The almost ubiquitous association of 6.7 GHz methanol masers with dust

Abstract

We report the results of 870-$\mu$m continuum observations, using the Large APEX Bolometer Camera (LABOCA), towards 77 class-II, 6.7-GHz methanol masers identified by the Methanol Multibeam (MMB) survey to map the thermal emission from cool dust towards these objects. These data complement a study of 630 methanol masers associated with compact dense clumps identified from the ATLASGAL survey. Compact dust emission is detected towards 70 sources, which implies a dust-association rate of 99% for the full MMB catalogue. Evaluation of the derived dust and maser properties leads us to conclude that the combined sample represents a single population tracing the same phenomenon. We find median clump masses of a few 10${}^3$ M$\odot$ and that all but a handful of sources satisfy the mass-size criterion required for massive star formation. This study provides the strongest evidence of the almost ubiquitous association of methanol masers with massive, star-forming clumps. The fraction of methanol-maser associated clumps is a factor of ~2 lower in the outer Galaxy than the inner Galaxy, possibly a result of the lower metallicity environment of the former. We find no difference in the clump-mass and maser-luminosity distributions of the inner and outer Galaxy. The maser-pumping and clump-formation mechanisms are therefore likely to be relatively invariant to Galactic location. Finally, we use the ratio of maser luminosity and clump mass to investigate the hypothesis that the maser luminosity is a good indicator of the evolutionary stage of the embedded source, however, we find no evidence to support this.

Accepted by MNRAS. 17 pages, 17 figures and 5 tables. The full version of Figs. 3 and 5 are only available in electronic form of the journal while the full versions of Tables 1, 2 and 4 will only be available through CDS. A complete version of the paper is available on request

References in corpus (12)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• Cold Dark Clouds: The Initial Conditions for Star Formation
• The distance to the Orion Nebula
• The Large APEX Bolometer Camera LABOCA
• Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey
• ATLASGAL --- towards a complete sample of massive star forming clumps
• The 6-GHz Multibeam Maser Survey I. Techniques
• Milky Way Kinematics: Measurements at the Subcentral Point of the Fourth Quadrant
• ATLASGAL --- Complete compact source catalogue: 280\degr\ $<\ell <$ 60\degr
• A SCUBA imaging survey of ultracompact HII regions: The environments of massive star formation
• Star Formation in the Most Distant Molecular Cloud in the Extreme Outer Galaxy: A Laboratory of Star Formation in an Early Epoch of the Galaxy's Formation
• BoA: a versatile software for bolometer data reduction

Cited by in corpus (28)

• ATLASGAL-selected massive clumps in the inner Galaxy III. Dust Continuum Characterization of an Evolutionary Sample
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• The SEDIGISM survey: Molecular clouds in the inner Galaxy
• CMZoom: Survey Overview and First Data Release
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• First Parallax Measurements Towards a 6.7 GHz Methanol Maser with the Australian Long Baseline Array - Distance to G339.884-1.259
• The SEDIGISM survey: a search for molecular outflows
• A Global View on Star Formation: The GLOSTAR Galactic Plane Survey V. 6.7 GHz Methanol Maser Catalogue
• A global view on star formation: The GLOSTAR Galactic plane survey III. 6.7 GHz methanol maser survey in Cygnus X
• Complex organic molecules detected in twelve high-mass star-forming regions with Atacama Large Millimeter/submillimeter Array (ALMA)
• MALT-45: A 7mm survey of the southern Galaxy - II. ATCA follow-up observations of 44GHz class I methanol masers
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• The Evolutionary Status of Protostellar Clumps Hosting Class II Methanol Masers
• Beyond the Solar Circle $-$ Trends in Massive Star Formation Between the Inner and Outer Galaxy
• A global view on star formation: The GLOSTAR Galactic plane survey X. Galactic HII region catalog using radio recombination lines
• The physical parameters of clumps associated with class I methanol masers
• Gas kinematics around filamentary structures in the Orion B cloud
• Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079
• Probing the early phases of high mass star formation with 6.7 GHz methanol masers
• MAGMO: Polarimetry of 1720-MHz OH Masers towards Southern Star Forming Regions
• Carbon Chain Chemistry in Hot-Core Regions around Three Massive Young Stellar Objects Associated with 6.7 GHz Methanol Masers
• Characteristic scale of star formation. I. Clump formation efficiency on local scales
• Maser Flares Driven by Variations in Pumping and Background Radiation
• SCOTCH Search for Clandestine Optically Thick Compact HII regions II
• A New Search for Star Forming Regions in the Southern Outer Galaxy
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• Dust Temperature Profiles in Dense Cores Associated With Massive Star-Forming Regions