1112.2655 (D. A. Denis et al.)
D. A. Denis, W. W. Tian
The H.E.S.S. collaboration (Abramowski et al. 2011) dicovered a new a 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. Gabanyi et al. (2011) argue it is a PWN
TeV source based on the radio counterpart's lower brightness than expected from
a high-frequency peak BL Lac object and their inferred HI absorption distance
of $\sim$ 11.5 kpc in the Galaxy. However, we have analyzed the same archival
data to obtain a reliable HI absorption spectrum and find a different distance
of $\ge$ 17 kpc. This result disarms Gabanyi et al. (2011)'s conclusion and
strongly supports that HESS J1943+213 is an extragalactic source, consistent
with preferred counterpart of the HESS collaboration.
View original:
http://arxiv.org/abs/1112.2655
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