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Cosmological test using the high-redshift detection rate of FSRQs with the Square Kilometre Array.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Aug2019, Vol. 487 Issue 2, p2030-2037. 8p. - Publication Year :
- 2019
-
Abstract
- We 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 γ-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  ≳ 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 Λ cold dark matter (ΛCDM) 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, ΛCDM predicts ∼30 times more FSRQs than R h =  ct for the Wide survey, and ∼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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 487
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 137364021
- Full Text :
- https://doi.org/10.1093/mnras/stz1396