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Ultraviolet Imaging Telescope ultraviolet images - Large-scale structure, H II regions, and extinction in M81The study employs UV images of M81 obtained by the Ultraviolet Imaging Telescope (UIT) during the December 1990 Astro-1 spacelab mission to determine 2490- and 1520-A fluxes from 46 H II regions and global surface brightness profiles. Comparison photometry in the V band is obtained from a ground-based CCD image. UV radial profiles show bulge and exponential disk components, with a local decrease in disk surface brightness inside the inner Lindblad Resonance about 4 arcmin from the nucleus. The V profile shows typical bulge plus exponential disk structure, with no local maximum in the disk. There is little change of UV color across the disk, although there is a strong gradient in the bulge. Observed m152-V colors of the H II regions are consistent with model spectra for young clusters, after dereddening using Av determined from m249-V and the Galactic extinction curve. The value of Av, so determined, is 0.4 mag greater on the average than Av derived from radio continuum and H-alpha fluxes.
Document ID
19930028541
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hill, Jesse K.
(Hughes STX Corp. Lanham, MD, United States)
Bohlin, Ralph C.
(Space Telescope Science Inst. Baltimore, MD, United States)
Cheng, Kwang-Ping
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hintzen, Paul M. N.
(NASA Goddard Space Flight Center Greenbelt, MD; Nevada Univ., Las Vegas, United States)
Landsman, Wayne B.
(Hughes STX Corp. Lanham, MD, United States)
Neff, Susan G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
O'Connell, Robert W.
(Virginia Univ. Charlottesville, United States)
Roberts, Morton S.
(National Radio Astronomy Observatory Charlottesville, VA, United States)
Smith, Andrew M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, Eric P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
August 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 395
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A12538
Funding Number(s)
CONTRACT_GRANT: NAGW-2596
CONTRACT_GRANT: NAG5-700
Distribution Limits
Public
Copyright
Other

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