The SEDIGISM survey: a search for molecular outflows

Abstract

Context. The formation processes of massive stars are still unclear but a picture is emerging involving accretion disks and molecular outflows in what appears to be a scaled-up version of low-mass star formation. A census of outflow activity towards massive star-forming clumps in various evolutionary stages has the potential to shed light on massive star formation (MSF). Aims. We conducted an outflow survey towards ATLASGAL clumps using SEDIGISM data and aimed to obtain a large sample of clumps exhibiting outflows in different evolutionary stages. Methods. We identify the high-velocity wings of the 13CO lines toward ATLASGAL clumps by (1) extracting the simultaneously observed 13CO and C18O spectra from SEDIGISM, and (2) subtracting Gaussian fits to the scaled C18O from the 13CO, line after considering opacity broadening. Results. We have detected high-velocity gas towards 1192 clumps out of a total sample of 2052, giving an overall detection rate of 58%. Outflow activity has been detected in the earliest quiescent clumps (i.e., 70$\mu$m weak), to the most evolved HII region stages i.e., 8$\mu$m bright with MSF tracers. The detection rate increases as a function of evolution (quiescent=51%, protostellar=47%, YSO=57%, UCHII regions=76%). Conclusion. Our sample is the largest outflow sample identified so far. The high-detection rate from this large sample is consistent with previous results and supports that outflows are a ubiquitous feature of MSF. The lower detection rate in early evolutionary stages may be due to that outflows in the early stages are weak and difficult to detect. We obtain a statistically significant sample of outflow clumps for every evolutionary stage, especially for outflow clumps in the 70$\mu$m dark stage. This suggests that the absence of 70$\mu$m emission is not a robust indicator of starless/pre-stellar cores.

13 pages, 10 figures, accepted by Astronomy & Astrophysics (A&A)

References in corpus (29)

• ATLASGAL --- properties of a complete sample of Galactic clumps
• Three-dimensional simulation of massive star formation in the disk accretion scenario
• The 6-GHz Multibeam Maser Survey I. Techniques
• A hot compact dust disk around a massive young stellar object
• ATLASGAL --- Complete compact source catalogue: 280\degr\ $<\ell <$ 60\degr
• ATLASGAL-selected massive clumps in the inner Galaxy III. Dust Continuum Characterization of an Evolutionary Sample
• The SEDIGISM survey: first data release and overview of the Galactic structure
• ATLASGAL -- Evolutionary trends in high-mass star formation
• Accurate water maser positions from HOPS
• Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16
• Formation and Evolution of Disks around Young Stellar Objects
• The SEDIGISM survey: Molecular clouds in the inner Galaxy
• Optical Depth Estimates and Effective Critical Densities of Dense Gas Tracers in the Inner Parts of Nearby Galaxy Discs
• The almost ubiquitous association of 6.7 GHz methanol masers with dust
• Methanol Maser Associated Outflows: Detection statistics and properties
• Spiral arms and instability within the AFGL 4176 mm1 disc
• Massive molecular outflows associated with UCHII/HII regions
• ALMA Observations of Orion Source I at 350 and 660 GHz
• An Asymmetric Keplerian Disk Surrounding the O-type Protostar IRAS16547$-$4247
• A population of hypercompact HII regions identified from young HII regions
• Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
• SEDIGISM-ATLASGAL: Dense Gas Fraction and Star Formation Efficiency Across the Galactic Disk
• Molecular outflows around high-mass young stellar objects
• Occurrence Frequency of CO Outflows in Massive Protostellar Candidates
• Confirming the Explosive Outflow in G5.89 with ALMA
• A 10-$M_{\odot }$ YSO with a Keplerian disk and a nonthermal radio jet
• ATLASGAL -- Relationship between dense star forming clumps and interstellar masers
• On the Beam Filling Factors of Molecular Clouds
• ALMA Observations of the massive molecular outflow G331.512-0.103 II: physical properties, kinematics, and geometry modeling

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• Dependence of Molecular Cloud Samples on Angular Resolution, Sensitivity, and Algorithms
• SiO Outflows in the Most Luminous and Massive Protostellar Sources of the Southern Sky
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• High-Mass Starless Clumps: Dynamical State and Correlation Between Physical Parameters
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• A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?
• Turbulent Pressure Heats Gas and Suppresses Star Formation in Galactic Bar Molecular Clouds
• Ionized filaments and ongoing physical processes in massive star-forming sites around l = 345.5 degree
• Velocity-resolved high-J CO emission from massive star-forming clumps
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• Star Formation at the Periphery of a Molecular Superbubble: The Case of G12.79+0.43