Astrophys. J., 752, 61 (2012/June-2)
Unidentified γ-ray sources: hunting γ-ray blazars.
MASSARO F., D'ABRUSCO R., TOSTI G., AJELLO M., PAGGI A. and GASPARRINI D.
Abstract (from CDS):
One of the main scientific objectives of the ongoing Fermi mission is unveiling the nature of unidentified γ-ray sources (UGSs). Despite the major improvements of Fermi in the localization of γ-ray sources with respect to the past γ-ray missions, about one-third of the Fermi-detected objects are still not associated with low-energy counterparts. Recently, using the Wide-field Infrared Survey Explorer survey, we discovered that blazars, the rarest class of active galactic nuclei and the largest population of γ-ray sources, can be recognized and separated from other extragalactic sources on the basis of their infrared (IR) colors. Based on this result, we designed an association method for the γ-ray sources to recognize if there is a blazar candidate within the positional uncertainty region of a generic γ-ray source. With this new IR diagnostic tool, we searched for γ-ray blazar candidates associated with the UGS sample of the second Fermi γ-ray LAT catalog (2FGL). We found that our method associates at least one γ-ray blazar candidate as a counterpart to each of 156 out of 313 UGSs analyzed. These new low-energy candidates have the same IR properties as the blazars associated with γ-ray sources in the 2FGL catalog.
BL Lacertae objects: general - galaxies: active - gamma rays: galaxies - radiation mechanisms: non-thermal
VizieR on-line data:
<Available at CDS (J/ApJ/752/61): table2.dat>
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