The total luminosity of the Rho Ophiuchi molecular cloud is derived from IRAS
data and is found to match the luminosity of known embedded sources very closely.
High resolution 60 and 100 micron band IRAS images have been reduced to yield
equilibrium color temperature maps and 60 micron band dust optical depth maps
for the region. These data along with optically thin C18O column density data
are used to evaluate dust grain sizes and compositions via competing grain models.
Radiative modeling shows that a standard power law distribution of graphite and
silicate grains is responsible for IRAS 60 and 100 micron band emissions. These
grains are heated to about one tenth of the cloud's depth in the core region. Their
optical depths closely follow molecular column density structure, but these grains
are considerably colder than the molecular gas. We also find that a 10 nm minimum
particle radius cutoff is appropriate for the 60 and 100 micron band emissions while
very small grains or PAH molecules dominate the cloud's 12 and 25 micron band
emissions.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/623887 |
| Date | 10 1900 |
| Creators | Greene, T. P., Young, E. T. |
| Contributors | Univ Arizona, Steward Observ |
| Publisher | Steward Observatory, The University of Arizona (Tucson, Arizona) |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Article |
| Source | Steward Observatory Parker Library SO QB 4 .S752 ARCH |
| Rights | Copyright © All Rights Reserved. |
| Relation | Preprints of the Steward Observatory #833, http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1989ApJ...339..258G&db_key=AST&data_type=HTML&format=&high=3ed65e9cd008931 |
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