Cosmological test using the high-redshift detection rate of FSRQs with the Square Kilometre Array
AffiliationUniv Arizona, Dept Phys
Univ Arizona, Dept Phys, Appl Math Program
Univ Arizona, Dept Astron
large-scale structure of Universe
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PublisherOXFORD UNIV PRESS
CitationLeaf, K., & Melia, F. (2019). Cosmological test using the high-redshift detection rate of FSRQs with the Square Kilometre Array. Monthly Notices of the Royal Astronomical Society, 487(2), 2030-2037.
Rights©2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
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AbstractWe present a phenomenological method for predicting the number of flat-spectrum radio quasars (FSRQs) that should be detected by upcoming Square Kilometre Array (SKA) SKA1-MID Wide Band 1 and Medium-Deep Band 2 surveys. We use the Fermi blazar sequence and mass estimates of Fermi FSRQs, and gamma-ray emitting narrow-line Seyfert 1 galaxies, to model the radio emission of FSRQs as a function of mass alone, assuming a near-Eddington accretion rate, which is suggested by current quasar surveys at z greater than or similar to 6. This is used to determine the smallest visible black hole mass as a function of redshift in two competing cosmologies we compare in this paper: the standard Lambda cold dark matter (Lambda CDM) model and the R-h = ct universe. We then apply lockstep growth to the observed black hole mass function at z = 6 in order to devolve that population to higher redshifts and determine the number of FSRQs detectable by the SKA surveys as a function of z. We find that at the redshifts for which this method is most valid, Lambda CDM predicts similar to 30 times more FSRQs than R-h = ct for the Wide survey, and similar to 100 times more in the Medium-Deep survey. These stark differences will allow the SKA surveys to strongly differentiate between these two models, possibly rejecting one in comparison with the other at a high level of confidence.
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