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Title:
Spatially extended 10 micron emission from the infrared reflection nebula GSS30
Authors:
Castelaz, M. W.; Gehrz, R. D.; Grasdalen, G. L.; Hackwell, J. A.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA), AB(Wyoming, University, Laramie), AC(Wyoming, University, Laramie), AD(Wyoming, University, Laramie)
Publication:
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Oct. 1985, p. 924-929. NSF-supported research. (PASP Homepage)
Publication Date:
10/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INFRARED PHOTOMETRY, INFRARED RADIATION, REFLECTION NEBULAE, ASTRONOMICAL MAPS, BRIGHTNESS DISTRIBUTION, MAGNITUDE
DOI:
10.1086/131645
Bibliographic Code:
1985PASP...97..924C

Abstract

A surface brightness map and point-wise photometry at 10 μm of the infrared reflection nebula GSS30 were made with the Wyoming 2.3 m telescope. Extended emission is detected as far as 10 arc seconds north of the illuminating star, IRS 1. The photometry shows that the nebular surface brightness is a factor of three more than that expected from thermal emission from dust grains. If the 10 μm flux is due to scattering, then grains with a radius of 1.6 μm are required. Alternatively, the 10 μm flux is consistent with the flux expected from the unidentified IR emission features at 7.7, 8.6, and 11.3 μm.

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