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 language | English |
---|---|
Pages (from-to) | 4128-4141 |
Number of pages | 14 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 519 |
Issue number | 3 |
DOIs | |
Publication status | Published - 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