SIMBAD references

2011A&A...536A..35F - Astronomy and Astrophysics, volume 536A, 35-35 (2011/12-1)

Optically faint radio sources: reborn AGN?


Abstract (from CDS):

We present our discovery of several relatively strong radio sources in the field-of-view of SDSS galaxy clusters that have no optical counterparts down to the magnitude limits of the SDSS. The optically faint radio sources appear as double-lobed or core-jet objects in the FIRST radio images and have projected angular sizes ranging from 0.5 to 1.0-arcmin. We followed-up these sources with near-infrared imaging using the wide-field imager HAWK-I on the VLT. We detected Ks-band emitting regions, about 1.5-arcsec in size and coincident with the centers of the radio structures, in all sources, with magnitudes in the range 17-20mag. We used spectral modelling to characterize the sample sources. In general, the radio properties are similar to those observed in 3CRR sources but the optical-radio slopes are consistent with those of moderate to high redshift (z<4) gigahertz-peaked spectrum sources. Our results suggest that these unusual objects are galaxies whose black hole has been recently re-ignited but that retain large-scale radio structures, which are signatures of previous AGN activity.

Abstract Copyright:

Journal keyword(s): galaxies: active

Nomenclature: Tables 3,4 : [FBL2011] NNNNN Aa ; [FBL2011] NNNNN AN N=28+26

Simbad objects: 72

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