Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..869m&link_type=abstract
Astronomy and Astrophysics, v.299, p.869
Astronomy and Astrophysics
Astrophysics
22
Stars: Formation, Ism: Clouds, Dust, Hii Regions, Infrared: Ism: Continuum, Radio Continuum: Ism
Scientific paper
As part of an ongoing program "Dust emission from star forming regions" on the cloud core regions of a subset of 51 IR-strong (IRS) and 27 IR-quiet (IRQ) giant molecular clouds (GMCs) defined by CO have been selected for their associated CS and IRAS FIR emission. The dust emission from 13 IRS and 4 IRQ GMCs was mapped with the 15 m SEST telescope at λ1300μm. Two of the GMCs of each category were not detected. A total of 12 regions with dust emission were subsequently mapped with the IRAM 30m telescope at the same wavelength but with an angular resolution of ~12". Here we present results for six of the dust emission regions. They consist of compact cloud cores embedded in a more extended dust envelope with hydrogen column densities N_H_>10^23^/cm-2. The hydrogen mass associated with the dust emission from compact cores and extended envelopes accounts for only a few percent of the virial mass derived for the parental GMC. The mass associated with the compact cores on the average accounts for ~40% of the mass of cores and envelope. The physical parameters of the dust cores are derived and compared with those of W49A, W51A, Orion A and SgrB2 - GMCs well-known for their highly varying high-mass star formation activities per unit mass of molecular hydrogen. The cloud cores of our sample are found to span a similar range. The IR luminosities are estimated from the IRAS survey. The parental IRS GMCs have IR luminosity-to-mass ratios of ~3-4Lsun_/Msun_. IRQ GMCs have ratios of <~0.5Lsun_/Msun_.
Haslam G. T. C.
Kreysa Ernst
Lemke Roland
Mezger Peter G.
Mooney Thomas
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