T. Rose
Deep and narrow CO absorption revealing molecular clouds in the Hydra-A brightest cluster galaxy
Rose, T.; Edge, A.C.; Combes, F.; Gaspari, M.; Hamer, S.; Nesvadba, N.; Russell, H.; Tremblay, G.R.; Baum, S.A.; O’Dea, C.; Peck, A.B.; Sarazin, C.; Vantyghem, A.; Bremer, M.; Donahue, M.; Fabian, A.C.; Ferland, G.; McNamara, B.R.; Mittal, R.; Oonk, J.B.R.; Salomé, P.; Swinbank, A.M.; Voit, M.
Authors
Professor Alastair Edge alastair.edge@durham.ac.uk
Professor
F. Combes
M. Gaspari
S. Hamer
N. Nesvadba
H. Russell
G.R. Tremblay
S.A. Baum
C. O’Dea
A.B. Peck
C. Sarazin
A. Vantyghem
M. Bremer
M. Donahue
A.C. Fabian
G. Ferland
B.R. McNamara
R. Mittal
J.B.R. Oonk
P. Salomé
Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor
M. Voit
Abstract
Active galactic nuclei play a crucial role in the accretion and ejection of gas in galaxies. Although their outflows are well studied, finding direct evidence of accretion has proved very difficult and has so far been done for very few sources. A promising way to study the significance of cold accretion is by observing the absorption of an active galactic nucleus’s extremely bright radio emission by the cold gas lying along the line-of-sight. As such, we present ALMA CO(1-0) and CO(2-1) observations of the Hydra-A brightest cluster galaxy (z=0.054) which reveal the existence of cold, molecular gas clouds along the line-of-sight to the galaxy’s extremely bright and compact mm-continuum source. They have apparent motions relative to the central supermassive black hole of between -43 and -4 km s−1 and are most likely moving along stable, low ellipticity orbits. The identified clouds form part of a ∼109 M⊙, approximately edge-on disc of cold molecular gas. With peak CO(2-1) optical depths of τ=0.88 +0.06−0.06, they include the narrowest and by far the deepest absorption of this type which has been observed to date in a brightest cluster galaxy. By comparing the relative strengths of the lines for the most strongly absorbing region, we are able to estimate a gas temperature of 42+25−11 K and line-of-sight column densities of NCO=2+3−1×1017cm−2 and NH2=7+10−4×1020cm−2.
Citation
Rose, T., Edge, A., Combes, F., Gaspari, M., Hamer, S., Nesvadba, N., …Voit, M. (2019). Deep and narrow CO absorption revealing molecular clouds in the Hydra-A brightest cluster galaxy. Monthly Notices of the Royal Astronomical Society, 485(1), 229-238. https://doi.org/10.1093/mnras/stz406
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 5, 2019 |
Online Publication Date | Feb 11, 2019 |
Publication Date | May 1, 2019 |
Deposit Date | Feb 19, 2019 |
Publicly Available Date | Feb 19, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 485 |
Issue | 1 |
Pages | 229-238 |
DOI | https://doi.org/10.1093/mnras/stz406 |
Public URL | https://durham-repository.worktribe.com/output/1302806 |
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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
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