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Published January 20, 2007 | Published
Journal Article Open

The Spitzer c2d Survey of Nearby Dense Cores. IV. Revealing the Embedded Cluster in B59


Infrared images of the dark cloud core B59 were obtained with the Spitzer Space Telescope as part of the "Cores to Disks" Legacy Science project. Photometry from 3.6-70 μm indicates at least 20 candidate low-mass young stars near the core, more than doubling the previously known population. Out of this group, 13 are located within ~0.1 pc in projection of the molecular gas peak, where a new embedded source is detected. Spectral energy distributions span the range from small excesses above photospheric levels to rising in the mid-infrared. One other embedded object, probably associated with the millimeter source B59-MMS1, with a bolometric luminosity L_(bol) ~ 2 L_⊙, has extended structure at 3.6 and 4.5 μm, possibly tracing the edges of an outflow cavity. The measured extinction through the central part of the core is A_V ≳ 45 mag. The B59 core is producing young stars with a high efficiency.

Additional Information

© 2007 The American Astronomical Society. Received 2006 June 13; accepted 2006 October 9. We thank M. Lombardi (ESO) for assistance, C. DeVries (CSU Stanislaus) for making molecular line data available prior to publication, and R. Gutermuth (CfA) for display scripts. We thank the referee whose comments improved the paper. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Support for this work, part of the Spitzer Space Telescope Legacy Science Program, was provided by NASA through contract numbers 1224608, 1230779, and 1230780 issued by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Astrochemistry in Leiden is supported by a NWO Spinoza grant and a NOVA grant. C.W.L. acknowledges support from KOSEFF grant R01-2003-000-10513-0. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center /California Institute of Technology, funded by NASA and NSF. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.

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