Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542909c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #429.09; Bulletin of the American Astronomical Society, Vol. 42, p.351
Mathematics
Logic
Scientific paper
We present observations of the Class 0 young stellar object L1157-mm using the Combined Array for Research in Millimeter-wave Astronomy (CARMA) in the 3 mm dust continuum and N2H+ line emission. For the first time, we detect a large-scale N2H+ flattened envelope that is extended with a linear size of 20,000AU perpendicular to the outflow direction. This N2H+ feature coincides with the 8 μm extinction feature, showing the outer envelope that is too dim to be detected in dust continuum. This highly flattened envelope also shows dynamical signatures consistent with a slow, solid-body rotation at large scales and gravitational infall in the inner region. The rotating flattened structure is not a rotation-supported circumstellar disk; instead, it resembles a prestellar core both morphologically and kinematically, suggesting that it can be the remnant from the dynamical processes of early core formation. In this study, we construct a simple model to interpret both the dust continuum and the N2H+ emission, and suggest a possible dynamical scenario for the overall properties of the envelope.
Chiang Hsin-Fang
Hartmann Lee
Looney Leslie
Tobin John J.
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