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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29237
Title: Deep and narrow CO absorption revealing molecular clouds in the Hydra-A brightest cluster galaxy
Authors: Rose, Tom
Edge, A. C.
Combes, F.
GASPARI, MASSIMO 
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.
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 485
Issue: 1
First Page: 229
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 and are most likely moving along stable, low ellipticity orbits. The identified clouds form part of a ∼10^9 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 N_{CO}=2^{+3}_{-1}× 10^{17} cm^-2 and N_H2 = 7^{+10}_{-4}× 10^{20} cm^-2.
URI: http://hdl.handle.net/20.500.12386/29237
URL: https://academic.oup.com/mnras/article/485/1/229/5315802
ISSN: 0035-8711
DOI: 10.1093/mnras/stz406
Bibcode ADS: 2019MNRAS.485..229R
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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