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Title: OPTICAL SPECTROSCOPIC OBSERVATIONS OF γ-RAY BLAZAR CANDIDATES. III. THE 2013/2014 CAMPAIGN IN THE SOUTHERN HEMISPHERE

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 γ-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 γ-ray emission found for the γ-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 γ-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 ≥ 1.18 and z ≥ 1.02, based on the detection of Mg ii intervening systems) are also discussed.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [7]
  1. INAF—Osservatorio Astronomico di Brera, Via Emilio Bianchi 46, I-23807 Merate (Italy)
  2. Yale Center for Astronomy and Astrophysics, Physics Department, Yale University, P.O. Box 208120, New Haven, CT 06520–8120 (United States)
  3. Harvard—Smithsonian Center of Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  4. INAF—Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, via Gobetti 101, I-40129, Bologna (Italy)
  5. Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia (Italy)
  6. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, US (United States)
  7. Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
22520232
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 149; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTRA; ASTROPHYSICS; BL LACERTAE OBJECTS; CATALOGS; GALAXIES; INFRARED SPECTRA; INFRARED SURVEYS; QUASARS; RED SHIFT; SOUTHERN HEMISPHERE; TELESCOPES