Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...507l.171w&link_type=abstract
The Astrophysical Journal, Volume 507, Issue 2, pp. L171-L175.
Astronomy and Astrophysics
Astronomy
58
Ism: Dust, Extinction, Infrared: Ism: Continuum, Ism: Clouds, Ism: Individual: Alphanumeric: L1498
Scientific paper
We present 100 and 200 μm ISOPHOT observations of the dense core L1498. We have mapped the central core by using DeltaI_200=I_200-I_100/Theta, where DeltaI_200 is a measure of the emission from the cold dust and Theta=I_100/I_200 in the outer regions. The dust continuum emission provides information about the chemical depletion and the properties of cold cores where there is a lack of gas tracers. Previous observations of L1498 show that the emission from CS and CCS lies outside of the NH_3 core. The peak in DeltaI_200 lies close to the previously observed NH_3 peak. A comparison with high spatial resolution observations of C^18O emission shows that the DeltaI_200 maximum coincides with a dip in the C^18O emission at the core center. We estimate that the depletion factor for C^18O in this region is at least 8 and is likely to be much larger. Such high depletion has significant implications for studies of gas-grain chemistry and protostellar cores.
Langer William D.
Velusamy Thangasamy
Willacy Karen
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