Class I methanol masers in low-mass star formation regions
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2012

Four Class I maser sources were detected at 44, 84, and 95 GHz toward chemically rich outflows in the regions of low-mass star formation NGC 1333I4A, NGC 1333I2A, HH25, and L1157. One more maser was found at 36 GHz toward a similar outflow, NGC 2023. Flux densities of the newly detected masers are no more than 18 Jy, being much lower than those of strong masers in regions of high-mass star formation. The brightness temperatures of the strongest peaks in NGC 1333I4A, HH25, and L1157 at 44 GHz are higher than 2000 K, whereas that of the peak in NGC 1333I2A is only 176 K. However, a rotational diagram analysis showed that the latter source is also a maser. The main properties of the newly detected masers are similar to those of Class I methanol masers in regions of massive star formation. The former masers are likely to be an extension of the latter maser population toward low luminosities of both the masers and the corresponding YSOs.


ISM: molecules


jets and outflows


S.V. Kalenskii

Russian Academy of Sciences

V.I. Slysh

Russian Academy of Sciences

Lars E B Johansson

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

Per Bergman

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

S. Kurtz

Universidad Nacional Autonoma de Mexico

P. Hofner

New Mexico Institute of Mining and Technology

National Radio Astronomy Observatory Socorro

C.M. Walmsley

Osservatorio Astrofisico di Arcetri

Proceedings of the International Astronomical Union

1743-9213 (ISSN) 1743-9221 (eISSN)

Vol. 8 S287 161 - 165


Astronomi, astrofysik och kosmologi


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