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|Title:||Low-power radio galaxy environments in the Subaru/XMM-Newton Deep Field at z ∼ 0.5|
Watson, Michael G.
|Publisher:||Blackwell Publishing on behalf of the Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2007, 381 (4), pp. 1369-1380|
|Abstract:||We present multiobject spectroscopy of galaxies in the immediate (Mpc-scale) environments of four low-power (L1.4 GHz≲ 1025 W Hz−1) radio galaxies at z∼ 0.5, selected from the Subaru/XMM–Newton Deep Field. We use the spectra to calculate velocity dispersions and central redshifts of the groups the radio galaxies inhabit, and combined with XMM–Newton (0.3–10 keV) X-ray observations investigate the LX–σv and TX–σv scaling relationships. All the radio galaxies reside in moderately rich groups – intermediate environments between poor groups and rich clusters, with remarkably similar X-ray properties. We concentrate our discussion on our best statistical example that we interpret as a low-power (Fanaroff–Riley type I) source triggered within a subgroup, which in turn is interacting with a nearby group of galaxies, containing the bulk of the X-ray emission for the system – a basic scenario which can be compared to more powerful radio sources at both high (z > 4) and low (z < 0.1) redshifts. This suggests that galaxy–galaxy interactions triggered by group mergers may play an important role in the life-cycle of radio galaxies at all epochs and luminosities.|
|Rights:||Copyright © 2007 The Authors. Journal compilation © 2007 RAS. Deposited with reference to the publisher's archiving policy available from the Journal Exclusive Licence Form, which permits posting of the Blackwell Publishing PDF 6 months after publication. The definitive version is available at www.blackwell-synergy.com|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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|j.1365-2966.2007.12329.x.pdf||Publisher Version||944.09 kB||Adobe PDF||View/Open|
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