Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004arep...48..834v&link_type=abstract
Astronomy Reports, vol. 48, Issue 10, p.834-839
Astronomy and Astrophysics
Astronomy
Scientific paper
An analysis of the flux densities of the 51-60 A + (6.7 GHz) and 20-3-1 E (12.2 GHz) class II methanol maser lines in a large and homogeneous sample of maser sources has been carried out. For convenience, the maser lines were divided into three groups: group I contains spectral features for the lines most prominent in the 51-60 A + (6.7 GHz) transition, group II contains spectral features for the lines strongest in the 20-3-1 E (12.2 GHz) transition, group III contains spectral features for which the velocities of the emission maxima of the two lines coincide. The same dependence was found for group II and group III: log S 6.7=(0.79±0.05)×log S 12.2+(0.79±0.05). The spectral features in group I do not obey this relation, and deviations from a linear dependence are considerably greater. It is suggested that methanol class II masers be divided into a subclass IIa, which has special conditions favoring 6.7 GHz masers, and a subclass IIb, which is comprised of the 12.2 GHz masers and those 6.7 GHz masers that necessarily accompany them under the same conditions.
Lyubchenko Yu. S.
Val'tts Irina E.
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