X-Ray Observations of the Warm Absorber in NGC 3783

Details X-Ray Observations of the Warm Absorber in NGC 3783 X-Ray Observations of the Warm Absorber in NGC 3783

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..127t&link_type=abstract

Astrophysical Journal v.419, p.127

Astronomy and Astrophysics

Astronomy

93

Galaxies: Individual Ngc Number: Ngc 3783, Galaxies: Seyfert, X-Rays: Galaxies

Scientific paper

We present a high signal-to-noise ROSAT position sensitive proportional counter (PSPC) observation of the Seyfert 1 galaxy NGC 3783. The 0.1-2.5 keV spectrum shows strong evidence for an absorption edge most likely associated with O VII-VIII. Such a feature, which has now been detected in a number of PSPC spectra (Nandra et al.; Nandra & Pounds; Turner et al.), is the signature of highly ionized material, the so-called warm absorber, in the line of sight to the X-ray source. The result is strongly supported by analysis of previously unpublished Ginga data and reanalysis of a 1985 EXOSAT observation of NGC 3783. We show that the warm absorber is plausibly located at a radius ≲1018 cm from the X-ray source, possibly in an outflowing wind.

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