Gm. Larionov et al., Survey of bipolar outflows and methanol masers in the (CS)-S-32 (2-1) and (CS)-S-34 (2-1) lines in the Northern sky, ASTR AST SS, 139(2), 1999, pp. 257-275
A survey of 158 sources (bipolar outflows and methanol masers) was carried
out in the CS(2 - 1) and (CS)-S-34(2 - 1) lines to measure and compare dens
ities in a large number of bipolar outflows and in Class I and Class II met
hanol masers, both associated with and unrelated to bipolar outflows. The s
tatistical characteristics of the regions, forming Class I methanol masers
differ from those both in the centres of bipolar outflows and in the region
s forming Class II methanol masers. It is possible that physical conditions
in bipolar outflows are closer to physical conditions of Class II methanol
masers.