The Subaru/XMM-Newton Deep Field - II. The 37 brightest radio sources

Details The Subaru/XMM-Newton Deep Field - II. The 37 brightest radio sources The Subaru/XMM-Newton Deep Field - II. The 37 brightest radio sources

2008-03-19

arxiv.org/abs/0803.2801v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication by MNRAS; 39 pages, 7 figures, 4 tables

Scientific paper

10.1111/j.1365-2966.2008.13246.x

We study the 37 brightest radio sources in the Subaru/XMM-Newton Deep Field (SXDF). We have spectroscopic redshifts for 24 of 37 objects and photometric redshifts for the remainder, yielding a median redshift z_med for the whole sample of z_med ~= 1.1 and a median radio luminosity close to the `FRI/FRII' luminosity divide. Using mid-IR (Spitzer MIPS 24 um) data we expect to trace nuclear accretion activity, even if it is obscured at optical wavelengths, unless the obscuring column is extreme. Our results suggest that above the FRI/FRII radio luminosity break most of the radio sources are associated with objects that have excess mid-IR emission, only some of which are broad-line objects, although there is one clear low-accretion-rate object with an FRI radio structure. For extended steep-spectrum radio sources, the fraction of objects with mid-IR excess drops dramatically below the FRI/FRII luminosity break, although there exists at least one high-accretion-rate `radio-quiet' QSO. We have therefore shown that the strong link between radio luminosity (or radio structure) and accretion properties, well known at z ~ 0.1, persists to z ~ 1. Investigation of mid-IR and blue excesses shows that they are correlated as predicted by a model in which, when significant accretion exists, a torus of dust absorbs ~30% of the light, and the dust above and below the torus scatters >~1% of the light.

Affiliated with

Also associated with

No associations

Rating

The Subaru/XMM-Newton Deep Field - II. The 37 brightest radio sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Subaru/XMM-Newton Deep Field - II. The 37 brightest radio sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Subaru/XMM-Newton Deep Field - II. The 37 brightest radio sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-323128