Consequences of Super-Solar Metal Abundances in Narrow-line Seyfert 1 Galaxies: The Case of PG1404+226

Details Consequences of Super-Solar Metal Abundances in Narrow-line Seyfert 1 Galaxies: The Case of PG1404+226 Consequences of Super-Solar Metal Abundances in Narrow-line Seyfert 1 Galaxies: The Case of PG1404+226

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.0407k&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #04.07; Bulletin of the American Astronomical Society, Vol. 32, p.1188

Astronomy and Astrophysics

Astronomy

Scientific paper

PG 1404+226 belongs to the class of Narrow-Line Seyfert 1 galaxies which are characterized by steep soft X-ray spectra, narrow optical Balmer lines and strong FeII emission. The X-ray spectrum of PG 1404+226 shows an interesting peculiarity: an absorption feature around ~1.1 keV (Ulrich & Molendi 1996) of presently unclear origin. Warm absorbers, observed in the X-ray spectra of many AGN, do show such features, but the strongest absorption edges in case of solar metal abundances are those of Oxygen located at lower energies, around 0.74 (OVII) and 0.87 (OVIII) keV. In addition, the UV spectrum of PG 1404+226 exhibits a quite strong absorption line of NV. We explore interpretations of these unusual UV-X-ray properties in terms of non-solar metal abundances of the absorbing gas. X-ray spectral fits are combined with a UV curve of growth analysis, employing the equivalent widths measured by Ulrich et al. (2000). We then examine how the multiphase broad-line-region cloud equilibrium changes in dependence of elemental abundances and X-ray continuum shape. Finally, we discuss consequences for the evolutionary state of PG 1404+226 and Narrow-line Seyfert 1 galaxies in general, based on the recent work of Mathur (2000).

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