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Distribution in Depth of Quasars

Published online by Cambridge University Press:  14 August 2015

Maarten Schmidt  and
Richard F. Green
Maarten Schmidt
Affiliation:
Hale Observatories1, California Institute of Technology
Richard F. Green
Affiliation:
Hale Observatories1, California Institute of Technology

Extract

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We discuss the distribution in depth of different kinds of quasars: quasi-stellar radio sources with steep radio spectrum, those with flat radio spectrum, and optically selected quasars. All exhibit an increase of space density with distance to a different degree. The optically selected quasars, in particular, show a steep increase of surface density with magnitude. The steepness of the increase is inconsistent with a uniform distribution of quasars in the local hypothesis. In the cosmological hypothesis the co-moving space density of optically selected quasars increases by a factor of 100,000 to a redshift of 2, and by factors of 1000 and 10 for steep-spectrum and flat-spectrum radio quasars, respectively.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 92: Objects of High Redshift , 1980 , pp. 73 - 76
Copyright
Copyright © Reidel 1980 

References

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