ISOCAM observations of compact HII regions in the LMC

Details ISOCAM observations of compact HII regions in the LMC ISOCAM observations of compact HII regions in the LMC

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..873c&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 873

Computer Science

1

Massive Star Formation, Ultracompact Hii Regions, Magellanic Clouds

Scientific paper

ISOCAM images at 15 μm are presented of five fields in the Large Magellanic Cloud, suspected to contain ultracompact HII regions from the existence of IRAS point sources with typical colors of these objects. The dramatic improvement in angular resolution provided by ISOCAM has allowed us to identify true compact objects in some of the fields, and to assess the reliability of IRAS-based criteria. The resolution of ISOCAM at the distance of the Magellanic Clouds does not allow to discern between compact and ultracompact HII regions. However, comparison to aperture synthesis radio surveys can be used to discriminate between both kind of objects. In this way, we show that two of the three bright point sources seem indeed to be ultracompact. Our observations provide a first sample of objects suitable for studies of early stages of the life of massive stars in an environment of much lower metallicity than that of our Galaxy.

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