Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...481..752s&link_type=abstract
Astrophysical Journal v.481, p.752
Astronomy and Astrophysics
Astronomy
42
Galaxies: Individual Ngc Number: Ngc 3783, Galaxies: Seyfert, Ultraviolet: Galaxies, X-Rays: Galaxies
Scientific paper
The Seyfert 1 nucleus of NGC 3783 shows intrinsic absorption in ultraviolet (UV) resonance lines as well as in soft X-rays. We review existing measurements of these features and use them to place constraints on the physical conditions in the absorbing media. We find that the observed column densities are consistent with a single-phase, photoionized plasma responsible for absorption in both bandpasses, although alternative scenarios in which the UV and X-ray continuum sources are covered by distinct clouds are not excluded. If the UV and X-ray absorbers constitute a single medium in at least approximate ionization equilibrium with the nuclear radiation field, observed variability in the strength of absorption can be used to derive a lower bound on the absorber's electron density of ne >~ 50 cm-3. This result additionally implies an upper limit of about 30 pc for the separation between the nuclear continuum source and the absorbing plasma.
Hamann Fred
Shields Joseph C.
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