Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aj....133.1615l&link_type=abstract
The Astronomical Journal, Volume 133, Issue 4, pp. 1615-1624 (2007).
Astronomy and Astrophysics
Astronomy
16
Galaxies: Jets, Quasars: General, Techniques: High Angular Resolution
Scientific paper
We identify a large sample of radio quasars, including those with complex radio morphology, from the Sloan Digital Sky Survey and the Faint Images of the Radio Sky at Twenty cm (FIRST). Using this sample, we inspect previous radio quasar samples for selection effects resulting from complex radio morphologies and adopting a positional coincidence between radio and optical sources alone. We find that 13.0% and 8.1% of the radio quasars do not show a radio core within 1.2″ and 2″, respectively, of their optical position and thus are missed in such samples. Radio flux is underestimated by a factor of more than 2 for an additional 8.7% of the radio quasars. These missing radio-extended quasars are more radio-loud, with a typical radio-to-optical flux ratio, namely, radio loudness RL gtrsim 100 and radio power P gtrsim 1025 W Hz-1. They account for more than one-third of all quasars with RL > 100. The color of radio-extended quasars tends to be bluer than that of radio-compact quasars. This suggests that radio-extended quasars are more radio-powerful sources, e.g., Fanaroff-Riley type 2 sources, rather than the compact sources viewed at larger inclination angles. By comparison with the radio data from the NRAO VLA Sky Survey, we find that for sources with total radio flux less than 3 mJy, low surface brightness components tend to be underestimated by FIRST, indicating that lobes in these faint radio sources are still missed.
Lu Yu
Wang Tinggui
Wu Jian
Zhou Hongyan
No associations
LandOfFree
On the Selection Effect of Radio Quasars in the Sloan Digital Sky Survey 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 On the Selection Effect of Radio Quasars in the Sloan Digital Sky Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Selection Effect of Radio Quasars in the Sloan Digital Sky Survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1682280