Compact radio sources in the vicinity of the ultracompact HII region G78.4+2.6

Details Compact radio sources in the vicinity of the ultracompact HII region G78.4+2.6 Compact radio sources in the vicinity of the ultracompact HII region G78.4+2.6

2010-06-19

arxiv.org/abs/1006.3896v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in RevMexAA, vol. 46, 2010

Scientific paper

Using the Very Large Array (VLA) at 3.6~cm we identify four new compact radio sources in the vicinity of the cometary HII region G78.4+2.6 (VLA~1). The four compact radio sources (named VLA~2 to VLA~5), have near-infrared counterparts, as seen in the 3.6 $\mu$m Spitzer image. One of them (VLA~5) clearly shows evidence of radio variability in a timescale of hours. We explore the possibility that these radio sources are associated with pre-main sequence (PMS) stars in the vicinity of the UC HII region G78.4+2.6. Our results favor the smaller distance value of 1.7 kpc for G78.4+2.6. In addition to the detection of the radio sources in the vicinity of G78.4+2.6, we detected another group of five sources which appear located about 3' to the northwest of the HII region. Some of them exhibit extended emission.

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