On the nature of intrinsic absorption in reddened Seyfert 1 galaxies

We discuss the origin of the "dusty lukewarm absorber," which we previously identified in the reddened Seyfert 1 galaxies NGC 3227 and Akn 564. This a bsorber is characterized by saturated UV absorption lines (C IV, N v) near the systemic velocity of the host galaxy and is likely responsible for redd ening both the continuum and emission lines (including those from the narro w-line region) from these Seyfert galaxies. From a large sample of Seyfert 1 galaxies, we find that continuum reddening (as measured by UV color) tend s to increase with inclination of the host galaxy. Furthermore, reddened in clined Seyfert galaxies observed at moderate to high spectral resolution al l show evidence for dusty lukewarm absorbers. We suggest that these absorbe rs lie in the plane of the host galaxy at distances of greater than or simi lar to 100 pc from the nucleus and are physically distinct from the majorit y of intrinsic absorbers that are outflowing from the nucleus.