Star formation in W49A - Gravitational collapse of the molecular cloud core toward a ring of massive stars

Details Star formation in W49A - Gravitational collapse of the molecular cloud core toward a ring of massive stars Star formation in W49A - Gravitational collapse of the molecular cloud core toward a ring of massive stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...238.1550w&link_type=abstract

Science (ISSN 0036-8075), vol. 238, Dec. 11, 1987, p. 1550-1555.

Astronomy and Astrophysics

Astronomy

110

Gravitational Collapse, Molecular Clouds, Star Formation, Astronomical Maps, Formyl Ions, Hydrogen Clouds, Interstellar Magnetic Fields, Radio Astronomy, Rotating Disks, Shock Waves, Very Large Array (Vla)

Scientific paper

High-resolution molecular line and continuum radio images from the Hat Creek Radio Observatory and the Very Large Array suggest that the core of the W49A star-forming region is undergoing gravitational collapse. The radio continuum shows a 2-parsec ring of at least ten distinct ultracompact H II regions, each associated with at least one O star. The ring is a region of large-scale, organized massive star formation. Recombination line velocities and HCO+ excitation requirements indicate that the ring is rotating around 50,000 solar masses of material. Because the HCO+ (1-0) line shows red-shifted absorption but blue-shifted emission, the molecular cloud core is believed to be collapsing toward the center of the ring. The HCO+ radial velocities, as well as H I, H2CO, and magnetic-field measurements, fit a simple model of inside-out gravitational collapse of a once magnetically supported cloud.

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