, while their H<SUB>2</SUB> content remains largely unaffected, or to H I stripping coupled to a temporary boost of the H I-to-H<SUB>2</SUB> conversion, causing a brief starburst phase triggered by ram pressure before eventually quenching the galaxy. <P />The table containing the estimated physical properties of our H I-detected Coma galaxies and full Table A.1 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/659/A94">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/659/A94</A>
Database: 
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022A&A...659A..94M/abstract
ADS Bibcode: 
2022A&A...659A..94M
Keywords: 
galaxies: clusters: general;galaxies: interactions;galaxies: evolution;radio lines: galaxies;galaxies: star formation;Astrophysics - Astrophysics of Galaxies