Deep VLBI Imaging of Faint Radio Sources in the NOAO Bootes Field

Details Deep VLBI Imaging of Faint Radio Sources in the NOAO Bootes Field Deep VLBI Imaging of Faint Radio Sources in the NOAO Bootes Field

2004-10-07

arxiv.org/abs/astro-ph/0410176v1

Astrophys.J. 619 (2005) 105-115

Astronomy and Astrophysics

Astrophysics

ApJ in press, 36 pages. Reduced abstract presented here

Scientific paper

10.1086/426424

We have conducted a deep, very long baseline interferometry (VLBI) observation at 1.4 GHz of an area of sky located within the NOAO Bootes field, using the NRAO VLBA and 100-m Green Bank Telescope. Applying wide-field VLBI techniques, a total of 61 sources, selected from a WSRT image, were surveyed simultaneously with a range of different sensitivities and resolutions. The inner 0-2', of the field reached an unprecedented 1-sigma rms noise level ~ 9 uJy/beam and yielded 2 detections. A further 7 sources were detected in the rest of the field. All of the sources have a brightness temperature in excess of 10^5 K; suggesting they are AGN. Optical identifications are available for 8 of the 9 VLBI detections - only VLBI J142906.6095 remains unidentified (I > 25.6m). Two sources are not detected in K-band (K > 18.5m) suggesting that some significant fraction of these compact radio sources may be located at z > 1. The VLBI detection rate for sub-mJy radio sources is 8^{+4}_{-5} %. The VLBI detection rate for mJy sources is higher, 29^{+11}_{-12}%. This trend is expected if the radio emission associated with fainter sub-mJy and microJy sources increasingly arises from extended regions of star formation. The 9 VLBI detections pin-point the precise location of AGN or candidate AGN, and their VLBI positions can help to anchor the NOAO Bootes field to the ICRF. The simultaneous detection of several sub-mJy and mJy radio sources, in a single observation, suggest that their combined response may be used to self-calibrate wide-field VLBI data. Future VLBI observations of faint sub-mJy and microJy radio sources can take full advantage of this "full-beam" calibration technique.

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