First science results from SOFIA/forcast: Super-resolution imaging of the S140 cluster at 37 μm

Paul M. Harvey, The University of Texas at Austin
Joseph D. Adams, Cornell Center for Astrophysics and Planetary Science
Terry L. Herter, Cornell Center for Astrophysics and Planetary Science
George Gull, Cornell Center for Astrophysics and Planetary Science
Justin Schoenwald, Cornell Center for Astrophysics and Planetary Science
Luke D. Keller, Ithaca College
James M. De Buizer, NASA Ames Research Center
William Vacca, NASA Ames Research Center
William Reach, NASA Ames Research Center
E. E. Becklin, NASA Ames Research Center

Abstract

We present 37 μm imaging of the S140 complex of infrared sources centered on IRS1 made with the FORCAST camera on SOFIA. These observations are the longest wavelength imaging to resolve clearly the three main sources seen at shorter wavelengths, IRS 1, 2, and 3, and are nearly at the diffraction limit of the 2.5 m telescope. We also obtained a small number of images at 11 and 31 μm that are useful for flux measurement. Our images cover the area of several strong submillimeter sources seen in the area - SMM 1, 2, and 3 - that are not coincident with any mid-infrared sources and are not visible in our longer wavelength imaging either. Our new observations confirm previous estimates of the relative dust optical depth and source luminosity for the components in this likely cluster of early B stars. We also investigate the use of super-resolution to go beyond the basic diffraction limit in imaging on SOFIA and find that the van Cittert algorithm, together with the "multi- resolution" technique, provides excellent results. © © 2012. The American Astronomical Society. All rights reserved..