2003A&A...404..163B


Query : 2003A&A...404..163B

2003A&A...404..163B - Astronomy and Astrophysics, volume 404, 163-170 (2003/6-2)

On the distribution of EGRET unidentified sources in the Galactic plane.

BHATTACHARYA D., AKYUEZ A., MIYAGI T., SAMIMI J. and ZYCH A.

Abstract (from CDS):

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 LogN-LogS analysis is presented and compared with the Galactic radio pulsar LogN-LogS distribution. A number of systematic effects that could introduce errors to the EGRET LogN-LogS 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.

Abstract Copyright:

Journal keyword(s): gamma rays: observations - stars: pulsars: general - ISM: clouds

CDS comments: in ref list Bignami 1980ApJ...241.1161B instead of 1980, ApJ, 1161

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 3EG J0628+1847 gam 06 28 36.1 +18 50 35           ~ 9 0
2 3EG J0824-4610 gam 08 25 -46.2           ~ 8 1
3 3EG J0827-4247 gam 08 28 -42.8           ~ 8 1
4 SNR G284.3-01.8 Rad 10 18.3 -59 00           ~ 109 2
5 3EG J1639-4702 gam 16 40 30.0 -46 33 00           ~ 146 2
6 3FHL J1652.2-4633e Bz? 16 57 47.5 -45 20 18           ~ 26 1
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13453 0
8 2EG J1903+0529 gam 19 03 54.0 +05 31 17           ~ 29 1

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2023.02.04-10:47:41

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