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.
bipolar
ISM: jets and outflows
radio
hh 24-26
young stellar objects
driven molecular outflow
ISM: molecules
ngc 1333
masers
emission
lines: ISM
ISM: clouds
co outflows
cloud core
jet-driven
bok globules
outflows
Author
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 Autónoma de México
P. Hofner
Max Planck Society
National Radio Astronomy Observatory
New Mexico Institute of Mining and Technology
C. M. Walmsley
Arcetri Astrophysical Observatory
V. I. Slysh
Chalmers, Department of Radio and Space Science, National Facility for Radio Astronomy
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 405 1 613-620Subject Categories (SSIF 2011)
Physical Sciences
Roots
Basic sciences
DOI
10.1111/j.1365-2966.2010.16484.x