On the nature of the molecular cores in high-latitude cirrus clouds. I - A survey of H2CO (2 centimeter), C3H2, and HC3N

Details On the nature of the molecular cores in high-latitude cirrus clouds. I - A survey of H2CO (2 centimeter), C3H2, and HC3N On the nature of the molecular cores in high-latitude cirrus clouds. I - A survey of H2CO (2 centimeter), C3H2, and HC3N

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..292t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 292-305.

Astronomy and Astrophysics

Astronomy

48

Cyanoacetylene, Formaldehyde, Infrared Cirrus (Astronomy), Interstellar Matter, Molecular Clouds, Abundance, Cyclic Hydrocarbons, Gravitational Effects, Infrared Astronomy Satellite, Interstellar Chemistry, Star Formation

Scientific paper

The 2-cm H2CO emission has been detected in 12 of the 28 core regions surveyed in 15 different high-latitude cirrus complexes, together with the C3H2 line in 16 of the cores and, possibly, the HC3N line in two of the cores. The fractional abundances of H2CO, C3H2, and HC3N, are noted to be at least an order of magnitude lower than those of Galactic plane dark clouds; the derived extinctions are higher than previous high resolution estimates, suggesting that external UV fields play only a minor role in either the chemistry or the grain heating. A low metallicity for the cirrus cores is suggested as the basis for the observed low fractional abundances.

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