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The Astrophysical Journal Volume 698 Number 1 Create an alert RSS this journal

D. M. Crenshaw et al. 2009 ApJ 698 281 doi:10.1088/0004-637X/698/1/281

MASS OUTFLOW IN THE SEYFERT 1 GALAXY NGC 5548*

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D. M. Crenshaw1, S. B. Kraemer2, H. R. Schmitt3, J. S. Kaastra4,5, N. Arav6, J. R. Gabel7 and K. T. Korista8

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Abstract References Cited By

We present a study of the intrinsic UV absorption and emission lines in an historically low-state spectrum of the Seyfert 1 galaxy NGC 5548, which we obtained in 2004 February at high spatial and spectral resolution with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We isolate a component of emission with a width of 680 km s–1 that arises from an "intermediate-line region" (ILR), similar to that we discovered in NGC 4151, at a distance of ~1 pc from the central continuum source. From a detailed analysis of the five intrinsic absorption components in NGC 5548 and their behavior over a span of eight years, we present evidence that most of the UV absorbers only partially cover the ILR and do not cover an extended region of UV continuum emission, most likely from hot stars in the circumnuclear region. We also find that four of the UV absorbers are at much greater distances (greater than 70 pc) than the ILR, and none have sufficient N V or C IV column densities to be the ILR in absorption. At least a portion of the UV absorption component 3, at a radial velocity of –530 km s–1, is likely responsible for most of the X-ray absorption, at a distance less than 7 pc from the central source. The fact that we see the ILR in absorption in NGC 4151 and not in NGC 5548 suggests that the ILR is located at a relatively large polar angle (~45°) with respect to the narrow-line region outflow axis.


Footnote
*  Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with proposal 9511.
Keywords

galaxies: individual (NGC 5548); galaxies: Seyfert


Dates

Issue 1 (2009 June 10)

Received 2008 December 22, accepted for publication 2009 February 17

Published 2009 May 20



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