Articulo
A systematic cross-search for radio/infrared counterparts of XMM-Newton sources
Registro en:
issn:0004-640X
issn:1572-946X
Autor
Combi, Jorge Ariel
Albacete Colombo, Juan Facundo
Pellizza, Leonardo J.
Lopez-Santiago, Javier
Romero, Gustavo Esteban
Martí, Josep
Muñoz-Arjonilla, A. J.
Sánchez-Ayaso, E.
Luque-Escamilla, Pedro L.
Sánchez-Sutil, Juan R.
Institución
Resumen
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. Facultad de Ciencias Astronómicas y Geofísicas Instituto Argentino de Radioastronomía