Further observations of the peculiar galactic radio source BG2107+49

Details Further observations of the peculiar galactic radio source BG2107+49 Further observations of the peculiar galactic radio source BG2107+49

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...181..351h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 181, no. 2, July 1987, p. 351-364.

Astronomy and Astrophysics

Astronomy

10

H Ii Regions, Hydrogen Clouds, Nebulae, Radio Sources (Astronomy), Interstellar Matter, Star Formation, Stellar Winds

Scientific paper

The peculiar 'comet-shaped' radio source BG2107+49 (G19.11+1.58) has been observed with the Very Large Array, the Westerbork Synthesis Radio Telescope, and the NRAO 43-m telescope, in an attempt to determine its nature. These observations have determined its radio morphology at 1.4 GHz, and H I absorption data, in combination with H103-alpha recombination-line observations, have established that the radio source is about 11 kpc from the sun. The radio source consists of a compact 'head' H II region with an approximate diameter of 12 pc, out of which two 'tails'appear to emanate. The larger of these has a curved length of about 200 pc and is similar in appearance to some of the large shell structures in the Magellanic Clouds. No satisfactory model of the H II complex, which has a total mass in excess of 30,000 solar masses, has emerged from this investigation, although it is likely that the object is the result of several physical processes, including a stellar-wind shell and possibly secondary star formation. A red CCD exposure of the 'head' was obtained at the Canada-France-Hawaii Telescope as a guide for future searches for possible exciting stars.

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