Morphological Complexity of Protostellar Envelopes - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado

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Abstract: Extinction maps at 8 micron from the Spitzer Space Telescope show that manyClass 0 protostars exhibit complex, irregular, and on-axisymmetric structurewithin the densest regions of their dusty envelopes. Many of the systems havehighly irregular and on-axisymmetric morphologies on scales $\sim$1000 AU, witha quarter of the sample exhibiting filamentary or flattened dense structures.Complex envelope structure is observed in regions spatially distinct fromoutflow cavities, and the densest structures often show no systematic alignmentperpendicular to the cavities. We suggest that the observed envelope complexityis the result of collapse from protostellar cores with initiallynon-equilibrium structures. The striking non-axisymmetry in many envelopescould provide favorable conditions for the formation of binary systems. We thenshow that the kinematics around L1165 as probed with N2H+ are indicative ofasymmetric infall; the velocity gradient is not perpendicular to the outflow.

Autor: John J. Tobin, Lee Hartmann, Edwin Bergin, Leslie W. Looney, Hsin-Fang Chiang, Fabian Heitsch


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