Issue |
Astron. Astrophys. Suppl. Ser.
Volume 118, Number 2, August 1996
|
|
---|---|---|
Page(s) | 191 - 226 | |
DOI | https://doi.org/10.1051/aas:1996190 | |
Published online | 15 August 1996 |
Studies of dense molecular cores in regions of massive star formation. IV. Multitransition CS-study towards*
Helsinki University Observatory, Tähtitorninmäki, P.O. Box 14, SF-00014 University of Helsinki, Finland
Received:
25
September
1995
Accepted:
19
December
1995
We have observed CS and C34S emission towards 33 H2O
maser positions in the southern sky () using
the SEST telescope. Most of the sources were selected also for
their association with strong IRAS sources. CS(2-1) was
detected in all sources, with the possible exception of two.
Most sources were also mapped in the transitions CS(5-4) and
C34S(2-1) and half of the sample also in CS(2-1). CS
and C34S transitions
were measured
towards the centres of the clouds as determined from the
mapping. CS and C34S transitions
were measured in
about a half dozen clouds. CO(1-0) was measured in most clouds
in order to determine the kinetic temperatures. The CS column
densities were calculated using the LTE approximation. All
measurements were also analyzed using a spherical LVG model. We
present the observational data and the results of this
analysis.
Key words: masers / stars: formation / ISM: clouds / ISM: molecules / radio lines: ISM
© European Southern Observatory (ESO), 1996