CO Study of the HII Region Sharpless 301

Details CO Study of the HII Region Sharpless 301 CO Study of the HII Region Sharpless 301

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jkas...34..157j&link_type=abstract

Journal of the Korean Astronomical Society, vol. 34, no. 3, pp. 157-166

Astronomy and Astrophysics

Astronomy

Hii Region, Ism: Individual (S301), Ism: Molecular Lines, Ism: Morphology

Scientific paper

The molecular cloud associated with the HII region S301 has been mapped in the J=1-0 transitions of 12CO and 13CO using the 13.7 m radio telescope of Taeduk Radio Astronomy Observatory. The cloud is elongated along the north-south direction with two strong emission components facing the HII region. Its total mass is 8.7E+3 Msun. We find a velocity gradient of the molecular gas near the interface with the optical HII region, which may be a signature of interaction between the molecular cloud and the HII region. Spectra of CO, CS, and HCO+ exhibit line splitting even in the densest part of the cloud and suggests the clumpy structure. The radio continuum maps show that the ionzed gas is distributed with some asymmetry and the eastern part of the HII region is obscured by the molecular cloud. We propose that the S301 HII region is at the late stage of the champagne phase, but the second generation of stars has not yet been formed in the postshock layer.

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