Cosmic evolution of black holes and galaxies to z=0.4

Details Cosmic evolution of black holes and galaxies to z=0.4 Cosmic evolution of black holes and galaxies to z=0.4

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..291w&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Computer Science

Scientific paper

Investigating the nature of the black hole-galaxy connection is essential in understanding black hole growth and galaxy evolution. We test the evolution of the correlation between black hole mass and bulge velocity dispersion (M[BH]-σ ) using a carefully selected sample of 14 Seyfert 1 galaxies at z=0.36±0.01. We measure velocity dispersion from stellar absorption lines around Mgb (5175A) and Fe (5270A) using high S/N Keck spectra, and estimate black hole mass from the Hβ line width and the optical luminosity at 5100A, based on the empirically calibrated photo-ionization method. We find a significant offset from the local relation, in the sense that velocity dispersions were smaller for given black hole masses at z=0.36 than locally. The measured offset is Δlog M[BH] = 0.62±0.10 ±0.25, i.e. Δlog σ =0.15 ±0.03 ± 0.06, where the error bars include a random component and an upper limit to the systematics. At face value, this result implies a substantial growth of bulges in the last 4 Gyr, assuming that the local M[BH]-σ relation is the universal evolutionary end-point. Along with two samples of active galaxies with consistently determined black hole mass and stellar velocity dispersion taken from the literature, we quantify the observed evolution± with the best fit linear relation, Δlog M[BH] = (1.66±0.43)z + (0.04±0.09) with respect to the local relationship of Tremaine et al. (2002), and Δlog M[BH] = (1.55±0.46)z + (0.01±0.12) with respect to that of Ferrarese (2002). This result is consistent with the growth of black holes predating the final growth of bulges at these mass scales (<σ> =170 km s-1).

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