M_BH - sigma relation in SDSS flat-spectrum radio quasars

TL;DR

This study examines the black hole mass-velocity dispersion relation in flat-spectrum radio quasars, revealing deviations from established relations and linking jet physics with accretion processes.

Contribution

It provides the first analysis of the M_BH - sigma relation in FSRQs, showing deviations from inactive galaxy relations and exploring correlations with luminosities.

Findings

M_BH - sigma_[O III] relation deviates from Tremaine et al. for FSRQs.

No strong evidence of evolution in the relation up to z~0.8.

Strong correlation between jet luminosity and NLR luminosity.

Abstract

The relationship between the black hole mass and velocity dispersion indicated with [O III] line width is investigated for a sample of 87 flat-spectrum radio quasars (FSRQs) selected from SDSS DR3 quasar catalogue. We found the M_bh - sigma_[O III] relation is deviated from Tremaine et al. relation for nearby inactive galaxies, with a larger black hole mass at given velocity dispersion. There is no strong evidence of cosmology evolution in M_bh - sigma_[O III] relation up to z~0.8. A significant correlation between the [O III] luminosity and Broad Line Region (BLR) luminosity is found. When transferring the [O III] luminosity to Narrow Line Region (NLR) luminosity, the BLR luminosity is, on average, larger than NLR one by about one order of magnitude. We found a strong correlation between the synchrotron peak luminosity and NLR luminosity, which implies a tight relation between the jet physics and accretion process.