Application of the Loh-Spillar Cosmological Test to Quasars

Details Application of the Loh-Spillar Cosmological Test to Quasars Application of the Loh-Spillar Cosmological Test to Quasars

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l..85s&link_type=abstract

Astrophysical Journal Letters v.423, p.L85

Astronomy and Astrophysics

Astronomy

2

Cosmology: Observations, Galaxies: Quasars: General, Galaxies: Active, Galaxies: Luminosity Function, Mass Function

Scientific paper

The Loh-Spillar (L-S) cosmological test relies on a knowledge of the local space density of a population of test particles and a luminosity function for that population whose redshift dependence can be described by pure luminosity evolution. Using a newly derived local luminosity function for active galactic nuclei (AGNs) from a complete X-ray-selected sample of 78 objects at z < 0.15 and the previously known property of complete quasar samples to apparently exhibit pure luminosity evolution, we apply the L-S test to a combined sample of 447 quasars and derive a value of {OMEGA}_0_ = 0.2_-0.1_^+0.15^ (1 σ errors) assuming λ_0_ = 0 or {OMEGA}_0_ = 0.4_-0.06_^+0.1^ in a cosmologically flat model ({OMEGA}_0_ +λ_0_= 1). The formal errors are remarkably small but do not account for systematic errors which are present if any of the requirements of the L-S technique are not met. Alternatively, we can state that the adopted pure luminosity evolution model for the evolution of the quasar luminosity function, including a normalization of the local AGN population at the same level as that of high-redshift quasars, is inconsistent with {OMEGA}_0_ = 1 at a high level of significance.

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