Nagayoshi Ohashi et al 1999 ApJ 518 L41 doi:10.1086/312067
Nagayoshi Ohashi1, Siow Wang Lee1, David J. Wilner2 and Masahiko Hayashi3
Show affiliationsWe have carried out observations of the starless core L1544 in the CCS (JN = 32-21) line at 9 mm wavelength using the Berkeley-Illinois-Maryland Association array. The maps show an elongated condensation, 0.15×0.045 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-1, in the outermost envelope, at radius 15,000 AU.
ISM: individual (L1544); ISM: kinematics and dynamics; stars: formation
Issue 1 (1999 June 10)
Received 1999 March 16, accepted for publication 1999 April 12
Published 1999 April 23
Nagayoshi Ohashi et al 1999 ApJ 518 L41
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