NDLI: A systematic cross-search for radio/infrared counterparts of XMM-Newton sources

Content Provider	Springer Nature Link
Author	Combi, J. A. Albacete Colombo, J. F. Pellizza, L. López Santiago, J. Romero, G. E. Martí, J. Muñoz Arjonilla, A. J. Sánchez Ayaso, E. Luque Escamilla, P. L. Sánchez Sutil, J. R.
Copyright Year	2010
Abstract	We present a catalog of cross-correlated radio, infrared and X-ray sources using a very restrictive selection criteria with an IDL-based code developed by us. The significance of the observed coincidences was evaluated through Monte Carlo simulations of synthetic sources following a well-tested protocol. We found 3320 coincident radio/X-ray sources with a high statistical significance characterized by the sum of error-weighted coordinate differences. For 997 of them, 2MASS counterparts were found. The percentage of chance coincidences is less than 1%. X-ray hardness ratios of well-known populations of objects were used to provide a crude representation of their X-ray spectrum and to make a preliminary diagnosis of the possible nature of unidentified X-ray sources. The results support the fact that the X-ray sky is largely dominated by Active Galactic Nuclei at high galactic latitudes (\|b\|≥10°). At low galactic latitudes (\|b\|≤10°) most of unidentified X-ray sources (∼94%) lie at \|b\|≤2°. This result suggests that most of the unidentified sources found toward the Milky Way plane are galactic objects. Well-known and unidentified sources were classified in different tables with their corresponding radio/infrared and X-ray properties. These tables are intended as a useful tool for researchers interested in particular identifications.
Starting Page	53
Ending Page	61
Page Count	9
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	331
Issue Number	1
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-08-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalogs Methods: statistical X-rays: general Radio continuum: general Infrared: general Surveys Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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