The geometry and kinematics of the broad-line region in ngc 5548 fromhst and iue observations

Ignaz Wanders; Mike R. Goad; Kirk T. Korista; Bradley M. Peterson; Keith Horne; Gary J. Ferland; Anuradha P. Koratkar; Richard W. Pogge; Joseph C. Shields

doi:10.1086/309750

The geometry and kinematics of the broad-line region in ngc 5548 fromhst and iue observations

Ignaz Wanders, Mike R. Goad, Kirk T. Korista, Bradley M. Peterson, Keith Horne, Gary J. Ferland, Anuradha P. Koratkar, Richard W. Pogge, Joseph C. Shields

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63 Scopus citations

Abstract

The spatial and radial velocity distribution of broad-line-emitting gas in the Seyfert 1 galaxy NGC 5548 is examined through the process of reverberation mapping, which is done by detailed comparison of continuum and emission-line variations. Recent spectroscopic monitoring of NGC 5548 with HST and IUE allows us to resolve the “transfer function” (TF) that relates the continuum and emission-line variability. We also examine the radial velocity-resolved TFs, and confirm that predominantly radial motions of the line-emitting clouds can be excluded. We find that a broad-line region comprised of clouds that are orbiting a central source of mass -108 MQ along randomly inclined Keplerian orbits and irradiated by a beamed continuum source yields a TF and line profile that are qualitatively consistent with the observations. In this model, the clouds that produce the variable C IV emission lie within 12 lt-days of the central source, and the continuum radiation is confined to a wide biconical beam (semi-opening angle 35°-60°) with the observer viewing into the cone.

Original language	English
Pages (from-to)	L87-L90
Journal	Astrophysical Journal
Volume	453
Issue number	2
DOIs	https://doi.org/10.1086/309750
State	Published - Nov 10 1995

Bibliographical note

Funding Information:
We thank Matt Malkan for helpful comments. We wish to thank Frank Pijpers for supplying the SOLA code used here. We gratefully acknowledge support for this work by NASA through grants NAG5-2477 and NAGW-3315 and through grants GO-3484.01-91A and AR-5280.01-93A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. I. W. acknowledges support from The Ohio State University through a University Fellowship. M. R. G. thanks The Ohio State University, and M. R. G. and I. W. thank the University of Kentucky for hospitality during part of this work.

Keywords

Galaxies: Active galaxies: Individual (NGC 5548) quasars: Emission lines

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/309750

Cite this

@article{96b30e885e734d10b299fa29d052c188,

title = "The geometry and kinematics of the broad-line region in ngc 5548 fromhst and iue observations",

abstract = "The spatial and radial velocity distribution of broad-line-emitting gas in the Seyfert 1 galaxy NGC 5548 is examined through the process of reverberation mapping, which is done by detailed comparison of continuum and emission-line variations. Recent spectroscopic monitoring of NGC 5548 with HST and IUE allows us to resolve the “transfer function” (TF) that relates the continuum and emission-line variability. We also examine the radial velocity-resolved TFs, and confirm that predominantly radial motions of the line-emitting clouds can be excluded. We find that a broad-line region comprised of clouds that are orbiting a central source of mass -108 MQ along randomly inclined Keplerian orbits and irradiated by a beamed continuum source yields a TF and line profile that are qualitatively consistent with the observations. In this model, the clouds that produce the variable C IV emission lie within 12 lt-days of the central source, and the continuum radiation is confined to a wide biconical beam (semi-opening angle 35°-60°) with the observer viewing into the cone.",

keywords = "Galaxies: Active galaxies: Individual (NGC 5548) quasars: Emission lines",

author = "Ignaz Wanders and Goad, {Mike R.} and Korista, {Kirk T.} and Peterson, {Bradley M.} and Keith Horne and Ferland, {Gary J.} and Koratkar, {Anuradha P.} and Pogge, {Richard W.} and Shields, {Joseph C.}",

note = "Funding Information: We thank Matt Malkan for helpful comments. We wish to thank Frank Pijpers for supplying the SOLA code used here. We gratefully acknowledge support for this work by NASA through grants NAG5-2477 and NAGW-3315 and through grants GO-3484.01-91A and AR-5280.01-93A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. I. W. acknowledges support from The Ohio State University through a University Fellowship. M. R. G. thanks The Ohio State University, and M. R. G. and I. W. thank the University of Kentucky for hospitality during part of this work.",

year = "1995",

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doi = "10.1086/309750",

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AU - Wanders, Ignaz

AU - Goad, Mike R.

AU - Korista, Kirk T.

AU - Peterson, Bradley M.

AU - Horne, Keith

AU - Ferland, Gary J.

AU - Koratkar, Anuradha P.

AU - Pogge, Richard W.

AU - Shields, Joseph C.

N1 - Funding Information: We thank Matt Malkan for helpful comments. We wish to thank Frank Pijpers for supplying the SOLA code used here. We gratefully acknowledge support for this work by NASA through grants NAG5-2477 and NAGW-3315 and through grants GO-3484.01-91A and AR-5280.01-93A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. I. W. acknowledges support from The Ohio State University through a University Fellowship. M. R. G. thanks The Ohio State University, and M. R. G. and I. W. thank the University of Kentucky for hospitality during part of this work.

PY - 1995/11/10

Y1 - 1995/11/10

N2 - The spatial and radial velocity distribution of broad-line-emitting gas in the Seyfert 1 galaxy NGC 5548 is examined through the process of reverberation mapping, which is done by detailed comparison of continuum and emission-line variations. Recent spectroscopic monitoring of NGC 5548 with HST and IUE allows us to resolve the “transfer function” (TF) that relates the continuum and emission-line variability. We also examine the radial velocity-resolved TFs, and confirm that predominantly radial motions of the line-emitting clouds can be excluded. We find that a broad-line region comprised of clouds that are orbiting a central source of mass -108 MQ along randomly inclined Keplerian orbits and irradiated by a beamed continuum source yields a TF and line profile that are qualitatively consistent with the observations. In this model, the clouds that produce the variable C IV emission lie within 12 lt-days of the central source, and the continuum radiation is confined to a wide biconical beam (semi-opening angle 35°-60°) with the observer viewing into the cone.

AB - The spatial and radial velocity distribution of broad-line-emitting gas in the Seyfert 1 galaxy NGC 5548 is examined through the process of reverberation mapping, which is done by detailed comparison of continuum and emission-line variations. Recent spectroscopic monitoring of NGC 5548 with HST and IUE allows us to resolve the “transfer function” (TF) that relates the continuum and emission-line variability. We also examine the radial velocity-resolved TFs, and confirm that predominantly radial motions of the line-emitting clouds can be excluded. We find that a broad-line region comprised of clouds that are orbiting a central source of mass -108 MQ along randomly inclined Keplerian orbits and irradiated by a beamed continuum source yields a TF and line profile that are qualitatively consistent with the observations. In this model, the clouds that produce the variable C IV emission lie within 12 lt-days of the central source, and the continuum radiation is confined to a wide biconical beam (semi-opening angle 35°-60°) with the observer viewing into the cone.

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The geometry and kinematics of the broad-line region in ngc 5548 fromhst and iue observations

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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