Browsing by Keyword "Quasars: emission lines"
Now showing items 1-8 of 8
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A Chandra Survey of Broad Absorption Line Quasars
(IOP Publishing, 2001)We have carried out a survey with the Chandra X-Ray Observatory of a sample of 10 bright broad absorption line (BAL) quasars (QSOs). Eight of 10 sources are detected. The six brightest sources have only high-ionization ... -
Clues to Quasar Broad-Line Region Geometry and Kinematics
(IOP Publishing, 2000)We present evidence that the high-velocity C IV λ1549 emission-line gas of radio-loud quasars may originate in a disklike configuration, in close proximity to the accretion disk often assumed to emit the low-ionization ... -
An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zwicky 1
(IOP Publishing, 2001)We present an empirical template spectrum suitable for fitting and subtracting/studying the Fe II and Fe III emission lines in the rest frame ultraviolet spectra of quasars and active galactic nuclei, the first empirical ... -
Investigation of the Relation between the Spectral Energy Distributions and the Emission Lines in Low‐Redshift Quasars
(IOP Publishing, 1999)We investigate the relations between the observed emission-line strengths, widths, and continuum properties of a sample of 41 low-redshift (z<1) quasars for which contemporaneous IR/soft X-ray spectral energy distributions ... -
[O II] Emission, Eigenvector 1, and Orientation in Radio-quiet Quasars
(IOP Publishing, 2000)We present supportive evidence that the Boroson & Green eigenvector 1 is not driven by source orientation and further that both [O III] λ5007 and [O II] λ3727 are isotropically emitted in the radio-quiet sample of bright ... -
The PG X-Ray QSO Sample: Links between the Ultraviolet–X-Ray Continuum and Emission Lines
(IOP Publishing, 1999)Two sets of relationships relate QSO UV to soft X-ray continua with the broad-line region. These are (i) the Baldwin relationships, which are inverse relationships between the broad-line equivalent width and the continuum ... -
Suzaku Monitoring of the Iron K Emission Line in the Type 1 Active Galactic Nucleus Ngc 5548
(IOP Publishing, 2010)We present seven sequential weekly observations of NGC 5548 conducted in 2007 with the Suzaku X-ray Imaging Spectrometer (XIS) in the 0.2–12 keV band and Hard X-ray Detector (HXD) in the 10–600 keV band. The iron Kα line ... -
Suzaku Monitoring of the Seyfert 1 Galaxy Ngc 5548: Warm Absorber Location and Its Implication for Cosmic Feedback
(IOP Publishing, 2010)We present seven sequential weekly observations of NGC 5548 conducted in 2007 with the Suzaku X-ray Imaging Spectrometer (XIS) in the 0.2–12 keV band and Hard X-ray Detector (HXD) in the 10–600 keV band. The iron Kα line ...