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

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.

24 pages, 9 figures, Accepted to ApJ

References in corpus (4)

• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• The Ionization of Accretion Flows in High Mass Star Formation: W51e2
• The Possibly Remnant Massive Outflow in G5.89-0.39: I - Observations and Initial MHD Simulations
• An optical spectroscopic H-R diagram for low-mass stars and brown dwarfs in Orion

Cited by in corpus (5)

• A Class I and Class II Methanol Maser Survey of Extended Green Objects (EGOs) from the GLIMPSE Survey
• Star Formation in Self-Gravitating Turbulent Fluids
• In search of infall motion in molecular clumps III: HCO+ (1-0) and H13CO+ (1-0) mapping observations toward the confirmed infall sources
• A Catalog of Molecular Clumps and Cores with Infall Signatures
• Redshifted methanol absorption tracing infall motions of high-mass star formation regions