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Date and Time of the Query: 2019-08-21 T11:24:41 PDT
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For refcode 1992AJ....103.1484B:
Retrieve 28 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1992AJ....103.1484B SURFACE PHOTOMETRY OF DISK GALAXIES AT 60 AND 100 MICRONS: RADIAL GRADIENTS IN DUST TEMPERATURE IN OPTICALLY THIN DISKS GREGORY D. BOTHUN Department of Physics, University of Oregon, Eugene Oregon 97403 C. ROGERS Dominion Radio Astrophysical Observatory, P.O. Box 248, Penticton, British Columbia V2A 6K3, Canada Received 5 August 1991; revised 31 January 1992 ABSTRACT Surface, aperture, and grid photometry are performed at 60 and 100 microns for a sample of 28 nearby, large angular size galaxies. The spatial resolution of the data is 05-2.0 kpc, which allows for a coarse investigation of predicted radial gradients in physical dust temperature. We derive a model which predicts a drop of 3 K for every optical scale length, and this model agrees well with the data. In addition, for a subsample of 16 galaxies we directly compare the radial profile at 60 microns with that in the B or I band. Our model predicts that optically thick disks should have scale lengths a factor of 2 smaller at 60 microns compared to B. In the optically thin case, the scale lengths are about equal except for the effect of the gradient in dust temperature. Virtually all of the data support the prediction of the optically thin case. Finally, 10 galaxies in the sample have sufficient angular sizes to allow for a coarse 2D spatial mapping of the 60/100 micron flux ratio. These maps clearly reveal that, when present, small amounts of hot dust dominate the emission at 60 microns and effectively mask the existence of a much larger amount of cold dust.
Retrieve 28 NED objects in this reference.
Please click here for ADS abstract

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