Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46...49s&link_type=abstract
Astronomy Reports, Volume 46, Issue 1, January 2002, pp.49-56
Astronomy and Astrophysics
Astronomy
13
Scientific paper
The results of a search for maser emission in the methanol lines 8-1-70 E at 229.8 GHz, 3-2-4-1 E at 230.0 GHz, 00-1-1 E at 108.9 GHz, and in the J 1-J 0 E series near 165 GHz in star-forming regions are reported. At least two masers and two candidates have been detected at 229.8 GHz. Thus, methanol masers have been detected in the 1-mm band for the first time. At 108.9 GHz, masers have been detected toward G345.01+1.79 and possibly toward M8E as well. Thermal emission was found toward 28 objects. The 229.8-GHz sources are class I masers, whereas the 108.9-GHz sources are class II masers. An analysis using a large velocity-gradient method shows that the 229.8-GHz masers can appear at densities of about 3×104 cm-3. The ratios of the flux densities in different class I lines toward DR 21(OH) and DR 21 West can be approximated in models with gas kinetic temperatures of about 50 K. Detection of the 108.9 GHz masers toward G345.01+1.79 and M8E may provide information about the geometry of these objects.
Kalenskii S. V.
Slysh Viacheslav I.
Val'tts Irina E.
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