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Medientyp:
E-Artikel
Titel:
STELLAR AND BLACK HOLE MASS DENSITIES AS EMPIRICAL TRACERS OF CO-EVOLUTION SHOW LOCK-STEP GROWTH SINCE Z ∼ 3
Beteiligte:
Schindler, Jan-Torge;
Fan, Xiaohui;
Duschl, Wolfgang J.
Erschienen:
American Astronomical Society, 2016
Erschienen in:
The Astrophysical Journal, 826 (2016) 1, Seite 67
Sprache:
Ohne Angabe
DOI:
10.3847/0004-637x/826/1/67
ISSN:
0004-637X;
1538-4357
Entstehung:
Anmerkungen:
Beschreibung:
ABSTRACT At redshifts beyond , 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 . 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 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 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.