AffiliationUniv Arizona, Dept Phys, Program Appl Math
Univ Arizona, Dept Astron
large-scale structure of Universe
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationCosmological tests with the FSRQ gamma-ray luminosity function 2016, 462 (3):3094 Monthly Notices of the Royal Astronomical Society
Rights© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractThe extensive catalogue of gamma-ray selected flat-spectrum radio quasars (FSRQs) produced by Fermi during a four-year survey has generated considerable interest in determining their gamma-ray luminosity function (GLF) and its evolution with cosmic time. In this paper, we introduce the novel idea of using this extensive database to test the differential volume expansion rate predicted by two specific models, the concordance Lambda cold darkmatter (Lambda CDM) and R-h = ct cosmologies. For this purpose, we use two well-studied formulations of the GLF, one based on pure luminosity evolution (PLE) and the other on a luminosity-dependent density evolution (LDDE). Using a Kolmogorov-Smirnov test on one-parameter cumulative distributions (in luminosity, redshift, photon index and source count), we confirm the results of earlier works showing that these data somewhat favour LDDE over PLE; we show that this is the case for both Lambda CDM and R-h = ct. Regardless of which GLF one chooses, however, we also show that model selection tools very strongly favour R-h = ct over Lambda CDM. We suggest that such population studies, though featuring a strong evolution in redshift, may none the less be used as a valuable independent check of other model comparisons based solely on geometric considerations.
VersionFinal published version
SponsorsAmherst College; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]; Key Laboratory of Particle Astrophysics of Yunnan Province [2015DG035]; Strategic Priority Research Program, Emergence of Cosmological Structures of the Chinese Academy of Sciences [XDB09000000]; NSFC [11173064, 11233001, 11233008]