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

被引：5
|
作者：
Leahy, D. A. [1 ]
Tian, W. W. [2 ]
机构：
[1] Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada
[2] CAS, Natl Astron Observ, Beijing 100012, Peoples R China
来源：
ASTRONOMY & ASTROPHYSICS | 2012年 / 539卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
methods: data analysis; ISM: supernova remnants; cosmic rays; RADIO;
D O I：
10.1051/0004-6361/201118633
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Context. The H.E.S.S. Collaboration 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. Aims. We measure the distance to the radio counterpart G57.76-1.29 of HESS J1943+213. Methods. We analyze Very Large Array observations to obtain a reliable HI absorption spectrum. Results. The resulting distance limit is >= 16 kpc. This distance strongly supports that HESS J1943+213 is an extragalactic source, consistent with the preferred counterpart of the H.E.S.S. Collaboration
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页数：2
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