The UV continuum spectrum of M81

Details The UV continuum spectrum of M81 The UV continuum spectrum of M81

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..495b&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 495-503.

Astronomy and Astrophysics

Astronomy

20

Continuous Spectra, Galactic Nuclei, Seyfert Galaxies, Ultraviolet Spectra, Horizontal Branch Stars, Iue, Star Distribution, Stellar Mass, Ultraviolet Astronomy

Scientific paper

From IUE data the absolute continuum spectrum for the nucleus of M81 in the 1200-3200 A range is presented. The spectrum can be fitted by an old stellar population with a small contribution from horizontal-branch stars. It is found that the number of stars with m less than 0.3 solar mass is negligible. An upper limit for the nonthermal contribution to the UV spectrum is obtained, which together with the radio and X-ray fluxes yields a power law spectrum with alpha(ux) ranging from 0.7 to 1.3. The power-law radiation field produces from 5 percent to 50 percent of the photons needed to maintain the nuclear regions of M81 ionized.

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