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A Survey of Near Infrared Emission in Visual Reflection Nebulae
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ApJ Supplement, in press
A Survey of Near Infrared Emission in Visual Reflection Nebulae
K. Sellgren1,2
Department of Astronomy, Ohio State University, 174 West 18th Av., Columbus, OH
43210 USA
e-mail: sellgren@payne.mps.ohio-state.edu
M. W. Werner1
M/S 169-327, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
91109
e-mail: mww@ipac.caltech.edu
L. J. Allamandola1
M/S 245-6, NASA Ames Research Center, Moffett Field, CA 94035
1Visiting astronomer at the Infrared Telescope Facility, operated by the University of
Hawaii under contract with the National Aeronautics and Space Administration.
2Alfred P. Sloan Foundation Research Fellow
– 2 –
Abstract
We present a survey for extended 2.2 μm emission in 20 new visual reflection nebulae,
illuminated by stars with temperatures of 3,600 — 33,000 K. We detect extended 2.2 μm
emission in 13 new nebulae, illuminated by stars with temperatures of 6,800 – 33,000 K. For
most of these 13 nebulae we have measured J ?K, H ?K, and K ?L′, as well as obtaining
surface brightness measurements at the wavelength of the 3.3 μm emission feature. All of
the reflection nebulae with extended near infrared emission in excess over scattered starlight
have very similar near infrared colors and show the 3.3 μm feature in emission with similar
feature-to-continuum ratios. The 3.3 μm feature-to-continuum ratio ranges from ～3 to ～9,
both within individual nebulae and from nebula to nebula, which suggests that the 3.3 μm
feature and its underlying continuum arise from different materials, or from different ranges
of sizes within a size distribution of particles. No dependence on the temperature of the
illuminating star is seen in the near infrared colors or 3.3 μm feature-to-continuum ratio,
over a factor of two in stellar temperature. This is similar to our previous IRAS results,
in which we found no dependence of the ratio of 12 μm to 100 μm surface brightn
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