/ftp/cats/aliases/W/WFB



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J/ApJS/206/12 Unidentified gamma-ray sources. I. Associations (D'Abrusco+, 2013)
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Beginning of ReadMe : J/ApJS/206/12 Blazars with gamma-ray counterparts. I. (D'Abrusco+, 2013) ================================================================================ Unveiling the nature of unidentified gamma-ray sources. I. A new method for the association of gamma-ray blazars. D'Abrusco R., Massaro F., Paggi A., Masetti N., Tosti G., Giroletti M., Smith H.A. <Astrophys. J. Suppl. Ser., 206, 12 (2013)> =2013ApJS..206...12D ================================================================================ ADC_Keywords: BL Lac objects ; Photometry, infrared ; Redshifts ; QSOs ; Gamma rays ; Cross identifications Keywords: BL Lacertae objects: general - catalogs - galaxies: active - gamma rays: general - infrared: general - radiation mechanisms: non-thermal Abstract: We present a new method for identifying blazar candidates by examining the locus, i.e., the region occupied by the Fermi gamma-ray blazars in the three-dimensional color space defined by the WISE infrared colors. This method is a refinement of our previous approach that made use of the two-dimensional projection of the distribution of WISE gamma-ray-emitting blazars (the Strip) in the three WISE color-color planes. In this paper, we define the three-dimensional locus by means of a principal component analysis of the color distribution of a large sample of blazars composed of all the ROMA-BZCAT sources with counterparts in the WISE All-Sky Catalog associated with gamma-ray sources in the second Fermi-LAT catalog (2FGL; the WISE Fermi blazars sample, WFB). Our new procedure yields a total completeness of c_tot_ 81% and a total efficiency of e_tot_ 97%. We also obtain local estimates of the efficiency and completeness as functions of the WISE colors and galactic coordinates of the candidate blazars. The catalog of all WISE candidate blazars associated with the WFB sample is also presented, complemented by archival multi-frequency information for the alternative associations. Finally, we apply the new association procedure to all gamma-ray blazars in the 2FGL and provide a catalog containing all the gamma-ray candidate blazars selected according to our procedure. Description: The starting sample used in our analysis is the one presented in the ROMA-BZCAT v4.1 (Massaro et al. 2009, Cat. J/A+A/495/691), released in 2012 August, the most comprehensive blazar catalog existing in the literature with 3149 bona fide blazars and blazar candidates. We note that the coordinates reported in the ROMA-BZCAT are non-uniform. The astrometric accuracy can be as low as  5", corresponding to the uncertainty of the NRAO Very Large Array Sky Survey (NVSS) for sources with radio fluxes close to the survey limit (Condon et al. 1998, Cat. VIII/65). For this reason, we have developed a method to perform the positional association between the ROMA-BZCAT blazars and their WISE counterparts. We found 3032 out of 3149 (i.e., 96.3% of the ROMA-BZCAT) blazars with an IR counterpart within 3.3" in the WISE All-Sky data archive. Of these 3032 blazars, 1172 are BZBs (BL Lac objects), including 919 BL Lac objects and 253 BL Lac candidates, 1642 are BZQs (flat spectrum radio quasar), and 218 are BZUs (blazar of uncertain type). Among the 3032 selected blazars, only 673 have a counterpart in the gamma-rays according to the 2FGL and to the CLEAN sample presented in the second Fermi-LAT catalog of AGNs (2LAC; Ackermann et al. 2011ApJ...743..171A). The sample of gamma-ray-emitting blazars in the ROMA-BZCAT catalog was derived excluding the BZU sources from our sample of gamma-ray-loud blazars. For this reason, the final WISE Fermi Blazar Sample (WFB) sample includes only 610 WISE sources out of 673 WISE counterparts. The sample of gamma-ray blazars associated with the 2FGL contains 752 gamma-ray sources, excluding all sources with any analysis flag. We excluded from this list the 610 blazars already contained in the WFB sample for a final number of 142 2FGL sources. These gamma-ray sources constitute the 2FGL Fermi blazar sample (hereinafter 2FB). The 2FB sample has been investigated with our association procedure following the same approach used for the WFB sample.