SIMBAD references

2008AJ....135..928S - Astron. J., 135, 928-946 (2008/March-0)

The black hole-bulge relationship in luminous broad-line active galactic nuclei and host galaxies.


Abstract (from CDS):

We have measured the stellar velocity dispersions (σ*) and estimated the central black hole (BH) masses for over 900 broad-line active galactic nuclei (AGNs) observed with the Sloan Digital Sky Survey. The sample includes objects which have redshifts up to z = 0.452, high-quality spectra, and host galaxy spectra dominated by an early-type (bulge) component. The AGN and host galaxy spectral components were decomposed using an eigenspectrum technique. The BH masses (MBH) were estimated from the AGN broad-line widths, and the velocity dispersions were measured from the stellar absorption spectra of the host galaxies. The range of black hole masses covered by the sample is approximately 106<MBH<109M. The host galaxy luminosity-velocity dispersion relationship follows the well-known Faber-Jackson relation for early-type galaxies, with a power-law slope 4.33±0.21. The estimated BH masses are correlated with both the host luminosities (LH) and the stellar velocity dispersions (σ*), similar to the relationships found for low-redshift, bulge-dominated galaxies. The intrinsic scatters in the correlations are large (∼0.4 dex), but the very large sample size allows tight constraints to be placed on the mean relationships: MBH∝L0.73±0.05H and MBH∝σ3.34±0.24*. The amplitude of the MBH* relation depends on the estimated Eddington ratio, such that objects with larger Eddington ratios have smaller black hole masses than expected at a given velocity dispersion. While this dependence is probably caused at least in part by sample selection effects, it can account for the intrinsic scatter in the MBH*relation, and may tie together the accretion rate with physical properties of the host bulge component. We find no significant evolution in the MBH* relation with redshift, up to z ~ 0.4, after controlling for possible dependences on other variables. Interested readers can contact the authors to obtain the eigenspectrum decomposition coefficients of our objects.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: bulges - galaxies: nuclei - quasars: general

VizieR on-line data: <Available at CDS (J/AJ/135/928): table1.dat>

Simbad objects: 963

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