Infall and Outflow Motions towards a Sample of Massive Star Forming Regions from the RMS Survey

Abstract

We present the results of an outflow and infall survey towards a distance limited sample of 31 massive star forming regions drawn from the RMS survey. The presence of young, active outflows is identified from SiO (8-7) emission and the infall dynamics are explored using HCO${}^{+}$/H${}^{13}$CO${}^{+}$ (4-3) emission. We investigate if the infall and outflow parameters vary with source properties, exploring whether regions hosting potentially young active outflows show similarities or differences with regions harbouring more evolved, possibly momentum driven, "fossil" outflows. SiO emission is detected towards approximately 46% of the sources. When considering sources with and without an SiO detection (i.e. potentially active and fossil outflows respectively), only the ${}^{12}$CO outflow velocity shows a significant difference between samples, indicating SiO is more prevalent towards sources with higher outflow velocities. Furthermore, we find the SiO luminosity increases as a function of the Herschel 70$\mu$m to WISE 22$\mu$m flux ratio, suggesting the production of SiO is prevalent in younger, more embedded regions. Similarly, we find tentative evidence that sources with an SiO detection have a smaller bolometric luminosity-to-mass ratio, indicating SiO (8-7) emission is associated with potentially younger regions. We do not find a prevalence towards sources displaying signatures of infall in our sample. However, the higher energy HCO${}^{+}$ transitions may not be the best suited tracer of infall at this spatial resolution in these regions.

arXiv commentAccepted for publication in MNRAS

References in corpus (41)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Formation of Massive Stars from Turbulent Cores
• Clouds, filaments and protostars: the Herschel Hi-GAL Milky Way
• Competitive accretion in embedded stellar cluster
• High-Mass Star and Massive Cluster Formation in the Milky Way
• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• A Search for Infall Motions Toward Nearby Young Stellar Objects
• Dynamic star formation in the massive DR21 filament
• The earliest phases of high-mass star formation: a 3 square degree millimeter continuum mapping of Cygnus X
• The Red MSX Source Survey: the Massive Young Stellar Population of our Galaxy
• ATLASGAL --- towards a complete sample of massive star forming clumps
• SDC13 infrared dark clouds: Longitudinally collapsing filaments?
• HARP/ACSIS: A submillimetre spectral imaging system on the James Clerk Maxwell Telescope
• SiO line emission from C-type shock waves : interstellar jets and outflows
• A distance limited sample of massive molecular outflows
• Trigonometric parallaxes of star forming regions in the Sagittarius spiral arm
• Gravity drives the evolution of infrared dark hubs: JVLA observations of SDC13
• DR 21(OH): a highly fragmented, magnetized, turbulent dense core
• ATLASGAL-selected massive clumps in the inner Galaxy, II: Characterisation of different evolutionary stages and their SiO emission
• The earliest phases of high-mass star formation, as seen in NGC 6334 by \emph{Herschel}
• Outflow and Infall in a Sample of Massive Star Forming Regions
• VLA observations of ammonia in high-mass star formation regions
• Outflows, infall and evolution of a sample of embedded low-mass protostars. The William Herschel Line Legacy (WILL) survey
• Evolution and excitation conditions of outflows in high-mass star-forming regions
• SiO outflows in high-mass star forming regions: A potential chemical clock?
• SiO emission from low- and high-velocity shocks in Cygnus-X massive dense clumps
• Line Profiles of Cores within Clusters: II Signatures of Dynamical Collapse during High Mass Star Formation
• Multiple CO Outflows in Circinus: The Churning of a Molecular Cloud
• Initial phases of massive star formation in high infrared extinction clouds. II. Infall and onset of star formation
• A survey of SiO 5-4 emission towards outflows from low-luminosity protostellar candidates
• Automated reduction of submillimetre single-dish heterodyne data from the James Clerk Maxwell Telescope using ORAC-DR
• A distance limited sample of massive star forming cores from the RMS survey
• SiO excitation from dense shocks in the earliest stages of massive star formation
• Looking for outflow and infall signatures in high mass star forming regions
• A survey of SiO 5-4 emission towards outflows from massive young stellar objects
• Spectral Line Survey toward Young Massive Protostar NGC 2264 CMM3 in the 4 mm, 3 mm, and 0.8 mm Bands
• Submillimeter Array Observations of NGC 2264-C: Molecular Outflows and Driving Sources
• The JCMT dense gas survey of the Perseus Molecular Cloud
• Distance and proper motion measurement of water masers in Shapless 269 IRS 2w
• Discovery of Striking Difference of Molecular-Emission-Line Richness in the Potential Proto-Binary System NGC 2264 CMM3

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• Effects of infall and outflow on massive star-forming regions
• The evolution of the internal structure of massive star forming regions in the Milky Way as revealed by ALMA
• The onset of stellar multiplicity in massive star formation: A search for low-mass companions of massive young stellar objects with $L^{\prime }$-band adaptive optics imaging
• Multifrequency study of HH 137 and HH 138: Discovering new knots and molecular outflows with Gemini and APEX