Radio-quiet objects in the 2QZ survey

Details Radio-quiet objects in the 2QZ survey Radio-quiet objects in the 2QZ survey

2005-02-21

arxiv.org/abs/astro-ph/0502401v1

Mon.Not.Roy.Astron.Soc.360:453-457,2005

Astronomy and Astrophysics

Astrophysics

MNRAS accepted, 5 pages, 5 figures

Scientific paper

10.1111/j.1365-2966.2005.08926.x

Co-addition of blank-field FIRST data at the location of over 8000 QSOs in the 2QZ survey has yielded statistical detections of radio quiet QSOs with median flux levels of 20-40microJy. We show that the total radio flux of radio-quiet QSOs in the 2QZ is consistent with a smooth extrapolation of the 2QZ radio-loud QSO number-flux distribution based on the slope of the relation flattening near the FIRST flux limit. However, we are unable to distinguish a smooth extrapolation of the luminosity function to faint levels from a bimodal luminosity function with a break close to or below the FIRST radio detection limit. We also demonstrate that the redshift dependence of the median radio-to-optical spectral index for these radio quiet QSOs is consistent with that obtained for individual radio-loud 2QZ QSOs detected by FIRST.

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