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The ram pressure stripped radio tails of galaxies in the Coma cluster

Chen, Hao; Sun, Ming; Yagi, Masafumi; Bravo-Alfaro, Hector; Brinks, Elias; Kenney, Jeffrey; Combes, Francoise; Sivanandam, Suresh; Jachym, Pavel; Fossati, Matteo; Gavazzi, Giuseppe; Boselli, Alessandro; Nulsen, Paul; Sarazin, Craig; Ge, Chong; Yoshida, Michitoshi; Roediger, Elke


Hao Chen

Ming Sun

Masafumi Yagi

Hector Bravo-Alfaro

Elias Brinks

Jeffrey Kenney

Francoise Combes

Suresh Sivanandam

Pavel Jachym

Matteo Fossati

Giuseppe Gavazzi

Alessandro Boselli

Paul Nulsen

Craig Sarazin

Chong Ge

Michitoshi Yoshida

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Dr Elke Roediger
Reader in Astrophysics, Director of the E.A. Milne Centre for Astrophysics


Previous studies have revealed a population of galaxies in galaxy clusters with ram pressure stripped (RPS) tails of gas and embedded young stars. We observed 1.4 GHz continuum and H I emission with the Very Large Array in its B-configuration in two fields of the Coma cluster to study the radio properties of RPS galaxies. The best continuum sensitivities in the two fields are 6 and 8 µJy per 4 arcsec beam, respectively, which are 4 and 3 times deeper than those previously published. Radio continuum tails are found in 10 (8 are new) out of 20 RPS galaxies, unambiguously revealing the presence of relativistic electrons and magnetic fields in the stripped tails. Our results also hint that the tail has a steeper spectrum than the galaxy. The 1.4 GHz continuum in the tails is enhanced relative to their H α emission by a factor of ∼7 compared to the main bodies of the RPS galaxies. The 1.4 GHz continuum of the RPS galaxies is also enhanced relative to their infrared emission by a factor of ∼2 compared to star-forming galaxies. The enhancement is likely related to ram pressure and turbulence in the tail. We furthermore present H I detections in three RPS galaxies and upper limits for the other RPS galaxies. The cold gas in D100’s stripped tail is dominated by molecular gas, which is likely a consequence of the high ambient pressure. No evidence of radio emission associated with ultra-diffuse galaxies is found in our data.


Chen, H., Sun, M., Yagi, M., Bravo-Alfaro, H., Brinks, E., Kenney, J., …Roediger, E. (2020). The ram pressure stripped radio tails of galaxies in the Coma cluster. Monthly notices of the Royal Astronomical Society, 496(4), 4654-4673.

Journal Article Type Article
Acceptance Date Jun 21, 2020
Online Publication Date Jul 2, 2020
Publication Date 2020-08
Deposit Date Sep 29, 2020
Publicly Available Date Sep 30, 2020
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 496
Issue 4
Pages 4654-4673
Keywords Galaxies: clusters: individual: Coma; Galaxies: interactions; Galaxies: ISM; Radio continuum: galaxies
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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