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Far‐Ultraviolet Spectroscopic ExplorerObservations of the Narrow‐Line Seyfert 1 Galaxy Arakelian 564

Authors :
Bradley M. Peterson
P. Romano
S. Mathur
Joanna Kuraszkiewicz
R. W. Pogge
Source :
The Astrophysical Journal. 578:64-73
Publication Year :
2002
Publisher :
American Astronomical Society, 2002.

Abstract

We present a 63 ks FUSE observation of the Narrow-Line Seyfert 1 galaxy Arakelian 564. The spectrum is dominated by the strong emission in the O VI \lambda\lambda1032, 1038 resonance doublet. Strong, heavily saturated absorption troughs due to Lyman series of Hydrogen, O VI and C III \lambda 977 at velocities near the systemic redshift of Arakelian564 are also observed. We used the column densities of O VI and C III in conjunction with the published column densities of species observed in the UV and X-ray bands to derive constraints on the physical parameters of the absorber through photoionization modeling. The available data suggest that the UV and X-ray absorbers in Arakelian~564 are physically related, and possibly identical. The combination of constraints indicates that the absorber is characterized by a narrow range in total column density N_H and U, centered at log N_H ~ 21 and log U ~ -1.5, and may be spatially extended along the line of sight.

Details

ISSN :
15384357 and 0004637X
Volume :
578
Database :
OpenAIRE
Journal :
The Astrophysical Journal
Accession number :
edsair.doi...........ec95225a75b166f258aed6d1abef1916