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

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 ∼1019 cm−2 and 108 M. 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 H2 content remains largely unaffected, or to H I stripping coupled to a temporary boost of the H I-to-H2 conversion, causing a brief starburst phase triggered by ram pressure before eventually quenching the galaxy.

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 cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/659/A94

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Submitted on : Friday, May 13, 2022 - 3:13:52 PM
Last modification on : Sunday, May 15, 2022 - 3:03:25 AM

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D. Cs. Molnár, P. Serra, T. van der Hulst, T. H. Jarrett, A. Boselli, et al.. The Westerbork Coma Survey. A blind, deep, high-resolution H I survey of the Coma cluster. Astronomy & Astrophysics, 2022, 659, ⟨10.1051/0004-6361/202142614⟩. ⟨insu-03667463⟩

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