Other
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jkas...27...31m&link_type=abstract
Journal of the Korean Astronomical Society, vol. 27, no. 1, p. 31-44
Other
1
Interstellar Medium, Molecules(H2Co), Molecular Clouds(M17, Ngc 2024)
Scientific paper
The 4.8Ghz formaldehyde absorption line in the dark clouds in M17 and NGC 2024 regions has been mapped. In both nebulae, we detected two H2CO line components. In M17, the 24 km/s cloud could be closely associated with the HII region located in front of the radio continuum source, and the 19km/s cloud is associated with the visual dark clouds with a larger extent which are closer to us. The 19km/s cloud has a mass motion approaching to the HII region. In both clouds, a velocity gradient from the north-east to south-west directions is observed. The line width has no variation indicating no collapsing motion. In NGC 2024, the 9km/s feature is extended along the dark bar in front of the bright nebula and a weak second parameter at 13km/s is confined to the immediate vicinity of the radio source. Indications are that the 9km/s cloud is physically associated with the dark bar and the 13km/s cloud is located behind the radio source. The angular extent, the column density, and the total mass of the clouds are derived. The radial velocities of other molecular lines observed in these clouds are compared. and a weak second component at of the bright nebula and a weak second component at could be associated with the HI cloud has a mass motion approaching
Lee Yong Bok
Minn Young Key
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