Ultraviolet photometry from the Orbiting Astronomical Observatory. XL - The energy distributions of spiral and irregular galaxies

Details Ultraviolet photometry from the Orbiting Astronomical Observatory. XL - The energy distributions of spiral and irregular galaxies Ultraviolet photometry from the Orbiting Astronomical Observatory. XL - The energy distributions of spiral and irregular galaxies

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256....1c&link_type=abstract

Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 1-12. Natural Sciences and Engineering Research Council of Canada

Astronomy and Astrophysics

Astrophysics

77

Astronomical Photometry, Galactic Radiation, Galaxies, Oao, Energy Distribution, Galactic Evolution, Galactic Structure, Luminosity, Spiral Galaxies, Ultraviolet Photometry

Scientific paper

Measurements of the total light of 40 spiral and irregular galaxies are presented. The photometry covers the wavelength range 1550-4250 A and is calibrated on an absolute basis. On the average later-type galaxies are not only bluer at short wavelengths than ellipticals but significantly bluer than visual colors would imply. This reflects a recent history of more vigorous formation of massive stars. The shape of the upper part of the initial mass function apparently varies more among early-type galaxies, producing a wide scatter in their energy distributions. In at least some galaxies interstellar dust appears to have little influence upon the emerging radiation. The local volume luminosity spectrum due to galaxies turns up steeply at short wavelengths, and is shaped largely by contributions from late-type galaxies. The observed ultraviolet background cannot be produced by normal galaxies, although the large corrections implied by theoretical evolutionary models may account for the measurements.

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