Optical Observations of High-Latitude Clouds. Adolf N. Witt University of Toledo. Collaborators: Steve Mandel, Hidden Valley Obs., Soquel, CA Thomas G. Dixon, Univ. of Hertfordshire, UK Paul H. Sell, Univ. of Toledo Karl D. Gordon, Univ. of Arizona Uma P. Vijh, STScI With support from:
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Adolf N. Witt
University of Toledo
Steve Mandel, Hidden Valley Obs., Soquel, CA
Thomas G. Dixon, Univ. of Hertfordshire, UK
Paul H. Sell, Univ. of Toledo
Karl D. Gordon, Univ. of Arizona
Uma P. Vijh, STScI
With support from:
NSF Galactic Astronomy Program
RC Optical Systems
Santa Barbara Instrument Group, Inc.
First optical studies of HLCs by Allan Sandage, 1976, AJ, 81, 954, with M81
“Re-discovery” of HLCs by IRAS, F. J. Low et al. 1984, ApJ, 278, L19
Led to new designation as “IR Cirrus”
Followed by detailed studies at mm-wavelengths (CO) by Magnani et al.
Remotely operated, self-guided small telescopes, equipped with CCD cameras.
Detection of diffuse, extended sources depends only on f-ratio, not aperture.
Location: New Mexico Skies Altitude ~7300 ft, near Cloudcroft, NM
Primary Goal: Determination of the optical SEDs of HLCs
Special BGRIHa filter set during Phase1 of our program
15-band BATC filter set during Phase 2 of our program. These filters allow the determination of a detailed cloud SED while avoiding the strongest emission features of the permanent airglow from the Earth atmosphere.
This is extended red emission ---->
ERE is relatively important, because dust scattering is not very efficient at
high galactic latitudes.
Linear structures ~ 500 AU wide
Linear structures again; nT ~ 106 K cm-3
We are collaborating with Steven Gibson on the analysis of our data.