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Title: CLUSTERING OF γ-RAY-SELECTED 2LAC FERMI BLAZARS

We present the first measurement of the projected correlation function of 485 γ-ray-selected blazars, divided into 175 BL Lacertae (BL Lacs) and 310 flat-spectrum radio quasars (FSRQs) detected in the 2 year all-sky survey by the Fermi-Large Area Telescope. We find that Fermi BL Lacs and FSRQs reside in massive dark matter halos (DMHs) with log M{sub h} = 13.35{sub −0.14}{sup +0.20} and log M{sub h} = 13.40{sub −0.19}{sup +0.15} h {sup –1} M {sub ☉}, respectively, at low (z ∼ 0.4) and high (z ∼ 1.2) redshift. In terms of clustering properties, these results suggest that BL Lacs and FSRQs are similar objects residing in the same dense environment typical of galaxy groups, despite their different spectral energy distributions, power, and accretion rates. We find no difference in the typical bias and hosting halo mass between Fermi blazars and radio-loud active galactic nuclei (AGNs), supporting the unification scheme simply equating radio-loud objects with misaligned blazar counterparts. This similarity in terms of the typical environment they preferentially live in, suggests that blazars tend to occupy the center of DMHs, as already pointed out for radio-loud AGNs. This implies, in light of several projects looking for the γ-ray emission from DMmore » annihilation in galaxy clusters, a strong contamination from blazars to the expected signal from DM annihilation.« less
Authors:
;  [1] ;  [2]
  1. Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki (Finland)
  2. University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250 (United States)
Publication Date:
OSTI Identifier:
22364857
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 797; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; BL LACERTAE OBJECTS; BLACK HOLES; CORRELATION FUNCTIONS; ENERGY SPECTRA; GALAXIES; GALAXY CLUSTERS; GALAXY NUCLEI; MASS; NONLUMINOUS MATTER; QUASARS; RED SHIFT; STAR ACCRETION; TELESCOPES; UNIVERSE; VISIBLE RADIATION; X RADIATION