The birth of HII regions

Details The birth of HII regions The birth of HII regions

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007atnf.prop.1122l&link_type=abstract

ATNF proposal C1751, Semester: October, 2007

Astronomy and Astrophysics

Astrophysics

Galactic, Atca

Scientific paper

Massive stars dominate changes in the galactic environment, driving both energy cycles and chemical enrichment. With such a disproportionate influence on the galactic ecology, the lack of a cohesive model of their formation process is therefore one of the major unsolved problems in stellar astrophysics. Development has been hampered by the paucity of sufficiently young sources with well constrained evolutionary stages. Through a detailed observational program we have previously isolated a sample of massive protostellar cores and now seek to pinpoint the state of evolution within these cores by unambiguously determining whether or not a massive star has formed within them. This can now be achieved through continuum observations to derive the properties of the ionised gas. Crucially, the addition of the 7mm upgrade now makes it significantly easier to detect the youngest, optically-thick sources which are likely to have been missed by the previous continuum surveys at frequencies ~8GHz.

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