Large-Scale Mapping Observations of the C I ^3P_1-^3P_0 Line toward Heiles Cloud 2 in the Taurus Dark Cloud

Details Large-Scale Mapping Observations of the C I ^3P_1-^3P_0 Line toward Heiles Cloud 2 in the Taurus Dark Cloud Large-Scale Mapping Observations of the C I ^3P_1-^3P_0 Line toward Heiles Cloud 2 in the Taurus Dark Cloud

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524l.129m&link_type=abstract

The Astrophysical Journal, Volume 524, Issue 2, pp. L129-L132.

Astronomy and Astrophysics

Astronomy

29

Ism: Atoms, Ism: Clouds, Ism: Evolution, Ism: Individual: Name: Heiles'S Cloud 2

Scientific paper

A distribution of the neutral carbon atom (C I) in Heiles cloud 2 (HCL2) has been investigated with the Mount Fuji submillimeter-wave telescope. A region of 1.2 deg^2 covering a whole region of HCL2 has been mapped with the ^3P_1-^3P_0 fine-structure line (492 GHz) of C I. The global extent of the C I emission is similar to that of ^13CO, extending from southeast to northwest. However, the C I intensity is found to be rather weak in dense cores traced by the J=1-0 line of C^18O. On the other hand, strong C I emission is observed in a south part of HCL2 in which the C^18O intensity is fairly weak. The C I/CO abundance ratio is greater than 0.8 for the C I peak, whereas it is 0.1 for the dense cores such as the cyanopolyyne peak. The C I-rich cloud found in the south part may be in the early evolutionary stage of dense core formation where C I has not yet been converted completely into CO. This result implies that formation of dense cores is taking place from north to south in HCL2.

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