Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429..726h&link_type=abstract
The Astrophysical Journal, vol. 429, no. 2, pt. 1, p. 726-735
Astronomy and Astrophysics
Astrophysics
4
Astronomical Models, Cosmic Dust, Heat Sources, Infrared Imagery, Interstellar Extinction, Mapping, Orion Nebula, Spectral Resolution, Stellar Temperature, Arrays, Bolometers, Calibrating, Infrared Telescopes, Observatories, Spatial Resolution, Spectrometers
Scientific paper
We have imaged the central square arcminute of the Ney-Allen nebula in Orion at 12 wavelengths from 8 to 25 micrometer about 5 sec spatial resolution. The familiar 10 micrometer emission peak near theta1 Ori D becomes more diffuse towards longer wavelengths, and a second peak appears about 20 sec to its west at wavelengths longer than 20 micrometer. The nebula's spectrum over the region mapped is well fitted by a simple two-component dust model based on the Draine & Lee astronomical silicate function. The temperature of the first dust component averages 300 K, while that of the second component is about 110 K. The cool component appears to correspond to dust in the back wall of the H II region lister which is primarily heated by direct radiation from theta1 Ori C. A combination of direct and Ly alpha heating is required to explain the high temperature of the warm component.
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