Search for Class I methanol masers in low-mass star formation regions
Journal article, 2010

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(1)A+ at 44 GHz and 4(-1) - 3(0)E 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 1022 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 x1014 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.


cloud core

ISM: jets and outflows


young stellar objects

driven molecular outflow


ISM: clouds


hh 24-26


bok globules

co outflows

ISM: molecules

lines: ISM

ngc 1333



S. V. Kalenskii

Russian Academy of Sciences

Lars E B Johansson

Chalmers, Department of Radio and Space Science, National Facility for Radio Astronomy

Per Bergman

Chalmers, Department of Radio and Space Science, National Facility for Radio Astronomy

S. Kurtz

Universidad Nacional Autonoma de Mexico

P. Hofner

Max Planck Institute

New Mexico Institute of Mining and Technology

National Radio Astronomy Observatory Socorro

C. M. Walmsley

Arcetri Astrophysical Observatory

V. I. Slysh


Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 405 1 613-620

Subject Categories

Physical Sciences


Basic sciences



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