出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present radio results fromshort e-EVN (EuropeanVLBI network) observations of the counterpart
to IGR J20187+4041, a hard X-ray source projected against the g Cygni supernova remnant
(SNR). The brightest unidentified EGRET source 3EG J2020+4017 is also located in the g Cygni
region, though its relation to IGR J20187+4041 has not been well established yet. The e-EVN
observations were carried out following the AGILE detection of gamma-ray flaring activity in
the region. Our observations show that the radio counterpart to the IGR source has a compact
structure on the 10 mas scales that could be related to a compact object, but no radio flaring
activity has been observed. e-VLBIis a technique which makes it possible to image the structure
of radio sources at the highest angular resolution on a very short timescale.
