Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..347m&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)347-(12)350
Astronomy and Astrophysics
Astronomy
16
Absorption Spectra, Active Galactic Nuclei, Computerized Simulation, Ionization, Iron, Oxygen, Quasars, Variations, X Ray Astronomy, X Ray Spectra, Density (Mass/Volume), Exosat Satellite, Ginga Satellite, Luminosity, Mass Distribution, Proportional Counters, X Ray Telescopes
Scientific paper
Ginga observations have suggested the presence of iron absorption edges at energies appropriate for highly ionized material in the X-ray spectra of a significant number of active galactic nuclei. Here, we present a detailed self-consistent analysis of a series of Ginga and EXOSAT observations of MR2251-178, the original prototype of this warm-absorber phenomenon. The observations do indeed support the presence of a substantial column density of highly ionized material. The ionization state of the material responds to changes in the luminosity of the ionizing continuum, with the ionization state of oxygen being particularly sensitive. Analsyis of this variability leads to constraints on the density and location of this material as well as its total amount.
Mineo Teresa
Stewart Gordon C.
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