j.1365-2966.2007.12329.x.pdf (944.09 kB)
Download file

Low-power radio galaxy environments in the Subaru/XMM-Newton Deep Field at z ∼ 0.5

Download (944.09 kB)
journal contribution
posted on 26.09.2012, 14:02 by J.E. Geach, C. Simpson, S. Rawlings, A.M. Read, Michael G. Watson
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.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2007, 381 (4), pp. 1369-1380

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Blackwell Publishing on behalf of the Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

2007

Available date

26/09/2012

Publisher version

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2007.12329.x/abstract

Language

en

Usage metrics

Categories

Exports