New 9.9-GHz methanol masers

Abstract

The Australia Telescope Compact Array (ATCA) has been used to make the first extensive search for the class I methanol masers at 9.9 GHz. In total, 48 regions of high-mass star formation were observed. In addition to masers in W33-Met (G12.80-0.19) and G343.12-0.06 (IRAS 16547-4247) which have already been reported in the literature, two new 9.9-GHz masers have been found towards G331.13-0.24 and G19.61-0.23. We have determined absolute positions (accurate to roughly a second of arc) for all the detected masers and suggest that some class I masers may be associated with shocks driven into molecular clouds by expanding HII regions. Our observations also imply that the evolutionary stage of a high-mass star forming region when the class I masers are present can outlast the stage when the class II masers at 6.7 GHz are detectable, and overlaps significantly with the stage when OH masers are active.

accepted for publication in MNRAS, 14 pages, 3 figures, 4 tables

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Cited by in corpus (44)

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• The 6-GHz methanol multibeam maser catalogue II: Galactic longitudes 6 to 20
• Southern class I methanol masers at 36 and 44 GHz
• A 95 GHz Class I Methanol Maser Survey Toward GLIMPSE Extended Green Objects (EGOs)
• Physical characteristics of bright Class I methanol masers
• A Water Maser and Ammonia Survey of GLIMPSE Extended Green Objects (EGOs)
• Abundant Methanol Masers but no New Evidence for Star Formation in GCM0.253+0.016
• Online Database of Class I Methanol Masers
• A Multi-Epoch, Simultaneous Water and Methanol Maser Survey toward Intermediate-Mass Young Stellar Objects
• 12.2-GHz methanol maser MMB follow-up catalogue - I. Longitude range 330 to 10 degrees
• A 6.7 GHz Methanol Maser Survey II. Low Galactic Latitudes
• A 7mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources
• First Interferometric Images of the 36 GHz Methanol Masers in the DR21 Complex
• The Protocluster G18.67+0.03: A Test Case for Class I Methanol Masers as Evolutionary Indicators for Massive Star Formation
• Detection of 36 GHz class I methanol maser emission towards NGCS253
• A Catalog of Methanol Masers in Massive Star-forming Regions. III. The Molecular Outflow Sample
• A 95 GHz Class I Methanol Maser Survey Toward A Sample of GLIMPSE Point Sources Associated with BGPS Clumps
• MALT-45: A 7 mm survey of the southern Galaxy - I. Techniques and spectral line data
• Detection of a methanol megamaser in a major-merger galaxy
• Parallaxes of 6.7-GHz Methanol Masers towards the G305.2 High-Mass Star Formation Region
• A catalog of 44 GHz methanol masers in massive star-forming regions. IV. The high-mass protostellar object sample
• A search for 95 GHz class I methanol masers in molecular outflows
• The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)
• High-velocity feature of the class I methanol maser in G309.38-0.13
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: 278 GHz Class I Methanol Masers
• A 6.7 GHz Methanol Maser Survey at High Galactic Latitudes
• The Radio Ammonia Mid-Plane Survey (RAMPS) Pilot Survey
• Detection of 36 GHz Class I Methanol Maser Emission Towards NGC 4945
• MALT-45: A 7mm survey of the southern Galaxy - II. ATCA follow-up observations of 44GHz class I methanol masers
• Testing maser-based evolutionary schemes: A new search for 37.7-GHz methanol masers
• Methanol Maser Emission from Galactic Center Sources with Excess 4.5 μm Emission
• Class I methanol masers in low-mass star formation regions
• The first high-resolution observations of 19.9-GHz methanol masers
• The relationship between Class I and Class II methanol masers at high angular resolution
• The physical parameters of clumps associated with class I methanol masers
• The first high-resolution observations of 37.7-, 38.3- and 38.5-GHz methanol masers
• MAGMO: Polarimetry of 1720-MHz OH Masers towards Southern Star Forming Regions
• Water and Methanol Maser Activities in the NGC 2024 FIR 6 Region
• Investigations of the Class I methanol masers in NGC 4945
• Probing the electron-to-proton mass ratio gradient in the Milky Way with class I methanol masers
• Detection of 84-GHz class I methanol maser emission towards NGC 253
• Disk-outflow models as applied to high mass star forming regions through methanol and water maser observations
• The Maser-Starburst connection in NGC253
• Simultaneous 22 GHz Water and 44 GHz Methanol Masers Survey of Ultracompact HII Regions