The HI absorption distance of HESS J1943+213 favours its extragalactic nature

Details The HI absorption distance of HESS J1943+213 favours its extragalactic nature The HI absorption distance of HESS J1943+213 favours its extragalactic nature

2011-12-12

arxiv.org/abs/1112.2655v3

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

3 figures, 2 pages, A&A accepted

Scientific paper

The H.E.S.S. collaboration (Abramowski et al. 2011) dicovered a new TeV point-like source HESS J1943+213 in the Galactic plane and suggested three possible low-energy-band counterparts: a $\gamma$-ray binary, a pulsar wind nebula (PWN), or a BL Lacertae object. We measure the distance to the radio counterpart G57.76-1.29 of HESS J1943+213. We analyze Very Large Array observations to obtain a reliable HI absorption spectrum.The resulting distance limit is $\ge$ 16 kpc. This distance strongly supports that HESS J1943+213 is an extragalactic source, consistent with the preferred counterpart of the HESS collaboration.

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