Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433l..49k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 433, no. 1, p. L49-L52
Astronomy and Astrophysics
Astronomy
8
Ammonia, Cyanoacetylene, Gas Density, Interstellar Gas, Line Spectra, Molecular Clouds, Molecular Spectra, Radio Spectra, Abundance, Astronomical Spectroscopy, Globules, Radio Astronomy, Radio Telescopes
Scientific paper
This study demonstrates crucial differences between quiescent Bok globules and dark cloud cores. Seventeen small, quiescent Bok globules were probed for the molecular lines of NH3 (J, K = 1, 1) and HC3N (J = 4-3) using the Haystack telescope. The spectra have 3 sigma integrated line intensity upper limits generally less than 0.1 K km/s. The upper limits are less than about 10% of the brightness of TMC-2 in the NH3 (1, 1) line and less than about 30% of the brightness of TMC-2 in the HC3N (4-3) line. Both lower chemical abundances of NH3 and lack of sufficiently dense gas columns through these globules are responsible for the absence of detectable lines. A simple statistical equilibrium analysis suggests that these globules have mean volume densities and NH3 abundance factors of 4-5 lower than seen in dark cloud cores. Our upper limits do not require lower than normal HC3N abundances.
Clemens Dan P.
Kane Brian D.
Myers Philip C.
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