The Sizes of the 1720 MHz OH Masers in Supernova Remnant IC 443

Details The Sizes of the 1720 MHz OH Masers in Supernova Remnant IC 443 The Sizes of the 1720 MHz OH Masers in Supernova Remnant IC 443

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.8217h&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #82.17; Bulletin of the American Astronomical Society, Vol. 32, p.1542

Astronomy and Astrophysics

Astronomy

Scientific paper

Two observations of the 1720\ MHz maser emission from the OH molecule in the supernova remnant IC 443 (G189.1+3.0) are discussed. We present separate results from the VLBA + phased VLA and from six antennas of the MERLIN radio telescope array. The MERLIN array was able to resolve some of the maser emission regions showing imaged sizes of 115\ mas < θ < 230\ mas. The visibility data from the VLBA + phased VLA indicate sources sizes { ~}180\ mas. Since interstellar image scatter-broadening is expected to be minimal towards IC 443, near the Galactic anticenter, these measured sizes are likely the intrinsic sizes of the maser regions. Based on the assumption that the IC 443 OH sources are not scatter-broadened at the relatively small distance of 1.5\ kpc, these data are the the most reliable determination of the intrinsic size of OH (1720\ MHz) masers in supernova remnants. These measurements indicate that 1720\ MHz OH maser regions in supernova remnants have, in general, linear sizes approaching { ~}300\ AU. This research was supported by the National Radio Astronomy Observatory (NRAO) summer student program. The NRAO is a facility of the National Science Foundation and is operated by Associated Universities, Inc. under contract.

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