Search for Class I methanol masers in low-mass star formation regions

Abstract

A survey of young bipolar outflows in regions of low-to-intermediate-mass star formation has been carried out in two class I methanol maser transitions: 7_0-6_1A+ at 44 GHz and 4_{-1}-3_0E at 36 GHz. We detected narrow features towards NGC 1333I2A, NGC 1333I4A, HH25MMS, and L1157 at 44 GHz, and towards NGC 2023 at 36 GHz. Flux densities of the lines detected at 44 GHz are no higher than 11 Jy and the relevant source luminosities are about 10^{22} erg s{-1}, which is much lower than those of strong masers in high-mass star formation regions. No emission was found towards 39 outflows. All masers detected at 44 GHz are located in clouds with methanol column densities of the order of or larger than a few x 10^{14} cm$^{-2}. The upper limits for the non-detections are typically of the order of 3--5 Jy. Observations in 2004, 2006, and 2008 did not reveal any significant variability of the 44 GHz masers in NGC 1333I4A, HH25MMS, and L1157.

Accepted in Mon.Not.Roy.Astron.Soc; 9 pages, 2 figures, appendix

References in corpus (12)

• Which are the youngest protostars? Determining properties of confirmed and candidate Class0 sources by broad-band photometry
• Accurate rest frequencies of methanol maser and dark cloud lines
• SiO J=5--4 in the HH211 Protostellar Jet Imaged with the SMA
• Infall and Outflow around the HH 212 protostellar system
• The clumpy structure of the chemically active L1157 outflow
• Structure and dynamics of the class I young stellar object L1489 IRS
• Molecular CO outflows in the L1641-N cluster: kneading a cloud core
• The detection of Class I methanol masers towards regions of low-mass star formation
• CCS and NH3 emission associated with low-mass young stellar objects
• The near-infrared excitation of the HH211 protostellar outflow
• A sensitive survey for water maser emission towards Bok globules using the Robledo 70m antenna
• Anatomy of HH 111 from CO observations : a bow shock driven molecular outflow

Cited by in corpus (27)

• Confirmation of the exclusive association between 6.7-GHz methanol masers and high-mass star formation regions
• 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
• 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
• Detection of Class I Methanol (CH3OH) Maser Candidates in Supernova Remnants
• Detection of 36 GHz class I methanol maser emission towards NGCS253
• A 95 GHz Class I Methanol Maser Survey Toward A Sample of GLIMPSE Point Sources Associated with BGPS Clumps
• A catalog of 44 GHz methanol masers in massive star-forming regions. IV. The high-mass protostellar object sample
• The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)
• A search for 95 GHz class I methanol masers in molecular outflows
• 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
• Simultaneous observation of water and class I methanol masers toward class II methanol maser sources
• 84-GHz methanol masers, their relationship to 36-GHz methanol masers and their molecular environments
• 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
• Methanol Maser Emission from Galactic Center Sources with Excess 4.5 μm Emission
• Class I methanol masers in low-mass star formation regions
• Water and Methanol Maser Survey of Protostars in the Orion Molecular Cloud Complex
• The first high-resolution observations of 37.7-, 38.3- and 38.5-GHz methanol masers
• Water and Methanol Maser Activities in the NGC 2024 FIR 6 Region
• Unbiased water and methanol maser surveys of NGC 1333
• A 95 GHz Methanol Emission Survey Toward Eight Small Supernova Remnants
• Simultaneous 22 GHz Water and 44 GHz Methanol Masers Survey of Ultracompact HII Regions