Multiwavelength Study of two Unidentified γ-ray Sources

Author： Palombara Nicola Caraveo Patrizia Mignani Roberto Hatziminaoglou Evanthia Bignami Giovanni Schirmer Mischa

ISSN： 0004-640X

Source： Astrophysics and Space Science, Vol.297, Iss.1-4, 2005-06, pp. : 335-344

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Abstract

Most counterparts of the identified low-latitude γ-ray sources are isolated neutron stars (INSs). Since INSs are characterized by an extremely high value of f _X/f _opt, a systematic X-ray/optical coverage of the fields of unidentified low-latitude γ-ray sources is the best way to unveil INS counterparts of unidentified sources. Since the low-latitude sources are heavily affected by the interstellar absorption in both the X-ray and optical bands, we decided to apply the above strategy to two middle-latitude EGRET sources, which could belong to a local galactic population: 3EG J0616-3310 and 3EG J1249-8330. Here we report on the global X-ray characterization of about 300 objects, on their candidate optical counterparts and on the preliminary results of their identification.