An increase in the X-ray absorption of NGC 4151

Details An increase in the X-ray absorption of NGC 4151 An increase in the X-ray absorption of NGC 4151

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181p..43b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 43P-46P.

Astronomy and Astrophysics

Astronomy

47

Electromagnetic Absorption, Galactic Radiation, Seyfert Galaxies, X Ray Astronomy, Absorption Spectra, Ariel 5 Satellite, Galactic Nuclei, Gas Density, Iron

Scientific paper

The Ariel V Experiment C has been used to observe NGC 4151 in 1976 December. A hydrogen column density of 1.8 times 10 to the 23rd atom/sq cm was measured, four times larger than that reported by Ives, Sanford, and Penston (1976). This column density change is sufficient to explain the previously reported variability in the 2-10 keV energy range and indicates that the X-ray emission originates in the central area of the nucleus. An iron absorption edge is seen and an iron abundance relative to other heavy elements of 2.1 + or - 1.4 times the solar value is measured.

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