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2013ApJ...767...58Z
A Massive Protostar Forming by Ordered Collapse of a Dense, Massive Core
Zhang, Yichen ( Department of Astronomy, University of Florida, Gainesville, FL 32611, USA ); Tan, Jonathan C. ( Department of Astronomy, University of Florida, Gainesville, FL 32611, USA; Department of Physics, University of Florida, Gainesville, FL 32611, USA ); De Buizer, James M. ( SOFIA-USRA, NASA Ames Research Center, MS 232-12, Building N232, P.O. Box 1, Moffett Field, CA 94035, USA ); Sandell, Göran ( SOFIA-USRA, NASA Ames Research Center, MS 232-12, Building N232, P.O. Box 1, Moffett Field, CA 94035, USA ); Beltran, Maria T. ( INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, Firenze I-50125, Italy ); Churchwell, Ed ( Department of Astronomy, University of Wisconsin, Madison, WI 53706, USA ); McKee, Christopher F. ( Department of Astronomy and Astrophysics, University of California, Berkeley, CA 94720, USA ; Department of Physics, University of California, Berkeley, CA 94720, USA ); Shuping, Ralph ( SOFIA-USRA, NASA Ames Research Center, MS 232-12, Building N232, P.O. Box 1, Moffett Field, CA 94035, USA ); Staff, Jan E. ( Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA ); Telesco, Charles ( Department of Astronomy, University of Florida, Gainesville, FL 32611, USA ); Whitney, Barbara ( Department of Astronomy, University of Wisconsin, Madison, WI 53706, USA ) and 1 coauthors show affiliations
The Astrophysical Journal, Volume 767, Issue 1, article id. 58, 6 pp. (2013).
Published in Apr 2013
We present 30 and 40 μm imaging of the massive protostar G35.20-0.74 with SOFIA-FORCAST. The high surface density of the natal core around the protostar leads to high extinction, even at these relatively long wavelengths, causing the observed flux to be dominated by that emerging from the near-facing outflow cavity. However, emission from the far-facing cavity is still clearly detected. We combine these results with fluxes from the near-infrared to mm to construct a spectral energy distribution (SED). For isotropic emission the bolometric luminosity would be 3.3 × 104 L . We perform radiative transfer modeling of a protostar forming by ordered, symmetric collapse from a massive core bounded by a clump with high-mass surface density, Σcl. To fit the SED requires protostellar masses ~20-34 M depending on the outflow cavity opening angle (35°-50°), and Σcl ~ 0.4-1 g cm-2. After accounting for the foreground extinction and the flashlight effect, the true bolometric luminosity is ~(0.7-2.2) × 105 L . One of these models also has excellent agreement with the observed intensity profiles along the outflow axis at 10, 18, 31, and 37 μm. Overall our results support a model of massive star formation involving the relatively ordered, symmetric collapse of a massive, dense core and the launching bipolar outflows that clear low-density cavities. Thus a unified model may apply for the formation of both low- and high-mass stars.
Keywords:
Free Keywords: Astrophysics - Galaxy Astrophysics; Astrophysics - Solar and Stellar Astrophysics; stars: formation
Astronomy: stars: formation
arXiv: Astrophysics - Galaxy Astrophysics; Astrophysics - Solar and Stellar Astrophysics
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