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Landoni, M; Massaro, F; Paggi, A; D'Abrusco, R; Milisavljevic, D; Masetti, N; Smith, H A; Tosti, G; Chomiuk, L; Strader, J; Cheung, C C
The Astronomical journal, 05/2015, Letnik: 149, Številka: 5Journal Article
We report the results of our exploratory program carried out with the southern Astrophysical Research telescope aimed at associating counterparts and establishing the nature of the Fermi Unidentified gamma -ray Sources (UGSs). We selected the optical counterparts of six UGSs from the Fermi catalog on the basis of our recently discovered tight connection between infrared and gamma -ray emission found for the gamma -ray blazars detected by the Wide-Field Infrared Survey Explorer in its all-sky survey. We perform for the first time a spectroscopic study of the low-energy counterparts of the Fermi UGSs, in the optical band, confirming the blazar-like nature of the whole sample. We also present new spectroscopic observations of six active galaxies of uncertain type associated with Fermi sources which appear to be BL Lac objects. Finally, we report the spectra collected for six known gamma -ray blazars belonging to the Roma BZCAT that were obtained to establish their nature or better estimate their redshifts. Two interesting cases of high redshift and extremely luminous BL Lac objects (z > or =, slanted 1.18 and z > or =, slanted 1.02, based on the detection of Mg II intervening systems) are also discussed.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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