Adams, Joseph D. and Herter, Terry L. and Osorio, Mayra and Macias, Enrique and Megeath, S. Thomas and Fischer, William J. and Ali, Babar and Calvet, Nuria and D'Alessio, Paola and De Buizer, James M. and Gull, George E. and Henderson, Charles P. and Keller, Luke D. and Morris, Mark R. and Remming, Ian S. and Schoenwald, Justin and Shuping, Ralph Y. and Stacey, Gordon and Stanke, Thomas and Stutz, Amelia and Vacca, William (2012) First Science Observations with SOFIA/FORCAST: Properties of Intermediate-luminosity Protostars and Circumstellar Disks in OMC-2. Astrophysical Journal Letters, 749 (2). Art. No. L24. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20120507-110857657
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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^(–4) M_☉ yr^(–1).
|Additional Information:||© 2012 American Astronomical Society. Received 2012 January 6; accepted 2012 January 31; published 2012 March 29. We thank R. Grashius, S. Adams, H. Jakob, A. Reinacher, and U. Lampeter for their SOFIA telescope engineering and operations support. We also thank the SOFIA flight crews and mission operations team (A. Meyer, N. McKown, C. Kaminski) for their SOFIA flight planning and flight support. This work is based on observations made with the NASA/DLR Stratospheric Observatory for Infrared Astronomy (SOFIA). SOFIA science mission operations are conducted jointly by the Universities Space Research Association (USRA), Inc., under NASA contract NAS2-97001, and the Deutsches SOFIA Institut (DSI) under DLR contract 50 OK 0901. Financial support for FORCAST was provided to Cornell University by NASA through award 8500-98-014 issued by USRA. M.O. acknowledges support from MICINN (Spain) grants AYA2008-06189-C03 and AYA2011-30228-C03-01 (co-funded with FEDER funds). This work is based on observations made with the Spitzer Space Telescope, which is operated by JPL/Caltech under NASA contract 1407. Facilities: Spitzer, SOFIA, Herschel, APEX|
|Subject Keywords:||circumstellar matter; infrared: stars; protoplanetary disks; radiative transfer; stars: formation|
|Official Citation:||First Science Observations with SOFIA/FORCAST: Properties of Intermediate-luminosity Protostars and Circumstellar Disks in OMC-2 Joseph D. Adams et al. 2012 ApJ 749 L24|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||07 May 2012 18:42|
|Last Modified:||26 Dec 2012 15:09|
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