EGRET Unidentified Sources and the Galactic Spiral Arms

Details EGRET Unidentified Sources and the Galactic Spiral Arms EGRET Unidentified Sources and the Galactic Spiral Arms

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..695m&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

Computer Science

Scientific paper

An unbiased and complete LogN-LogS relation sam- ples the source distribution for a specific source ge- ometry without the knowledge of the source lumi- nosity function or the distance. Based on such an analysis we show that EGRET unidentified (EUI) sources are very closely aligned with the Galactic spiral arms and specifically with the distribution of the giant molecular clouds. Furthermore, the lumi- nosity distribution of the unidentified sources show a two population Gaussian distribution. We find that a combined distribution of OB associations, SNR and superbubbles interacting with molecular clouds within the spiral arms are the most likely counter- parts of the unidentified sources. Key words: gamma rays: observations - general - ISM: clouds.

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