The spatial distribution and spectral evolution of IRAS point sources around dense molecular clouds

Details The spatial distribution and spectral evolution of IRAS point sources around dense molecular clouds The spatial distribution and spectral evolution of IRAS point sources around dense molecular clouds

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180l...1c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. L1-L4.

Astronomy and Astrophysics

Astronomy

18

Infrared Astronomy Satellite, Infrared Sources (Astronomy), Molecular Clouds, Protostars, Spatial Distribution, Ammonia, Infrared Stars, Interstellar Gas, Star Formation, Surface Properties, Thermal Emission

Scientific paper

The spatial distribution of 396 IRAS infrared point sources located up to 2 parsecs from 60 dense molecular cloud cores is examined. The surface density of these sources strongly peaks near the dense molecular cores, extending out to 1 parsec. Sources are typically not located precisely at the center of a core. Two populations differing in infrared-emitting mass by three orders of magnitude are revealed. The lower emitting mass sources exhibit systematic changes over a 1 parsec range from the cores, such that the 12/25 μm color temperature gets warmer with increasing distance from the cores, ≡160K to ≡270K, while the mass of emitting dust falls nearly an order of magnitude. Over the same interval the 60/100 μm color temperature becomes cooler, ≡49K to ≡24K. These changes are interpreted in terms of published models as due to accretion of the envelope, suggest an observational age sequence in the IRAS colors, and offer a means of selecting potentially youthful objects.

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