The following document lists the file abstract/DCLEMENS_FDC_TEMP.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
Filamentary Dark Clouds (FDC), or globular filaments (GF), are
nearby (100 - 400pc distance) molecular clouds containing small numbers
of dense cloud cores connected by low density gas and dust. These
clouds look like strings (the low opacity material) with beads (the
dense cores) strung along their lengths, often in a periodic fashion.
These FDCs may represent swept-up material, created by blast waves
or strong stellar winds, or they may be a stable form of galactic
molecular clouds. They most likely represent a transient phase of the
molecular material, on its way from having resided in a larger cloud
complex to in the future becoming a collection of Bok globules, or
dispersing altogether. We seek to determine the physical nature of the
dust contained in the denser cores (beads) and filamentary material
(string) for a sample of FDCs. The physical parameters to be probed
under this program include the dust temperatures, dust densities, and
dust compositions.
IRAS was barely able to detect the cold dust in these clouds, and
generally only in its longest wavelength channel. However, the longer
wavelengths, sensitivity, and pointing capabilities of ISO make it the
only observatory capable of performing this investigation. We seek to
obtain two modest sized (9-10 arcmin) maps in each of five clouds (one
map toward a dense core region, one toward a filamentary region, for
each cloud) using the ISOPHOT C100 and C200 arrays and four filters.
These maps will be used to create dust temperature, density, and
composition maps, for comparison between the core and filament
regions, and to similar resolution maps of the molecular gas obtained
at mm wavelengths. These maps will be analyzed to examine the detailed
temperature structure within the cores in order to model their thermal
balance and to probe for variations in the interstellar radiation
field, the chief source of input energy for these cold clouds.