The Evolution of Density Structure of Starless and Protostellar Cores

Details The Evolution of Density Structure of Starless and Protostellar Cores The Evolution of Density Structure of Starless and Protostellar Cores

2009-12-23

arxiv.org/abs/0912.4738v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

19 pages, 3 figures, accepted for publication in the Astrophysical Journal

Scientific paper

We present a near-infrared extinction study of nine dense cores at evolutionary stages between starless to Class I. Our results show that the density structure of all but one observed cores can be modeled with a single power law rho \propto r^p between ~ 0.2R-R of the cores. The starless cores in our sample show two different types of density structures, one follows p ~ -1.0 and the other follows p ~ -2.5, while the protostellar cores all have p ~ -2.5. The similarity between the prestellar cores with p ~ -2.5 and protostellar cores implies that those prestellar cores could be evolving towards the protostellar stage. The slope of p ~ -2.5 is steeper than that of an singular isothermal sphere, which may be interpreted with the evolutionary model of cores with finite mass.

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