HESS J1507-622: an unique unidentified source off the Galactic Plane

Details HESS J1507-622: an unique unidentified source off the Galactic Plane HESS J1507-622: an unique unidentified source off the Galactic Plane

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...56t&link_type=abstract

XMM-Newton Proposal ID #06516201

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Hessj 1507-622

Scientific paper

Galactic VHE gamma-ray sources in the inner Galaxy H.E.S.S. survey cluster within 1 deg in latitude around the Galactic plane. HESS J1507-622 instead is unique, since located at latitude of -3.5 degrees. No plausible counterparts have been detected; and, given its position and hence the absorption almost one order of magnitude lower, it is very surprising to not see any counterparts especially at X-rays. Its latitude implies that it is either within about 1 kpc or is located well off the Galactic plane. The models reflect the uniqueness of this object: a leptonic scenario would locate the source at very large distan- ces, while it would be very close in hadronic scenarios. The high sensitivity of XMM-Newton will shed light on the nature of this mysterious source.

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