Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 393, Issue 2, Pages 377-392Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.14235.x
Keywords
gravitational lensing; galaxies: active; galaxies: formation; galaxies: haloes; dark matter; large-scale structure of Universe
Categories
Funding
- NASA through Hubble Fellowship [HST-HF-01199.02-A]
- Space Telescope Science Institute
- NASA [NAS 5-26555]
- Joint Postdoctoral Programme in Astrophysical Cosmology of Max Planck Institute for Astrophysics
- Shanghai Astronomical Observatory
- NSFC [10533030, 10643005, 10633020]
- 973 Program [2007CB815402]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
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We compute two-point correlation functions and measure the shear signal due to galaxy-galaxy lensing for 80 000 optically identified and 5700 radio-loud active galactic nuclei (AGN) from Data Release 4 of the Sloan Digital Sky Survey. Halo occupation models are used to estimate halo masses and satellite fractions for these two types of AGN. The large sample size allows us to separate AGN according to the stellar mass of their host galaxies. We study how the halo masses of optical and radio AGN differ from those of the parent population at fixed M-double dagger. Halo masses deduced from clustering and from lensing agree satisfactorily. Radio AGN are found in more massive haloes than optical AGN: in our samples, their mean halo masses are 1.6 x 10(13) and 8 x 10(11) h(-1) M-circle dot, respectively. Optical AGN follow the same relation between stellar mass and halo mass as galaxies selected without regard to nuclear properties, but radio-loud AGN deviate significantly from this relation. The dark matter haloes of radio-loud AGN are about twice as massive as those of control galaxies of the same stellar mass. This boost is independent of radio luminosity, and persists even when our analysis is restricted to field galaxies. The large-scale gaseous environment of the galaxy clearly plays a crucial role in producing observable radio emission. The dark matter halo masses that we derive for the AGN in our two samples are in good agreement with recent models in which feedback from radio AGN becomes dominant in haloes where gas cools quasi-statically.
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