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PHYSICAL CONDITIONS IN THE ULTRAVIOLET ABSORBERS OF IRAS F22456−5125

We present the ultraviolet (UV) and X-ray spectra observed with the Far Ultraviolet Spectroscopic Explorer (FUSE) and the XMM-Newton satellite, respectively, of the low-z Seyfert 1 galaxy IRAS F22456 − 5125. This object shows absorption from five distinct, narrow kinematic components that span a significant range in velocity (∼0 to −700 km s−1) and ionization (Lyman series, C iii, N iii, and O vi). We also show that three of the five kinematic components in these lines appear to be saturated in Lyβ λ1026 and that all five components show evidence of saturation in the O vi doublet lines λλ1032, 1038. Further, all five components show evidence for partial covering due to the absorption seen in the O vi doublet. This object is peculiar because it shows no evidence for corresponding X-ray absorption to the UV absorption in the X-ray spectrum, which violates the 1:1 correlation known for low-z active galactic nuclei (AGNs). We perform photoionization modeling of the UV absorption lines and predict that the O vii column density should be small, which would produce little to no absorption in agreement with the X-ray observation. We also examine the UV variability of the continuum flux for this object (an increase of a factor of 6). As the absorption components lack variability, we find a lower limit of ∼20 kpc for the distance for the absorbers from the central AGN.