Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...508..780n&link_type=abstract
The Astrophysical Journal, Volume 508, Issue 2, pp. 780-790.
Astronomy and Astrophysics
Astronomy
8
Line: Formation, Radiative Transfer, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We report new radiative transfer calculations of submillimeter and millimeter molecular line emission from fully three-dimensional models of protostars. The radiative transfer calculations are performed using the parameterized, semianalytic, rotating collapse solutions of Terebey, Shu, & Cassen. These results are compared with the class of ``self-consistent,'' nonspherical, hydrodynamic, rotating collapse solutions (Boss; Walker, Narayanan, & Boss). We explore the sensitivity of the ``blue-bulge'' infall signature to rotational rate, infall time, sound speed, and abundance gradients in the molecular tracer of choice. At high angular resolutions, models with moderate to high rotational rates exhibit the ``polar blue bulge''-a centroid velocity signature of underlying Keplerian rotation in an embedded cloud core. Submillimeter transitions of HCO^+ and CS are found to be better than millimeter transitions in detecting infall, especially at early collapse times.
Narayanan Gopal
Walker Christopher K.
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