High Sensitivity Array Observations of the z = 4.4 QSO BRI 1335-0417

Details High Sensitivity Array Observations of the z = 4.4 QSO BRI 1335-0417 High Sensitivity Array Observations of the z = 4.4 QSO BRI 1335-0417

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0212m&link_type=abstract

American Astronomical Society Meeting 210, #02.12; Bulletin of the American Astronomical Society, Vol. 39, p.94

Astronomy and Astrophysics

Astronomy

Scientific paper

We present sensitive phase-referenced VLBI results on the radio continuum emission from the z=4.4 QSO BRI 1335-0417. The observations were carried out at 1425 MHz using the High Sensitivity Array (HSA), which included the Very Long Baseline Array (VLBA), the phased Very Large Array (VLA), and the Green Bank Telescope (GBT). Our sensitive VLBI image at 189 x 113 mas resolution shows continuum emission in BRI 1335-0417 with a total flux density of 208 ± 46 uJy, consistent with the flux density measured with the VLA. The size of the source at FWHM is 255 x 138 mas (1.7 x 0.9 kpc) and the derived intrinsic brightness temperature is 4 x 104 K. No continuum emission is detected at the full VLBI resolution (32 x 7 mas), with a 4sigma point source upper limit of 34 uJy/beam, or an upper limit to the intrinsic brightness temperature of 5.6 x 105 K. The highest angular resolution with at least a 4.5sigma detection of the radio continuum emission is 53 x 27 mas. At this resolution, the images reveal a continuum feature in BRI 1335-0417 with a size of 64 x 35 mas (422 x 231 pc) at FWHM, and intrinsic brightness temperature of 2 x 105 K. The extent of the observed continuum source at 1.4 GHz and the derived brightness temperatures are consistent with nuclear starbursts. Moreover, the absence of any compact high-brightness temperature source suggests that there is no radio-loud AGN in the z=4.4 QSO BRI 1335-0417.

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