The Westerbork Coma Survey. A blind, deep, high-resolution H I survey of the Coma cluster - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2022

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

D. Cs. Molnár
  • Function : Author
P. Serra
  • Function : Author
T. van Der Hulst
  • Function : Author
T. H. Jarrett
  • Function : Author
A. Boselli
L. Cortese
  • Function : Author
J. Healy
  • Function : Author
E. de Blok
  • Function : Author
M. Cappellari
  • Function : Author
K. M. Hess
  • Function : Author
G. I. G. Józsa
  • Function : Author
R. M. Mcdermid
  • Function : Author
T. A. Oosterloo
  • Function : Author
M. A. W. Verheijen
  • Function : Author


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 ( or via

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Dates and versions

insu-03667463 , version 1 (13-05-2022)



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 and Astrophysics - A&A, 2022, 659, ⟨10.1051/0004-6361/202142614⟩. ⟨insu-03667463⟩
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