Images in the rocket ultraviolet - Photometry of M101

Details Images in the rocket ultraviolet - Photometry of M101 Images in the rocket ultraviolet - Photometry of M101

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..542h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 542-549.

Astronomy and Astrophysics

Astronomy

25

Image Intensifiers, Rocket-Borne Instruments, Spiral Galaxies, Ultraviolet Astronomy, Ultraviolet Photometry, Astronomical Photography, Bandpass Filters, Hydrogen Clouds, Nebulae, Stellar Evolution

Scientific paper

Three ultraviolet images of the Sc I galaxy M101 (NGC 5457) were obtained by a rocket-borne telescope, using a microchannel plate image intensifier coupled to IIa-O film, giving an effective wavelength of 2250 Å, a bandpass of 970 Å, and about 10arcsec resolution over an 80arcmin field. Extreme Population I dominates in the UV in the form of OB/H II complexes. The 57 OB/H II sources measured here account for half the UV flux of the galaxy. Large-scale spiral structure was investigated using azimuthal and radial profiles. A comparison with optical results shows that the colors of the disk and spiral arm components do not vary significantly with radius, and that the arm-to-disk ratio is a factor ≡3 higher in the UV than in the visible.

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