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|Title:||Optical Spectroscopic Observations of γ-Ray Blazar Candidates. III. The 2013/2014 Campaign in the Southern Hemisphere||Authors:||LANDONI, Marco
Smith, H. A.
Cheung, C. C.
|Issue Date:||2015||Journal:||THE ASTRONOMICAL JOURNAL||Number:||149||Issue:||5||First Page:||1||Abstract:||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. <P />Based on observations obtained at the southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministério da Ciência, Tecnologia, e Inovação (MCTI) da República Federativa do Brasil, the U.S. National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU).||Acknowledgments:||This investigation is supported by the NASA grants NNX12AO97G and NNX13AP20G. H.A.S. acknowledges partial support from NASA/JPL grant RSAs 1369566, 1369556, and 1369565. The work by G. Tosti is supported by the ASI/INAF contract I/005/12/0 while work by C.C.C. at NRL is supported in part by NASA DPR S-15633-Y. We are grateful to Dr. S. Points for his help to schedule, prepare, and perform the SOAR observations. Part of this work is based on archival data, software, or online services provided by the ASI Science Data Center. This research has made use of data obtained from the high-energy Astrophysics Science Archive Research Center (HEASARC) provided by NASA’s Goddard Space Flight Center; the SIMBAD database operated at CDS, Strasbourg, France; and the NASA/IPAC Extragalactic Database (NED) operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The Molonglo Observatory site manager, Duncan Campbell-Wilson, and the staff, Jeff Webb, Michael White, and John Barry, are responsible for the smooth operation of Molonglo Observatory Synthesis Telescope (MOST) and the day-to-day observing programme of SUMSS. The SUMSS survey is dedicated to Michael Large whose expertise and vision made the project possible. MOST is operated by the School of Physics with the support of the Australian Research Council and the Science Foundation for Physics within the University of Sydney. This publication makes use of data products from the Wide-field Infrared Survey Explorer , which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has made use of the USNOFS Image and Catalogue Archive operated by the United States Naval Observatory, Flagstaff Station ( http://www.nofs.navy.mil/data/fchpix/ ). TOPCAT 16 16 http://www.star.bris.ac.uk/∼mbt/topcat/ (Taylor 2005 ) for the preparation and manipulation of the tabular data and the images.||URI:||http://hdl.handle.net/20.500.12386/23202||URL:||https://iopscience.iop.org/article/10.1088/0004-6256/149/5/163||ISSN:||0004-6256||DOI:||10.1088/0004-6256/149/5/163||Bibcode ADS:||2015AJ....149..163L||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Feb 24, 2021
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