A complete sample of quasars from the 7C redshift survey

Journal article

We present details of a new sample of radio-loud quasars drawn from 0.013 sr of the 7C Redshift Survey. This sample is small (21 quasars) but complete in that every object with an unresolved nucleus and/or broad emission lines with S 151 MHZ > 0.5 Jy has been discovered. The dependence of the quasar fraction with redshift and radio luminosity is investigated, providing new evidence supporting the unification of radio-loud quasars and powerful radio galaxies. This 7C sample is compared with optically-selected quasars, in order to determine whether there are systematic biases in the different selection techniques. There are no lightly reddened (Av ∼ 1) quasars in our sample amongst the 14 with z < 2. The discovery of a reddened quasar at z = 2.034 and its implications are discussed. A tight correlation between radio luminosity and optical/near infrared continuum luminosity for a subset of the sample is also found.

Authors: Willott, C; Rawlings, S; Blundell, K; Lacy, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Observational Cosmology
• Volume: 226
• Pages: 209-210
• Publication date: 1998-01-01
• Acceptance date: 1997-01-13
• DOI: 10.1007/978-94-011-5238-9_36
• ISBN: 9789401062053
• Language: English
• Keywords: radio source; radio luminosity; radio galaxy; high redshift; broad emission line