### Outflow and Infall in a Sample of Massive Star Forming Regions II: Large Scale KinematicsOutflow and Infall in a Sample of Massive Star Forming Regions II: Large Scale Kinematics

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 Author Klaassen, P. D. ♦ Wilson, C. D. Source arXiv.org Content type Text File Format PDF Date of Submission 2008-05-22 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Astronomy & allied sciences ♦ Physics Subject Keyword Astrophysics ♦ physics:astro-ph Abstract We present maps of seven sources selected from Klaassen & Wilson (2007a) in SiO (J=8-7) and HCO$^+$ and H$^{13}$CO$^+$ (J=4-3) which were obtained using HARP-B on the James Clerk Maxwell Telescope. We find that four out of our seven sources have infall signatures based on their HCO$^+$ emission profiles. From our maps, we have determined the extent of both the outflowing and infalling regions towards these sources, and constrained the amount of infalling and outflowing mass as well as the mass infall rate for each massive star forming region. From our SiO observations, we estimate the source luminosity required to shock the surroundings of these massive star forming regions and find luminosities similar to those of the HII regions themselves. We find that the ratio between our infall and outflow masses is less than one, suggesting high mass entrainment rates in the molecular outflows. We also find that the large scale molecular infall rate towards G10.6-0.4 is comparable to the small scale molecular infall rate found in previous studies. Description Comment: 24 pages, 9 figures, Accepted to ApJ Educational Use Research Learning Resource Type Article Page Count 24