Volume 650, June 2021
|Number of page(s)||29|
|Published online||09 June 2021|
H I content in Coma cluster substructure⋆
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AV Groningen, The Netherlands
2 Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa
3 Netherlands Institute for Radio Astronomy (ASTRON), Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands
4 INAF – Osservatorio Astronomico di Cagliari, Via della Scienza 5, 09047 Selargius, CA, Italy
5 Korea Astronomy and Space Science, Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Korea
6 South African Radio Astronomy Observatory, 2 Fir Street, Black River Park, Observatory, Cape Town 7925, South Africa
7 Department of Physics and Electronics, Rhodes University, PO Box 94 Makhanda 6140, South Africa
8 Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
Accepted: 3 November 2020
Context. Galaxy clusters are some of largest structures in the universe. These very dense environments tend to be home to higher numbers of evolved galaxies than found in lower-density environments. It is well known that dense environments can influence the evolution of galaxies through the removal of the neutral gas (H I) reservoirs that fuel star formation. It is unclear which environment has a stronger effect: the local environment (i.e., the substructure within the cluster), or the cluster itself.
Aims. Using the new H I data from the Westerbork Coma Survey, we explore the average H I content of galaxies across the cluster comparing galaxies that reside in substructure to those that do not.
Methods. We applied the Dressler–Shectman test to our newly compiled redshift catalogue of the Coma cluster to search for substructure. With so few of the Coma galaxies directly detected in H I, we used the H I stacking technique to probe the average H I content below what can be directly detected.
Results. Using the Dressler–Shectman test, we find 15 substructures within the footprint of the Westerbork Coma Survey. We compare the average H I content for galaxies within substructure to those not in substructure. Using the H I stacking technique, we find that those Coma galaxies not detected in H I are more than 10–50 times more H I deficient than expected, which supports the scenario of an extremely efficient and rapid quenching mechanism. By studying the galaxies that are not directly detected in H I, we also find Coma to be more H I deficient than previously thought.
Key words: galaxies: clusters: general / galaxies: evolution / galaxies: groups: general / galaxies: general
Full Table C.1 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/650/A76
© ESO 2021
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