CCS Imaging of the Starless Core L1544: An Envelope with Infall and Rotation

Details CCS Imaging of the Starless Core L1544: An Envelope with Infall and Rotation CCS Imaging of the Starless Core L1544: An Envelope with Infall and Rotation

1999-04-13

arxiv.org/abs/astro-ph/9904173v1

Astronomy and Astrophysics

Astrophysics

14 pages, 4 figures, AAS-LaTex v4.0, will be published in ApJL

Scientific paper

10.1086/312067

We have carried out observations of the starless core L1544 in the CCS (J_N=3_2-2_1) line at 9 millimeters wavelength using the BIMA array. The maps show an elongated condensation, 0.15 x 0.045 pc in size, with stronger emission at the edges. The appearance is consistent with a flattened, ringlike structure viewed at high inclination to the line of sight. The CCS molecule is likely heavily depleted in the inner part of the core. The position velocity diagram along the major axis shows a remarkable pattern, a "tilted ellipse", that can be reproduced by a simple model ring with motions of both infall and rotation. The models suggest comparable velocities for infall and rotation, ~0.1 km/s, in the outermost envelope, at radius 15000 AU.

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