Evidence for a population of beamed radio intermediate quasars

Details Evidence for a population of beamed radio intermediate quasars Evidence for a population of beamed radio intermediate quasars

2006-03-19

arxiv.org/abs/astro-ph/0603513v1

Astrophys.J. 645 (2006) 856-860

Astronomy and Astrophysics

Astrophysics

15 pages, 4 figures, 1 table, Accepted to the Astrophysical Journal

Scientific paper

10.1086/504397

Whether radio intermediate quasars possess relativistic jets as radio-loud quasars is an important issue in the understanding of the origin of radio emission in quasars. In this letter, using the two-epoch radio data obtained during Faint Image of Radio Sky at Twenty centimeter sky (FIRST) and NOAO VLA Sky Survey (NVSS), we identify 89 radio variable sources in the Sloan Digital Sky Survey. Among them, more than half are radio intermediate quasars (RL=f2cm/f2500A<250). For all objects with available multiple band radio observations, the radio spectra are either flat or inverted. The brightness temperature inferred from the variability is larger than the synchrotron-self Compton limit for a stationary source in 87 objects, indicating of relativistic beaming. Considering the sample selection and viewing angle effect, we conclude that relativistic jets probably exist in a substantianl fraction of radio intermediate quasars.

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