Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-27
Astronomy and Astrophysics
Astrophysics
18 pages, 26 figures, To appear in the proceedings of the workshop: "The Nature of the Unidentified Galactic Gamma-Ray Sources
Scientific paper
We present X-ray and radio studies of sources which are brightabove 1 GeV (F_{>1GeV} > 4e-8 ph/cm^2/s. Only 11 out of ~30 of these gamma-ray sources have been identified with lower energy counterparts: 5 blazars and 6 pulsars. Three of these pulsars are surrounded by radio pulsar wind nebulae (PWN), two of which are also seen as bright, extended X-ray synchrotron nebulae. The ASCA X-ray telescope has observed 28 of the bright GeV sources, revealing an excess of F_{2-10keV} > 10e-12 ergs/cm^2/s sources within the {\it EGRET} error contours of the unidentified sources. Although several supernova remnants are positionally coincident with these sources, we find no X-ray evidence of high energy particle production in SNR shell shocks consistent with the GeV positions. We also present initial results from follow on radio imaging studies of several fields containing unidentified sources. We have discovered new X-ray/radio nebulae in three of these fields which are strong candidates for PWN. These sources, along with a similar nebula in CTA 1 and the PWN around PSR B1853+01 in W44, are all positionally coincident with variable EGRET sources. This suggests a class of variable gamma-ray sources associated with synchrotron emitting regions powered by the winds of young pulsars.
Gaensler Bryan M.
Johnston Simon
Kawai Nobuyuki
Roberts Mallory S. E.
Romani Roger W.
No associations
LandOfFree
X-Ray and Radio Observations of Bright GeV Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with X-Ray and Radio Observations of Bright GeV Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-Ray and Radio Observations of Bright GeV Sources will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-563063