Evidence for inward motion in a galactic cirrus core

Details Evidence for inward motion in a galactic cirrus core Evidence for inward motion in a galactic cirrus core

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...349l..53h&link_type=abstract

Astronomy and Astrophysics, v.349, p.L53-L56 (1999)

Astronomy and Astrophysics

Astrophysics

13

Stars: Formation, Ism: Kinematics And Dynamics, Ism: Individual Objects: Mcld 123.5+24.9, Ism: Molecules, Radio Lines: Ism

Scientific paper

Using the IRAM 30 m radiotelescope a dense core in MCLD 123.5+24.9 has been observed in the CS (J=2->1), (3->2) and (5->4) lines. In the lower two rotational lines the cloud extends over 0.03 pc x 0.15 pc at an adopted distance of 150 pc. The core harbours three dense condensations with full widths at half maximum between 4500 and 6100 AU. Based on C(18) O observations their masses are estimated to be between 0.06 and 0.12 M_{\odot}. The southernmost shows asymmetric self-absorbed CS (2->1) and (3->2) lines with the blue shifted part brighter than the red shifted; the velocity of the (5->4) transition is in between the blue and red shifted lines of the lower transitions. These features are well-tested diagnostics of inward motion in molecular clouds. An inward velocity of 4 to 10 m s(-1) is estimated from the CS lines.

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