Dr Russell Smith russell.smith@durham.ac.uk
Assistant Professor
An extended cold gas absorber in a central cluster galaxy
Smith, Russell J.; Edge, Alastair C.
Authors
Professor Alastair Edge alastair.edge@durham.ac.uk
Professor
Abstract
We present the serendipitous discovery of an extended cold gas structure projected close to the brightest cluster galaxy (BCG) of the z = 0.045 cluster Abell 3716, from archival integral field spectroscopy. The gas is revealed through narrow Na D line absorption, seen against the stellar light of the BCG, which can be traced for ∼25 kpc, with a width of 2–4 kpc. The gas is offset to higher velocity than the BCG (by ∼100 km s−1), showing that it is infalling rather than outflowing; the intrinsic linewidth is ∼80 km s−1 (FWHM). Very weak H α line emission is detected from the structure, and a weak dust absorption feature is suggested from optical imaging, but no stellar counterpart has been identified. We discuss some possible interpretations for the absorber: as a projected low-surface-brightness galaxy, as a stream of gas that was stripped from an infalling cluster galaxy or as a ‘retired’ cool-core nebula filament.
Citation
Smith, R. J., & Edge, A. C. (2017). An extended cold gas absorber in a central cluster galaxy. Monthly Notices of the Royal Astronomical Society: Letters, 471(1), L66-L70. https://doi.org/10.1093/mnrasl/slx107
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 23, 2017 |
Online Publication Date | Jul 6, 2017 |
Publication Date | Oct 11, 2017 |
Deposit Date | Jul 27, 2017 |
Publicly Available Date | Aug 2, 2017 |
Journal | Monthly Notices of the Royal Astronomical Society: Letters |
Electronic ISSN | 1745-3933 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 471 |
Issue | 1 |
Pages | L66-L70 |
DOI | https://doi.org/10.1093/mnrasl/slx107 |
Related Public URLs | https://arxiv.org/abs/1706.08533 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters. © 2017. The Authors.
Published by Oxford University Press on behalf of the Royal Astronomical Society.
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