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Astron. Astrophys. 348, 868-876 (1999)

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Unidentified 3EG gamma-ray sources at low galactic latitudes

G.E. Romero *  1, P. Benaglia[FORMULA]  1 and D.F. Torres 2

1 Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina
2 Departamento de Física, UNLP, C.C.67, (1900) La Plata, Buenos Aires, Argentina

Received 26 April 1999 / Accepted 21 June 1999

Abstract

We present a study on the possible association of unidentified [FORMULA]-ray sources in the Third EGRET (3EG) catalog with different types of galactic objects such as Wolf-Rayet and Of stars, supernova remnants (SNRs), and OB associations (considered as pulsar tracers). We have made use of numerical simulations of galactic populations of [FORMULA]-ray point sources in order to determine the statistical significance of the positional coincidences. New constraints on pure chance association are presented for SNRs and OB associations. There is overwhelming statistical support for the hypothesis that some SNRs are [FORMULA]-ray sources (we obtain probabilities of pure chance association [FORMULA]). OB star associations present higher, but still negligible probabilities ([FORMULA]). It is also shown that although massive stars present just marginally significant correlation with 3EG sources, there is a posteriori support for at least three candidates.

Key words: gamma rays: observations – stars: early-type – ISM: supernova remnants – stars: pulsars: general

* Member of CONICET

Send offprint requests to: G.E. Romero

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© European Southern Observatory (ESO) 1999

Online publication: August 13, 199
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