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Title: XMM-Newton first-light observations of the Hickson galaxy group 16
Authors: Turner, M. J. L.
Reeves, J. N.
Bennie, P. J.
Dos Santos S
Griffiths, R. G.
Holland, A. D.
Sembay, S.
Short, A.
Ward, M.
Ponman, T. J.
Butler, I.
Goodall, C. V.
Arnaud, M.
Ferrando, P.
Lortholary, M.
Pigot, C.
Rothenflug, R.
Sauvageot, J.
Schmitt, D.
Vigroux, L.
Barbera, M.
Boer, M.
Briel, U.
Reppin, C.
Strüder, L.
Trümper, J.
Clavel, J.
Dhez, P.
Cordova, F.
Ghizzardi, S.
Lagostina, A.
La Palombara N
Molendi, S.
Vercellone, S.
Villa, G.
Hochedez, J. F.
Salvetat, P.
Jansen, F.
Kendziorra, E.
Laine, R.
Mason, K. O.
Priedhorsky, W.
Trifoglio, M.
First Published: Jan-2001
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2001, 365 (1)
Abstract: This paper presents the XMM-Newton first-light observations of the Hickson-16 compact group of galaxies. Groups are possibly the oldest large-scale structures in the Universe, pre-dating clusters of galaxies, and are highly evolved. This group of small galaxies, at a redshift of 0.0132 (or 80 Mpc) is exceptional in the having the highest concentration of starburst or AGN activity in the nearby Universe. So it is a veritable laboratory for the study of the relationship between galaxy interactions and nuclear activity. Previous optical emission line studies indicated a strong ionising continuum in the galaxies, but its origin, whether from starbursts, or AGN, was unclear. Combined imaging and spectroscopy with the EPIC X-ray CCDs unequivocally reveals a heavily obscured AGN and a separately identified thermal (starburst) plasma, in NGC 835, NGC 833, & NGC 839. NGC 838 shows only starburst thermal emission. Starbursts and AGN can evidently coexist in members of this highly evolved system of merged and merging galaxies, implying a high probability for the formation of AGN as well as starbursts in post-merger galaxies.
DOI Link: 10.1051/0004-6361:20000070
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2001 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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