STELLAR AND BLACK HOLE MASS DENSITIES AS EMPIRICAL TRACERS OF CO-EVOLUTION SHOW LOCK-STEP GROWTH SINCE Z ∼ 3
AffiliationUniv Arizona, Steward Observ
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PublisherIOP PUBLISHING LTD
CitationSTELLAR AND BLACK HOLE MASS DENSITIES AS EMPIRICAL TRACERS OF CO-EVOLUTION SHOW LOCK-STEP GROWTH SINCE Z ∼ 3 2016, 826 (1):67 The Astrophysical Journal
JournalThe Astrophysical Journal
Rights© 2016. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractAt redshifts beyond z similar to 1, measuring the black hole (BH) galaxy relations proves to be a difficult task. The bright light of the active galactic nuclei aggravates the deconvolution of BH and galaxy properties. However, high-redshift data on these relations are vital to understand the ways in which galaxies and BHs co-evolve and the ways in which they do not. In this work we use BH and stellar mass densities (BHMDs and SMDs) to constrain the possible co-evolution of BHs with their host galaxies since z similar to 5. The BHMDs are calculated from quasar luminosity functions using the Soltan argument, while we use integrals over stellar mass functions or the star-formation rate density to obtain values for the SMD. We find that both quantities grow in lock-step below redshifts of z similar to 3 with a non-evolving BHMD to SMD ratio. A fit to the data assuming a power-law relation between the BHMD and the SMD yields exponents around unity (1.0-1.5). Up to z similar to 5 the BHMD to SMD ratio does not show a strong evolution given the larger uncertainty in the completeness of high-redshift data sets. Our results, always applying the same analysis technique, seem to be consistent across all adopted data sets.
VersionFinal published version
SponsorsNSF [AST 11-07682, 15-15115]