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.

young stellar objects

bok globules

bipolar

ISM: jets and outflows

outflows

cloud core

ngc 1333

driven molecular outflow

jet-driven

lines: ISM

ISM: clouds

co outflows

radio

emission

hh 24-26

masers

ISM: molecules

Författare

S. V. Kalenskii

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

Max Planck-institutet

New Mexico Institute of Mining and Technology

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. 405 613-620

Ämneskategorier

Fysik

Fundament

Grundläggande vetenskaper

DOI

10.1111/j.1365-2966.2010.16484.x