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New blazars from the cross-match of recent multi-frequency catalogs

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Abstract

Blazars are radio-loud active galactic nuclei well known for their non thermal emission spanning a wide range of frequencies. The Roma-BZCAT is, to date, the most comprehensive list of these sources. We performed the cross-match of several catalogs obtained from recent surveys at different frequencies to search for new blazars. We cross-matched the 1st Swift XRT Point Source catalog with the spectroscopic sample of the 9th Data Release of the Sloan Digital Sky Survey. Then, we performed further cross-matches with the catalogs corresponding to the Faint Images of the Radio Sky at Twenty cm survey and to the AllWISE Data release, focusing on sources with infrared colors similar to those of confirmed γ-ray blazars included in the Second Fermi-LAT catalog. As a result, we obtained a preliminary list of objects with all the elements needed for a proper blazar classification according to the prescriptions of the Roma-BZCAT. We carefully investigated additional properties such as their morphology and the slope of their spectral energy distribution in the radio domain, the features shown in their optical spectrum, and the luminosity in the soft X rays to exclude generic active galactic nuclei and focus on authentic blazar-like sources. At the end of our screening we obtained a list of 15 objects with firmly established blazar properties.

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Notes

  1. http://www.asdc.asi.it/bzcat4/.

  2. http://wise2.ipac.caltech.edu/docs/release/allwise/expsup.

  3. http://www.star.bris.ac.uk/~mbt/topcat/.

  4. http://www.astro.ucla.edu/~wright/CosmoCalc.html.

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Acknowledgements

The work is supported by the ASI grant I/004/ 11/0 and by the NASA grants NNX12AO97G and NNX13AP20G. R. D’Abrusco acknowledges the SI competitive research grant “A New Astro-Archeology Probe of the Merging Evolution of Galaxies” for support. R. D’Abrusco’s work was also partially supported by the Chandra X-ray Center (CXC), which is operated by the Smithsonian Astrophysical Observatory (SAO) under NASA contract NAS8-03060. The work by G. Tosti is supported by the ASI/INAF contract I/005/12/0. TOPCAT and SAOImage DS9 were used extensively in this work for the preparation and manipulation of the tabular data and the images. 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; 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. Part of this work is based on archival data, software or on-line services provided by the ASI Science Data Center. 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 work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, Max Planck Institute for Extraterrestrial Physics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University.

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Authors and Affiliations

  1. INAF-IASF Palermo, via U. La Malfa 153, 90146, Palermo, Italy

    A. Maselli, G. Cusumano, V. La Parola & A. Segreto

  2. Dipartimento di Fisica, Università degli Studi di Torino, via Pietro Giuria 1, 10125, Torino, Italy

    F. Massaro

  3. Yale Center for Astronomy and Astrophysics, Physics Department, Yale University, PO Box 208120, New Haven, CT, 06520-8120, USA

    F. Massaro

  4. Harvard-Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA, 02138, USA

    R. D’Abrusco

  5. Dipartimento di Fisica, Università degli Studi di Perugia, 06123, Perugia, Italy

    G. Tosti

  6. Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, 06123, Perugia, Italy

    G. Tosti

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  1. A. Maselli
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Maselli, A., Massaro, F., D’Abrusco, R. et al. New blazars from the cross-match of recent multi-frequency catalogs. Astrophys Space Sci 357, 141 (2015). https://doi.org/10.1007/s10509-015-2372-x

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