期刊
ASTROPHYSICAL JOURNAL
卷 725, 期 1, 页码 17-28出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/725/1/17
关键词
H II regions; ISM: individual objects (W33A); stars: formation
资金
- SAO
- ASIAA
- Association of Universities for Research in Astronomy, Inc. under NSF [AF002, AST-9613615]
- Fundacion Andes [C-13442]
- NRAO [GSSP06-0015, GSSP08-0031]
Interferometric observations of the W33A massive star formation region, performed with the Submillimeter Array and the Very Large Array at resolutions from 5 '' (0.1 pc) to 0 ''.5 (0.01 pc), are presented. Our three main findings are: (1) parsec-scale, filamentary structures of cold molecular gas are detected. Two filaments at different velocities intersect in the zone where the star formation is occurring. This is consistent with triggering of the star formation activity by the convergence of such filaments, as predicted by numerical simulations of star formation initiated by converging flows. (2) The two dusty cores (MM1 and MM2) at the intersection of the filaments are found to be at different evolutionary stages, and each of them is resolved into multiple condensations. MM1 and MM2 have markedly different temperatures, continuum spectral indices, molecular-line spectra, and masses of both stars and gas. (3) The dynamics of the hot-core MM1 indicates the presence of a rotating disk in its center (MM1-Main) around a faint free-free source. The stellar mass is estimated to be similar to 10 M-circle dot. A massive molecular outflow is observed along the rotation axis of the disk.
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