Publication Date:
2016-03-03
Description:
We report the results from a detailed -ray investigation in the field of two ‘dark accelerators’, HESS J1745–303 and HESS J1741–302, with 6.9 yr of data obtained by the Fermi Large Area Telescope. For HESS J1745–303, we found that its MeV–GeV emission is mainly originated from the ‘Region A’ of the TeV feature. Its -ray spectrum can be modelled with a single power law with a photon index of ~ 2.5 from few hundreds MeV–TeV. Moreover, an elongated feature, which extends from ‘Region A’ towards north-west for ~1 $_{.}^{\circ}$ 3, is discovered for the first time. The orientation of this feature is similar to that of a large-scale atomic/molecular gas distribution. For HESS J1741–302, our analysis does not yield any MeV–GeV counterpart for this unidentified TeV source. On the other hand, we have detected a new point source, Fermi J1740.1–3013, serendipitously. Its spectrum is apparently curved which resembles that of a -ray pulsar. This makes it possibly associated with PSR B1737–20 or PSR J1739–3023.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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