Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460407s&link_type=abstract
American Astronomical Society, AAS Meeting #214, #604.07
Astronomy and Astrophysics
Astronomy
Scientific paper
We have numerically followed the internal dynamics of a collapsing Bonnor-Ebert(BE) sphere, and examined how the radial velocity profile changes as the collapse proceeds.
The observed column densities of starless cores are well fitted with the BE sphere having different normalized core radii, ξmax. Owing to this fact, people prefer the BE sphere as a simplified model for a starless core, and their dynamics are often discussed based on the stability of the BE sphere. The motivation of this study is to see whether or not the dynamical model of the BE sphere may explain the observed infall speeds of several starless cores which have strong infall signatures in molecular lines.
In this study, we present velocity profiles at a set of selected epochs, or of the dimensionless size parameters ξmax. The profiles turn out to maintain a V-shape in the in-falling region. The peak velocities remain to be subsonic, until ξmax reaches about 60. We will present the peak velocities as a function of ξmax. The peak velocities from the simulations are compared with the observationally probed peak velocities for a handful of dense cores. The observed peak velocities are shown significantly faster than that of the collapsing BE sphere, and we will discuss implications of this result.
Hong Seung Sae
Kim Jongsoo
Seo Youngmin
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