H I absorption associated with Norma's brightest cluster galaxy

M. Saraf, O. I. Wong, L. Cortese, Bärbel S. Koribalski

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

ESO 137-G006 is the brightest cluster galaxy (BCG) of the cool-core and dynamically young Norma cluster. We discover an atomic hydrogen (H i) absorption line associated with this BCG using the Australia Telescope Compact Array. We estimate a gas column density of $\approx (1.3 \pm 0.2) \times 10^{20}\, T_{\rm {spin}}$ atoms cm-2 with spin temperature, Tspin ≤ 194 K, consistent with the H i properties of other early-Type galaxies and cool-core cluster BCGs. The relationship between the presence of cold gas and a cluster cooling flow is unclear. Our results support the scenario that ESO 137-G006 may be a recent arrival to the cluster centre and not the original BCG. This scenario is consistent with the observed spatial alignment of the BCG's wide-Angle tail radio lobes with Norma's X-ray sub-cluster and the significant line-of-sight velocity offset between the mean velocity of Norma and that of the BCG.

Original languageEnglish
Pages (from-to)4128-4141
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume519
Issue number3
DOIs
Publication statusPublished - 1 Mar 2023

Bibliographical note

Publisher Copyright:
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

Keywords

  • galaxies: elliptical and lenticular, cD
  • radio lines: galaxies
  • galaxies: clusters: individual: Norma cluster (ACO 3627)
  • galaxies: individual: ESO 137-G006

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