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Title: Reddening, emission-line, and intrinsic absorption properties in the Narrow-Line Seyfert 1 Galaxy Arakelian 564
Authors: Crenshaw, D. M.
Kraemer, S. B.
Turner, T. J.
Collier, S.
Peterson, B. M.
Brandt, W. N.
Clavel, J.
George, I. M.
Horne, K.
Kriss, G. A.
Mathur, S.
Netzer, H.
Pogge, R. W.
Pounds, K. A.
Romano, P.
Shemmer, O.
Wamsteker, W.
First Published: 2-Feb-2002
Publisher: American Astronomical Society, IOP Publishing
Citation: Astrophysical Journal, 2002, 566 (1), pp. 187-194
Abstract: We use Hubble Space Telescope UV and optical spectra of the narrow-line Seyfert 1 (NLS1) galaxy Ark 564 to investigate its internal reddening and properties of its emission-line and intrinsic UV absorption gas. We find that the extinction curve of Ark 564, derived from a comparison of its UV/optical continuum to that of an unreddened NLS1, lacks a 2200 Å bump and turns up toward the UV at a longer wavelength (4000 Å) than the standard Galactic, LMC, and SMC curves. However, it does not show the extremely steep rise to 1200 Å that characterizes the extinction curve of the Seyfert 1 galaxy NGC 3227. The emission lines and continuum experience the same amount of reddening, indicating the presence of a dust screen that is external to the narrow-line region. Echelle spectra from the Space Telescope Imaging Spectrograph show intrinsic UV absorption lines due to Lyα, N V, C IV, Si IV, and Si III, centered at a radial velocity of -190 km s-1 (relative to the host galaxy). Photoionization models of the UV absorber indicate that it has a sufficient column (NH = 1.6 × 1021 cm-2) and is at a sufficient distance from the nucleus (D > 95 pc) to be the source of the dust screen. Thus, Ark 564 contains a dusty "lukewarm absorber" similar to that seen in NGC 3227.
ISSN: 0004-637X
eISSN: 1538-4357
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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