Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174p..35s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 174, Feb. 1976, p. 35P-39P.
Astronomy and Astrophysics
Astronomy
15
Energy Spectra, Galactic Radiation, Spaceborne Astronomy, X Ray Spectra, Absorption Spectra, Abundance, Active Galaxies, Ariel Satellites, Iron, Line Spectra, Photon Density, Power Spectra, Radiant Flux Density, Satellite Observation, Spectrum Analysis, X Ray Astronomy
Scientific paper
Observations of the active galaxy NGC 5128 (Centaurus A) have been made by the satellite Ariel V for a two-day period in 1975 January, and by the satellite Copernicus for one day in 1975 July. The observations from Ariel V permit an accurate description of the X-ray spectrum to be made over the band 1.3-28.7 keV. The best-fit spectrum is a power law with photon index of -1.79 + or - 0.02 for a line-of-sight hydrogen column density of 1.35 + or - 0.02 times 10 to the 23rd atom per sq cm. The absence of an iron absorption feature in the spectrum allows us to set an upper limit of twice the normal cosmic value to the abundance of iron. The flux detected in January was higher than had been previously observed, but by July this flux level had fallen by 40 per cent.
Culhane Leonard J.
Davison J. N. P.
Stark J. P.
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