Volume 404, Number 1, June II 2003
|Page(s)||163 - 170|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||26 May 2003|
On the distribution of EGRET unidentified sources in the Galactic plane
Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521, USA
2 Riverside Community College, Riverside, CA 92506, USA
3 Dept. of Physics, Cukurova University, Adana, Turkey
4 Dept. pf Physics, Sharif University of Technology, Tehran, Iran
Corresponding author: D. Bhattacharya, email@example.com
Accepted: 10 March 2003
It has been suggested that young pulsars, with ages less than a million years, are possible counterparts of some of the Galactic unidentified gamma-ray sources detected by the EGRET instrument on-board the Compton Gamma Ray Observatory. In this work, we compare different aspects of the EGRET unidentified (EUI) source distribution in the Galactic plane with those of the pulsar distribution. An EUI source Log N–Log S analysis is presented and compared with the Galactic radio pulsar Log N–Log S distribution. A number of systematic effects that could introduce errors to the EGRET Log N–Log S relation are discussed. A two-point angular correlation analysis of the EUI sources and Galactic pulsars is performed. We find that the global distribution properties of the plane EUI sources do not follow those of the young pulsar population. We conclude that even though a fraction of the EUI sources may have young pulsar counterparts, the majority of them follow a distribution that is similar to the molecular cloud distribution in nearby spiral arms.
Key words: gamma rays: observations / stars: pulsars: general / ISM: clouds
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.