A Survey for High-Latitude Molecular Clouds toward Infrared-Excess Clouds with NANTEN

Details A Survey for High-Latitude Molecular Clouds toward Infrared-Excess Clouds with NANTEN A Survey for High-Latitude Molecular Clouds toward Infrared-Excess Clouds with NANTEN

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1017o&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1017-1023

Astronomy and Astrophysics

Astronomy

9

Ism: Clouds, Ism: Dust, Extinction, Ism: Individual (High Latitude Clouds), Ism: Molecules

Scientific paper

A survey for high Galactic latitude molecular clouds was carried out toward the far-infrared-excess clouds of Reach et al. (1998, AAA 070.131.207) using the NANTEN telescope. All 68 infrared-excess clouds that are observable from NANTEN were mapped in the J = 1 -- 0 line of 12CO. CO emission was detected from 32 infrared excess clouds, corresponding to a CO detection rate of 47%. Most of these CO clouds were identified and mapped as high-latitude clouds for the first time. The CO detection rate for the cold (Tdust < 17 K) infrared excess clouds is 72%, which is more than a factor of two higher than that of warmer ones, 33%. This indicates that the cold clouds are well shielded from external UV radiation, resulting in a high CO abundance and a low temperature of the clouds. The infrared-excess clouds with no CO emission are most likely to be molecular hydrogen clouds because the temperature is similar to, or lower than, that of the surrounding HI gas. The molecular gas without CO emission seems to occupy more than 90% of the area of the infrared-excess clouds.

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