Accurate positions of H2 O masers in the Large Magellanic Cloud

Details Accurate positions of H2 O masers in the Large Magellanic Cloud Accurate positions of H2 O masers in the Large Magellanic Cloud

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.331..969l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 331, Issue 4, pp. 969-974.

Astronomy and Astrophysics

Astronomy

20

Line: Profiles, Masers, Hii Regions, Ism: Molecules, Magellanic Clouds

Scientific paper

Positions with subarcsecond accuracy have been measured for seven 22-GHz H2 O masers associated with Hii regions in the Large Magellanic Cloud (LMC); two of the masers are new detections. Initial position measurements were obtained with the 70-m antenna of the Canberra NASA Deep Space Network during a period of more than two years in which the antenna was used to monitor the maser emission. The positions were further improved using 22-GHz observations involving three antennas of the Australia Telescope Compact Array. The positions have been compared with those of 1.6-GHz continuum emission and other LMC masers (of OH and CH3 OH). The H2 O maser positions range from within 1arcsec (270mpc) of the centre of a compact Hii component to beyond the boundary of significant continuum emission. Three of the four masers located near continuum peaks are close to OH masers. In two cases the positional agreement is better than 0.2arcsec (53mpc) in the third case the agreement is worse (0.9arcsec) but the positions of the individual H2 O features appear to be spread over more than 1arcsec. The velocities of the OH masers are within the spread of the H2 O velocities. The three H2 O masers offset from continuum centres are located 3-7arcsec from optical or infrared phenomena probably associated with very early stages of star formation; no other molecular masers are known in these directions.

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