First science observations with SOFIA/FORCAST: Properties of intermediate-luminosity protostars and circumstellar disks in OMC-2

Joseph D. Adams, Cornell University
Terry L. Herter, Cornell University
Mayra Osorio, Instituto de Astrofísica de Andalucía - CSIC
Enrique MacIas, Instituto de Astrofísica de Andalucía - CSIC
S. Thomas Megeath, The University of Toledo
William J. Fischer, The University of Toledo
Babar Ali, Infrared Processing & Analysis Center
Nuria Calvet, University of Michigan, Ann Arbor
Paola D'Alessio, Instituto de Radioastronomía y Astrofísica
James M. De Buizer, NASA Ames Research Center
George E. Gull, Cornell University
Charles P. Henderson, Cornell University
Luke D. Keller, Ithaca College
Mark R. Morris, University of California, Los Angeles
Ian S. Remming, University of Rochester
Justin Schoenwald, Cornell University
Ralph Y. Shuping, NASA Ames Research Center
Gordon Stacey, Cornell University
Thomas Stanke, European Southern Observatory
Amelia Stutz, Max Planck Institute for Astronomy
William Vacca, NASA Ames Research Center

Abstract

We examine eight young stellar objects in the OMC-2 star-forming region based on observations from the SOFIA/FORCAST early science phase, the Spitzer Space Telescope, the Herschel Space Observatory, Two Micron All Sky Survey, Atacama Pathfinder Experiment, and other results in the literature. We show the spectral energy distributions (SED) of these objects from near-infrared to millimeter wavelengths, and compare the SEDs with those of sheet collapse models of protostars and circumstellar disks. Four of the objects can be modeled as protostars with infalling envelopes, two as young stars surrounded by disks, and the remaining two objects have double-peaked SEDs. We model the double-peaked sources as binaries containing a young star with a disk and a protostar. The six most luminous sources are found in a dense group within a 0.15 × 0.25 pc region; these sources have luminosities ranging from 300 L to 20 L . The most embedded source (OMC-2 FIR 4) can be fit by a class 0 protostar model having a luminosity of 50 L and mass infall rate of 10 M yr . © 2012 The American Astronomical Society. All rights reserved. ⊙ ⊙ ⊙ ⊙ -4 -1