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HESS J1943+213, a TeV point source close to the Galactic plane recently discovered by the H.E.S.S. Collaboration, was proposed to be an extreme BL Lacertae object, though a pulsar wind nebula (PWN) nature could not be completely discarded. To investigate its nature, we performed high-resolution radio observations with the European Very Long Baseline Interferometry Network (EVN) and reanalyzed archival continuum and H_I data. The EVN observations revealed a compact radio counterpart of the TeV source. The low brightness temperature and the resolved nature of the radio source are indications against the beamed BL Lacertae hypothesis. The radio/X-ray source appears immersed in a ~1' elliptical feature, suggesting a possible galactic origin (PWN nature) for the HESS source. We found that HESS J1943+213 is located in the interior of a ~1° diameter H_I feature and explored the possibility of them being physically related.

Item Type:	Refereed Article
Keywords:	ISM, supernova remnants - radio continuum, general - radio lines, ISM - techniques, interferometric - X-rays, individuals
Research Division:	Physical Sciences
Research Group:	Astronomical sciences
Research Field:	Galactic astronomy
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the physical sciences
UTAS Author:	Pidopryhora, Y (Dr Yurii Pidopryhora)
ID Code:	95766
Year Published:	2013
Web of Science® Times Cited:	8
Deposited By:	Mathematics and Physics
Deposited On:	2014-10-08
Last Modified:	2015-02-07
Downloads:	472 View Download Statistics