[vsnet-campaign-xray 374] Re: LS 5039

[Taichi Kato]

    astro-ph version of the Sceince paper on LS 5039:

astro-ph/0508298

    Title: Discovery of very high energy gamma-rays associated with an X-ray
binary
    Authors: H.E.S.S. Collaboration: F. Aharonian, et al
    Comments: 9 pages, 3 figures (including Science Online Material).
    Journal-ref: Science 309, 746 (2005)

    X-ray binaries are composed of a normal star in orbit around a neutron
star or stellar-mass black hole. Radio and X-ray observations have led to
the presumption that some X-ray binaries called microquasars behave as
scaled down active galactic nuclei. Microquasars have resolved radio
emission that is thought to arise from a relativistic outflow akin to
active galactic nuclei jets, in which particles can be accelerated to large
energies. Very high energy gamma-rays produced by the interactions of these
particles have been observed from several active galactic nuclei. Using the
High Energy Stereoscopic System, we find evidence for gamma-ray emission
>100 GeV from a candidate microquasar, LS 5039, showing that particles are
also accelerated to very high energies in these systems.

(http://xxx.lanl.gov/abs/astro-ph/0508298)