Search for Class I methanol masers in low-mass star formation regions
Artikel i vetenskaplig tidskrift, 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.
co outflows
lines: ISM
cloud core
young stellar objects
ISM: jets and outflows
ISM: molecules
ngc 1333
emission
driven molecular outflow
radio
outflows
jet-driven
hh 24-26
bok globules
ISM: clouds
bipolar
masers
Författare
S. V. Kalenskii
Pn Lebedev Physics Institute, Russian Academy of Sciences
Lars E B Johansson
Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi
Per Bergman
Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi
S. Kurtz
Universidad Nacional Autonoma de Mexico
P. Hofner
National Radio Astronomy Observatory Socorro
New Mexico Institute of Mining and Technology
Max Planck Institut fur Radioastronomie
C. M. Walmsley
Osservatorio Astrofisico Di Arcetri
V. I. Slysh
Onsala Space Observatory
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 405 1 613-620Ämneskategorier (SSIF 2011)
Fysik
Fundament
Grundläggande vetenskaper
DOI
10.1111/j.1365-2966.2010.16484.x