SIMBAD references

2004ApJ...606..943S - Astrophys. J., 606, 943-951 (2004/May-2)

The case for local collapse in the W51 star-forming region.


Abstract (from CDS):

We present observations of the W51 high-mass star-forming region at 86 and 110 GHz made with the Berkeley-Illinois-Maryland Association (BIMA) array. The observations include the H13CO+(J=1⟶0), SiO(J=2⟶1,ν=0), SO2(81,7⟶80,8), SO2(83,5⟶92,8), 13CO(J=1⟶0), and C18O(J=1⟶0) lines. We compare the H13CO+(J=1⟶0) data to earlier work and find that these data support the hypothesis that infall in the W51 region is taking place in several localized regions, each involving on the order of 100 Mof gas. The data do not support the hypothesis that the collapse is global, involving tens of thousands Mof gas. We calculate dust masses for two dense cores containing ultra-compact H II regions and find that these masses are consistent with the localized infall model, being on the order of 100 M. We estimate gas column densities from the observations of CO and SO2and find them to be consistent with the other mass estimates, assuming abundances from other hot molecular cores.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Clouds - ISM: Kinematics and Dynamics - Radio Lines: ISM - Stars: Formation

Simbad objects: 14

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2004ApJ...606..943S and select 'bookmark this link' or equivalent in the popup menu