From the Convergence of Filaments to Disk-Outflow Accretion: Massive-Star Formation in W33A

Details From the Convergence of Filaments to Disk-Outflow Accretion: Massive-Star Formation in W33A From the Convergence of Filaments to Disk-Outflow Accretion: Massive-Star Formation in W33A

2010-04-14

arxiv.org/abs/1004.2466v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

ApJ in press, discussion extended, document matching final journal version

Scientific paper

Interferometric observations of the W33A massive star-formation region, performed with the Submillimeter Array (SMA) and the Very Large Array (VLA) at resolutions from 5 arcsec (0.1 pc) to 0.5 arcsec (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 approximately 10 Msun. A massive molecular outflow is observed along the rotation axis of the disk.

Affiliated with

Also associated with

No associations

Rating

From the Convergence of Filaments to Disk-Outflow Accretion: Massive-Star Formation in W33A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with From the Convergence of Filaments to Disk-Outflow Accretion: Massive-Star Formation in W33A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and From the Convergence of Filaments to Disk-Outflow Accretion: Massive-Star Formation in W33A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-528356