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The ROSAT/NVSS AGN sample

Published online by Cambridge University Press:  25 July 2014

Gurgen M. Paronyan ,
Hayk V. Abrahamyan ,
Gohar S. Harutyunyan  and
Areg M. Mickaelian
Gurgen M. Paronyan
Affiliation:
Byurakan Astrophysical Observatory (BAO), Byurakan 0213, Aragatzotn province, Armenia Email: [email protected], [email protected], [email protected], [email protected]
Hayk V. Abrahamyan
Affiliation:
Byurakan Astrophysical Observatory (BAO), Byurakan 0213, Aragatzotn province, Armenia Email: [email protected], [email protected], [email protected], [email protected]
Gohar S. Harutyunyan
Affiliation:
Byurakan Astrophysical Observatory (BAO), Byurakan 0213, Aragatzotn province, Armenia Email: [email protected], [email protected], [email protected], [email protected]
Areg M. Mickaelian
Affiliation:
Byurakan Astrophysical Observatory (BAO), Byurakan 0213, Aragatzotn province, Armenia Email: [email protected], [email protected], [email protected], [email protected]
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Abstract

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We attempt to create an X-ray/radio AGN catalog and make its multiwavelength studies. ROSAT Bright Source Catalogue (BSC) contains 18,806 and ROSAT Faint Source Catalogue (FSC), 105,922 X-ray sources giving the total number of ROSAT X-ray sources 124,727 (one source is listed twice). On the other hand, NVSS radio catalogue contains 1,773,484 sources. Taking into account that X-ray sources contain AGN, bright stars and galaxies, clusters, white dwarfs (WD), cataclysmic variables (CV), etc., the cross-identification with radio catalogue may distinguish the extragalactic sources. We have cross-correlated ROSAT catalogs with NVSS one with a search radius 30 arcsec. 9,193 associations have been found. To distinguish AGN from the normal bright galaxies and clusters, Veron-Cetty & Veron AGN catalog (v.13, 2010; VCV-13) containing 168,940 objects have been used. A cross-correlation of the 9,193 ROSAT/NVSS sources with the VCV-13 with a search radius 30 arcsec resulted in 3,094 associations. Thus we are left with more 6,099 X-ray/radio sources without an optical identification. Brighter objects are normal bright galaxies, while we believe that all faint ones are candidate AGN with some contamination of distant clusters. SDSS spectroscopic survey allows us classify objects by activity types, and a number of our candidate AGN is found to be present in SDSS. We attempt to find connections between the fluxes in different wavelength ranges, which will allow us to confirm AGN and blazars candidates and in some cases find new ones.

Keywords

X-ray and radio surveysSDSScross-correlationsAGNAGN candidates
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 164 - 165
Copyright
Copyright © International Astronomical Union 2014 

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