A new look at the dark cloud L1251: Sensitive observations of the molecular emission

Details A new look at the dark cloud L1251: Sensitive observations of the molecular emission A new look at the dark cloud L1251: Sensitive observations of the molecular emission

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...435..279s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 435, no. 1, p. 279-289

Astronomy and Astrophysics

Astronomy

50

Emission Spectra, Gas Dynamics, Infrared Astronomy, Interstellar Gas, Molecular Clouds, Molecular Spectra, Radio Astronomy, Star Formation, Astronomical Maps, Astronomical Spectroscopy, H Alpha Line, Kinematics, Molecular Gases, Molecular Spectroscopy, Radio Telescopes, Spectroscopic Telescopes

Scientific paper

High-sensitivity observations in the (12)CO, (13)CO, C(18)O, H(13)CO(+), and SiO line have been made of the dark cloud L1251 in Cepheus. The (13)CO gas shows a cometary distribution with a U-shaped dense 'head' having a highly ordered velocity gradient in the direction parallel to the minor axis of the cloud. Five C(18)O cores characterized by a mass of approx. 50 Solar mass and a mean density of approximately 3 x 103 cc are embedded in the (13)CO cloud. Three of them have associated far-infrared sources, suggesting that stars have recently formed there. High angular resolution (12)CO observations have revealed a well-collimated compact outflow confined in the most massive, densest C(18)O core. Its driving source is embedded in a small H(13)CO(+) core with a mass of approximately 1-3 Solar mass. A possibility is suggested that the U shape of the cloud and its well-defined velocity gradient may have resulted from some dynamical interaction with the ambient matter.

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