e-MERLIN observations of the puzzling TeV source HESS J1943+213

Gabányi, Krisztina Éva and Dubner, G. and Giacani, E. and Frey, Sándor and Paragi, Z. (2015) e-MERLIN observations of the puzzling TeV source HESS J1943+213. POS - PROCEEDINGS OF SCIENCE, EVN 20. ISSN 1824-8039

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Abstract

HESS J1943+213 is a TeV source close to the Galactic plane proposed to be a BL Lac object. Our high resolution EVN observation failed to recover two thirds of the source flux density detected simultaneously by the WSRT. Our recent e-MERLIN observations in L and C bands show only a point source with flux density comparable to the EVN detection. Thus the structure responsible for the missing flux density has to be larger than 2′′. It may be related to the presumed extragalac- tic source (thus would have a kpc-scale size), or to the Galactic foreground material close to the line of sight to the source.

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