HESS J1507-622: an unique unidentified source off the Galactic Plane
Abstract
Galactic very high energy (VHE, > 100 GeV) gamma ray sources in the inner Galaxy H.E.S.S. survey tend to cluster within 1 degree in latitude around the Galactic plane. HESS J1507-622 instead is unique, since it is located at latitude of ~3.5 degrees. HESS J1507-622 is slightly extended over the PSF of the instrument and hence its Galactic origin is clear. The search for counterparts in other wavelength regimes (radio, infrared and X-rays) failed to show any plausible counterparts; and given its position off the Galactic plane and hence the absorption almost one order of magnitude lower, it is very surprising to not see any counterparts especially at X-rays wavelengths (by ROSAT, XMM Newton and Chandra). Its latitude implies that it is either rather close, within about 1 kpc, or is located well off the Galactic plane. And also the models reflect the uniqueness of this object: a leptonic PWN scenario would place this source due to its quite small extension to multi-kpc distance whereas a hadronic scenario would preferentially locate this object at distances of < 1 kpc where the density of target material is higher.
Keywords
Cite
@article{arxiv.0912.4229,
title = {HESS J1507-622: an unique unidentified source off the Galactic Plane},
author = {O. Tibolla and W. Domainko and W. Hofmann and O. de Jager and S. Kaufmann and N. Komin and K. Kosack},
journal= {arXiv preprint arXiv:0912.4229},
year = {2019}
}