Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs

Details Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs

2003-04-04

arxiv.org/abs/astro-ph/0304097v1

Astron.J. 126 (2003) 15

Astronomy and Astrophysics

Astrophysics

25 pages, 12 figures. accepted by AJ

Scientific paper

10.1086/375645

We present 1.4 and 5 GHz observations taken with the Very Large Array (VLA), and observations at 250 GHz obtained with the Max-Planck millimeter bolometer (MAMBO) at the IRAM 30~m telescope, of ten optically selected Quasi-stellar Objects (QSOs) at 5.0 < z < 6.28. Four sources are detected at 1.4 GHz two of which are radio loud and are also detected at 5 GHz. These results are roughly consistent with there being no evolution of the radio-loud QSO fraction out to z~6. Three sources have been detected at 250 GHz or 350 GHz at much higher levels than their 1.4 GHz flux densities suggesting that the observed mm emission is likely thermal emission from warm dust, although more exotic possibilities cannot be precluded. The highest redshift source in our sample (J1030+0524 at z=6.28) is not detected at 1.4 or 250 GHz, but four fairly bright radio sources (flux density at 1.4GHz > 0.2 mJy) are detected in a 2' field centered on the QSO, including an edge-brightened ('FRII') double radio source with an extent of about 1'. A similar over-density of radio sources is seen in the field of the highest redshift QSO J1148+5251. We speculate that these over-densities of radio sources may indicate clusters along the lines-of-sight, in which case gravitational lensing by the cluster could magnify the QSO emission by a factor 2 or so without giving rise to arcsecond-scale distortions in the optical images of the QSOs.

Affiliated with

Also associated with

No associations

Rating

Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensitive observations at 1.4 and 250 GHz of z > 5 QSOs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-143196