Further investigations of the CO emission from the North America dust cloud and L1630

Details Further investigations of the CO emission from the North America dust cloud and L1630 Further investigations of the CO emission from the North America dust cloud and L1630

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..673m&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 1, p. 673-677, 679 (8 ff.).

Astronomy and Astrophysics

Astrophysics

25

Carbon Monoxide, Cosmic Dust, Interstellar Matter, Molecular Spectra, Nebulae, Emission Spectra, Interstellar Magnetic Fields, Stellar Spectra, Turbulent Flow

Scientific paper

This paper reports further observations of the J = 1-0 rotational lines of (C-12)(O-16) and (C-13)(O-16) in two dust clouds, the North America Nebula dust cloud and L1630. The observations have higher velocity resolution (0.25 km/s) than had been available previously. A search was conducted for bright CO emission from the directions of individual H-alpha-emission stars in L1630 and the North America cloud, but the CO emission at these places is not enhanced above that of the surrounding material. It is concluded that these stars are too cool to heat the gas appreciably. The possibility is discussed that magnetic fields in dust clouds prevent rapid dissipation of turbulent motions in these clouds. The shapes of the CO profiles observed near NGC 2023 show that the gas motions there are turbulent, rather than systematic radial motions of the gas. From the observations of the North America Nebula dust cloud, it is shown that not more than about 10 per cent of the carbon present in the gas is in the form of CO.

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