2015ApJ...800...93S -
Astrophys. J., 800, 93 (2015/February-3)
Wide field multiband imaging of low redshift quasar environments.
SCOTT J.E., RAFIEE A., BECHTOLD J., ELLINGSON E., THIBODEAU C. and RICHMOND M.
Abstract (from CDS):
We present photometry of the large-scale environments of a sample of 12 broad line active galactic nuclei (AGNs) with 0.06 < z < 0.37 from deep images in the Sloan Digital Sky Survey u, g, r, and i filters taken with the 90Prime prime focus camera on the Steward Observatory Bok Telescope. We measure galaxy clustering around these AGNs using two standard techniques: correlation amplitude (Bgq) and the two point correlation function. We find average correlation amplitudes for the 10 radio-quiet objects in the sample equal to (9±18, 144±114, -39±56, 295±260) Mpc1.77 in (u, g, r, i), all consistent with the expectation from galaxy clustering. Using a ratio of the galaxy-quasar cross-correlation function to the galaxy autocorrelation function, we calculate the relative bias of galaxies and AGNs, bgq. The bias in the u band, bgq= 3.08±0.51 is larger compared to that calculated in the other bands, but it does not correlate with AGN luminosity, black hole mass, or AGN activity via the luminosity of the [O III] emission line. Thus ongoing nuclear accretion activity is not reflected in the large scale environments from ∼10 h–1 kpc to ∼0.5 h–1 Mpc and may indicate a non-merger mode of AGN activity and/or a significant delay between galaxy mergers and nuclear activity in this sample of mostly radio-quiet quasars.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - large-scale structure of universe
VizieR on-line data:
<Available at CDS (J/ApJ/800/93): table1.dat table2.dat>
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