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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A population of high-redshift type 2 quasars - I. Selection criteria and optical spectra
Monthly Notices of the Royal Astronomical Society, Volume 370, No. 3, Year 2006
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Description
We discuss the relative merits of mid-infrared and X-ray selection of type 2 quasars. We describe the mid-infrared, near-infrared and radio selection criteria used to find a population of redshift z ∼ 2 type 2 quasars which we previously argued suggests that most supermassive black hole growth in the Universe is obscured. We present the optical spectra obtained from the William Herschel Telescope, and we compare the narrow emission-line luminosity, radio luminosity and maximum size of jets to those of objects from radio-selected samples. This analysis suggests that these are genuine radio-quiet type 2 quasars, albeit the radio-bright end of this population. We also discuss the possibility of two different types of quasar obscuration, which could explain how the ∼2-3:1 ratio of type 2 to type 1 quasars preferred by modelling our population can be reconciled with the ∼1:1 ratio predicted by unified schemes. © 2006 RAS.
Authors & Co-Authors
Martínez-Sansigre, Alejo M.S.
United Kingdom, Oxford
University of Oxford
Rawlings, Steve G.
United Kingdom, Oxford
University of Oxford
Lacy, Mark D.
United States, Pasadena
California Institute of Technology
Jarvis, Matthew J.
United Kingdom, Oxford
University of Oxford
Simpson, Chris J.S.M.
United Kingdom, Durham
Durham University
United Kingdom, Liverpool
Liverpool John Moores University
Willott, Chris J.
Canada, Ottawa
National Research Council Canada
Statistics
Citations: 79
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1111/j.1365-2966.2006.10563.x
ISSN:
00358711
Research Areas
Environmental
Study Design
Cross Sectional Study