1 research outputs found
X-Ray and Radio Observations of Bright GeV Sources
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.Comment: 18 pages, 26 figures, To appear in the proceedings of the workshop:
"The Nature of the Unidentified Galactic Gamma-Ray Sources" held at INAOE,
Mexico, October 2000, (A.Carraminana, O. Reiner and D. Thompson,