Filtering AGNs from Starbursts in Deep VLBA+GBT Fields

Details Filtering AGNs from Starbursts in Deep VLBA+GBT Fields Filtering AGNs from Starbursts in Deep VLBA+GBT Fields

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.7812w&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #78.12; Bulletin of the American Astronomical Society, Vol. 34, p.1233

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For starbursts, free-free absorption limits the total brightness temperature Tb of the coextensive thermal and nonthermal radio emission to a few times the electron temperature of about 104 K (Condon, 1992, ARAA, 30, 575). For active galactic nuclei (AGNs), higher brightness temperatures are reached. Sky patches can be filtered for AGN with Tb > 2 x 105 K through deep observations at a frequency ν = 1.4 GHz with the NRAO VLBA and GBT. Such filtering observations were recently made, within a patch of the NDWFS Boötes field known from WSRT images to be densely populated with faint radio sources (de Vries et al. 2002, AJ, 123, 1784; Morganti & Garrett, 2002, ASTRON Newsletter, No. 17). Any WSRT source that is also detected with the VLBA+GBT cannot be energized by just a starburst. Analysis of the VLBA+GBT data is in progress. Phase referencing to the in-beam calibrator WSRT J142910+352945 yields an rms sensitivity of 9 μ Jy beam-1 and, so far, two clear detections. One is of a 400-μ Jy source coincident with WSRT J142934+352858. This AGN is hosted by a candidate high-redshift galaxy, as inferred from the host's apparent drop-out in the BW band of the NDWFS. The other detection locates the 300-μ Jy AGN embedded in WSRT J142923+352851. Both detections are astrometrically anchored to the ICRF. This work made use of images provided by the NDWFS (Jannuzi & Dey, 1999, ASP Conference Series, 191, 111), which is supported by NOAO. NOAO is operated by AURA, Inc., under a cooperative agreement with the NSF. NRAO is a facility of the NSF operated under cooperative agreement by AUI.

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