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Multi-wavelength selection and identification of gamma-ray blazar candidates

Published online by Cambridge University Press:  24 March 2015

Alessandro Paggi ,
R. D'Abrusco ,
F. Massaro ,
M. Landoni ,
D. Milisavljevic ,
N. Masetti ,
F. Ricci ,
E. Jiménez-Bailón ,
V. Chavushyan  and
M. Giroletti
...Show all authors
Alessandro Paggi
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
R. D'Abrusco
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
F. Massaro
Affiliation:
SLAC - National Laboratory and Kavli Institute for Particle Astrophysics and Cosmology 2575 Sand Hill Road, Menlo Park, CA 94025, USA
M. Landoni
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected] INAF - Osservatorio Astronomico di Brera Via Emilio Bianchi 46, I-23807 Merate, Italy
D. Milisavljevic
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
N. Masetti
Affiliation:
INAF - Istituto di Astrosica Spaziale e Fisica Cosmica di Bologna via Gobetti 101, 40129, Bologna, Italy
F. Ricci
Affiliation:
Dipartimento di Matematica e Fisica, Universit Roma Tre via della Vasca Navale 84, I-00146, Roma, Italy
E. Jiménez-Bailón
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México Apdo. Postal 877, Ensenada, 22800 Baja California, México
V. Chavushyan
Affiliation:
Instituto Nacional de Astrofísica, Óptica y Electrónica Apartado Postal 51-216, 72000 Puebla, México
M. Giroletti
Affiliation:
INAF - Istituto di Astrosica Spaziale e Fisica Cosmica di Bologna via Gobetti 101, 40129, Bologna, Italy
H. A. Smith
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
R. Margutti
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
G. Tosti
Affiliation:
Dipartimento di Fisica, Università degli Studi di Perugia 06123 Perugia, Italy
J. R. Martinéz-Galarza
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
H. Otí-Floranes
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México Apdo. Postal 877, Ensenada, 22800 Baja California, México
J. E. Grindlay
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, MA 02138, USA email: [email protected]
S. Funk
Affiliation:
SLAC - National Laboratory and Kavli Institute for Particle Astrophysics and Cosmology 2575 Sand Hill Road, Menlo Park, CA 94025, USA
C. C. Cheung
Affiliation:
Space Science Division, Naval Research Laboratory Washington, DC 20375-5352, USA
L. Chomiuk
Affiliation:
Department of Physics and Astronomy, Michigan State University East Lansing, MI 48824, USA
J. Strader
Affiliation:
Department of Physics and Astronomy, Michigan State University East Lansing, MI 48824, USA
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Abstract

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A significant fraction (~ 30%) of the gamma-ray sources detected by the Fermi Gamma-ray Space Telescope is still of unknown origin, being not yet associated with counterparts at lower energies. Many unidentified gamma-ray sources (UGSs) could be blazars, the largest identified population of extragalactic gamma-ray sources and the rarest class of active galactic nuclei. In particular, it has been found that blazars occupy a defined region in WISE three dimensional color space, well separated from that occupied by other sources in which thermal emission prevails. For farther sources with weaker IR emission, additional informations can be obtained combining WISE data with X-ray or radio emission. Alternatively, the low-frequency radio emission can be used for identifying potential gamma-ray candidate blazars. However, optical spectroscopic observations represent the tell-tale tool to confirm the exact nature of these sources. To this end, an extensive observational campaign has been performed with several optical telescopes, aimed at pinpointing the exact nature of gamma-ray candidate blazars selected with the different selection methods mentioned above. The results of this campaign lead to the discovery of 60 new gamma-ray blazars, thus confirming the effectiveness of these selection criteria.

Keywords

galaxies: activeBL Lacertae objects: generalgalaxies: jetsradio continuum: galaxiesinfrared: galaxiesX-rays: galaxiesgamma rays: observations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S313: Extragalactic jets from every angle , September 2014 , pp. 58 - 63
Copyright
Copyright © International Astronomical Union 2015 

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