Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..569l&link_type=abstract
Astronomy and Astrophysics, v.312, p.569-584
Astronomy and Astrophysics
Astrophysics
35
Interstellar Medium, Dust, Clouds: Individual (Lynds 1630), Stars: Formation Of
Scientific paper
In a search for isothermal pre-stellar cores and protostars we surveyed with SEST and IRAM MRT part of the Orion B GMC for its λ1.3mm dust emission. We used the CS(2-1) survey by Lada et al. (1991a; LBS) as a search list. We determine the morphology of the detected cloud cores with angular resolutions of 23" (SEST) and 12", respectively. About one half of these cores have a compact core surrounded by an extended envelope. The λ1.3mm dust emission maps were compared with NIR (2.13 μm) and FIR (IRAS) maps to discriminate between isothermal and self-luminous cores. About one half of the cores were classified as isothermal. A comparison of virial masses derived from CS line widths with gas masses derived from λ1.3mm dust emission shows that virial masses are on average by a factor of 20...30 larger. This can be explained by line opacity and by the larger beamwidths (1.8' vs. 23" and 12", respectively) of the CS survey.
Haslam G. T. C.
Kreysa Ernst
Launhardt Ralf
Lemke Roland
Mezger Peter G.
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