Cosmic Evolution of Black Holes and Spheroids. II: Scaling Relations at z=0.36

Details Cosmic Evolution of Black Holes and Spheroids. II: Scaling Relations at z=0.36 Cosmic Evolution of Black Holes and Spheroids. II: Scaling Relations at z=0.36

2007-06-04

arxiv.org/abs/0706.0519v1

Astrophys.J.667:117-130,2007

Astronomy and Astrophysics

Astrophysics

17 pages, 10 figures; accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/520633

We combine Hubble Space Telescope images of a sample of 20 Seyfert galaxies at z=0.36 with spectroscopic information from the Keck Telescope to determine the black hole mass - spheroid luminosity relation (M-L), the Fundamental Plane (FP) of the host galaxies and the M-sigma relation. Assuming pure luminosity evolution, we find that the host spheroids had smaller luminosity and stellar velocity dispersion than today for a fixed M. The offsets correspond to Delta log L_B,0=0.40+-0.11+-0.15 (Delta log M = 0.51+-0.14+-0.19) and Delta log sigma = 0.13+-0.03+-0.05 (Delta log M = 0.54+-0.12+-0.21), respectively for the M-L and M-sigma relation. A detailed analysis of known systematic errors and selection effects shows that they cannot account for the observed offset. The data are inconsistent with pure luminosity evolution and the existence of universal and tight scaling relations. To obey the three local scaling relations by z=0 the distant spheroids have to grow their stellar mass by approximately 60% (\Delta log M_sph=0.20+-0.14) in the next 4 billion years. The measured evolution can be expressed as M/ M_sph ~ (1+z)^{1.5+-1.0}. Based on the disturbed morphologies of a fraction of the sample (6/20) we suggest collisional mergers with disk-dominated systems as evolutionary mechanism.

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