A Large-Scale 13CO Mapping of the W 49 A Molecular Cloud Complex

Details A Large-Scale 13CO Mapping of the W 49 A Molecular Cloud Complex A Large-Scale 13CO Mapping of the W 49 A Molecular Cloud Complex

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61...39m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.1, pp.39--49

Astronomy and Astrophysics

Astronomy

1

Ism: Clouds, Ism: Hii Regions, Ism: Individual (W 49 A), Ism: Kinematics And Dynamics, Stars: Formation

Scientific paper

We present 13CO (J = 1-0) and C18O (J = 1-0) maps of the W 49 A molecular cloud complex observed at a resolution of 17'' (HPBW). Fourteen features (MHH-1 to MHH-14) were identified in the 13CO velocity channel maps, most of them distributed within an area of 6' (20pc) in diameter with their total mass amounting to 1.7 × 106Modot. The features have a three-dimensional velocity dispersion of 8km s-1, which leads to a mean free time per feature of 106yr. This suggests that they are interacting one another in a region of ˜20pc in diameter. The feature MHH-1, which corresponds to W 49 N, is unique in that it exhibits a large velocity width (15km s-1 FWHM) and is compact in size (2.3pc × 3.0pc FWHM), while containing a large mass of 2.4 × 105Modot. This indicates that the free-fall time of MHH-1 is on the order of 105yr, an order of magnitude smaller than that of the entire complex. It has turned out that MHH-1 has a smaller spatial width at VLSR ≲ 8km s-1 than at ≳8km s-1. This result, together with the line-profile characteristics of various optically thin lines, suggests that at least two massive clouds with different radial velocities exist toward MHH-1. The massive compact feature may have been produced by the interaction of the two different velocity clouds.

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