Mon. Not. R. Astron. Soc., 381, 1369-1380 (2007/November-2)
Low-power radio galaxy environments in the Subaru/XMM-Newton Deep Field at z ∼ 0.5.
GEACH J.E., SIMPSON C., RAWLINGS S., READ A.M. and WATSON M.
Abstract (from CDS):
We present multiobject spectroscopy of galaxies in the immediate (Mpc-scale) environments of four low-power (L1.4GHz≲ 1025 W/Hz) radio galaxies at z ∼ 0.5, selected from the Subaruquest/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 (0.3-10keV) 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.
2007 The Authors. Journal compilation © 2007 RAS
galaxies: evolution - cosmology: observations
VizieR on-line data:
<Available at CDS (J/MNRAS/381/1369): table3.dat>
Table 1: [GSR2007] JEGN (Nos JEG1 to JEG4). Text, Table 3:[GSR2007] JEGN Group (Nos JEG1 Group to JEG4 Group). Table 3: [GSR2007] SXDF-iE-NNNNNN N=8, [GSR2007] SXDF-iS-NNNNNN N=38.
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