Spitzer and HHT observations of Bok globule B335: isolated star formation efficiency and cloud structure
We present infrared and millimeter observations of Barnard 335, the prototypical isolated Bok globule with an embedded protostar. Using Spitzer data we measure the source luminosity accurately; we also constrain the density profile of the innermost globule material near the protostar using the observation of an 8.0 μm shadow. Heinrich Hertz Telescope (HHT) observations of ^12CO2-1 confirm the detection of a flattened molecular core with diameter ~10,000 AU and the same orientation as the circumstellar disk (~100 to 200 AU in diameter). This structure is probably the same as that generating the 8.0 mu m shadow and is expected from theoretical simulations of collapsing embedded protostars. We estimate the mass of the protostar to be only ~5% of the mass of the parent globule.
Additional Information© 2008 American Astronomical Society. Received 2008 June 4, accepted for publication 2008 July 12. We thank Kevin M. Flaherty, Fabian Heitsch, and Craig Kulesa for helpful comments. We thank Thomas Robitaille for his help with model fitting. The authors also thank the anonymous referee for helpful comments that improved the text. A. M. S. thanks the c2d team members for insightful comments. Portions of this work were carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This work was supported by contract 1255094 issued by Caltech/JPL to the University of Arizona. This work was supported in part by National Science Foundation grant AST-0708131 to the University of Arizona. M. K. was supported by the KRF-2007-612-C00050 grant.
Published - STUapj08.pdf