The Quasar Outflow Contribution to AGN Feedback: VLT Measurements of SDSS J0318-0600 (2009)
Dunn, Jay P., Bautista, Manuel A., Arav, Nahum, Moe, Maxwell, Korista, Kirk T., Costantini, Elisa, ...
We present high spectral resolution VLT observations of the BAL quasar SDSS J0318-0600. This high quality data set allows us to extract accurate ionic column densities and determine an electron...
Quasar Outflow Contribution to AGN Feedback: Observations of QSO SDSS J0838+2955 (2009)
Moe, Maxwell, Arav, Nahum, Bautista, Manuel A., Korista, Kirk T.
We present a detailed analysis of the Astrophysical Research Consortium 3.5 m telescope spectrum of QSO SDSS J0838+2955. The object shows three broad absorption line (BAL) systems at 22,000, 13,000,...
Measuring Column Densities in Quasar Outflows: VLT Observations of QSO 2359-1241 (2008)
Arav, Nahum, Moe, Maxwell, Costantini, Elisa, Korista, Kirk T., Benn, Chris, Ellison, Sara
We present high resolution spectroscopic VLT observations of the outflow seen in QSO 2359-1241. These data contain absorption troughs from five resonance Fe II lines with a resolution of ~7 km/s and...
On the size of the Fe II emitting region in the AGN Akn 120 (2007)
Kuehn, Charles A., Baldwin, Jack A., Peterson, Bradley M., Korista, Kirk T.
We present a reverberation analysis of the strong, variable optical Fe II emission bands in the spectrum of Akn 120, a low-redshift AGN which is one of the best candidates for such a study. On time...
The Near-Infrared Broad Emission Line Region of Active Galactic Nuclei -- I. The Observations (2007)
Landt, Hermine, Bentz, Misty C., Ward, Martin J., Elvis, Martin, Peterson, Bradley M., Korista, Kirk T., ...
We present high quality (high signal-to-noise ratio and moderate spectral resolution) near-infrared (near-IR) spectroscopic observations of 23 well-known broad-emission line active galactic nuclei...
HUBBLE SPACE TELESCOPE ULTRAVIOLET SPECTROSCOPY OF 14 LOW-REDSHIFT QUASARS (2007)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low-redshift (zem ≤ 0:8) quasars observed with the Hubble Space Telescope STIS as part of a Snapshot project to understand the relationship...
Chemical Abundances in AGN Environment: X-Ray/UV Campaign on the MRK 279 Outflow (2006)
Arav, Nahum, Gabel, Jack R., Korista, Kirk T., Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, ...
We present the first reliable determination of chemical abundances in an AGN outflow. The abundances are extracted from the deep and simultaneous FUSE and HST/STIS observations of Mrk 279. This data...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, L. Aldcroft, Thomas, ...
We present low-resolution ultraviolet spectra of 14 low redshift (z em < 0.8) quasars observed with HST/STIS as part of a Snap project to understand the relationship between quasar outflows and...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low redshift (z
Gabel, Jack R., Arav, Nahum, Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, Costantini, Elisa, ...
We present an analysis of the intrinsic UVabsorption in the Seyfert 1 galaxy Mrk 279 based on simultaneous long observations with the Hubble Space Telescope (41 ks) and the Far Ultraviolet...
Gabel, Jack R., Arav, Nahum, Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, Costantini, Elisa, ...
We present an analysis of the intrinsic UV absorption in the Seyfert 1 galaxy Mrk 279 based on simultaneous long observations with the Hubble Space Telescope (41 ks) and the Far Ultraviolet...
Iron Abundance Diagnostics in High-Redshift QSOs (2004)
Corbin, Michael R., Korista, Kirk T., Kodituwakku, Nalaka, Freduling, Wolfram
The abundance of alpha-process elements such as magnesium and carbon relative to iron measured from the broad emission lines of QSOs can serve as a diagnostic of the star formation and chemical...
X-ray/UV Campaign on the Mrk 279 AGN Outflow: Constraining Inhomogeneous Absorber Models (2004)
Arav, Nahum, Kaastra, Jelle, Kriss, Gerard A., Korista, Kirk T., Gabel, Jack, Proga, Daniel
We investigate the applicability of inhomogeneous absorber models in the formation of AGN outflow absorption-troughs. The models we explore are limited to monotonic gradients of absorbing column...
Korista, Kirk T., Goad, Michael R.
We investigate the effect of a global change in the ionizing continuum level on the behavior of the strong optical broad emission-lines seen in spectra of the nuclear emission-line regions of active...
Iron Emission in z ~ 6 QSOs and its Possible Implications (2003)
Corbin, Michael R., Freudling, Wolfram, Korista, Kirk. T.
We have obtained low-resolution near-infrared spectra of five SDSS QSOs at 5.3 < z < 6.3 using the NICMOS instrument of the Hubble Space Telescope. We find evidence of emission in the Fe II complex...
Iron Emission in z~6 QSOs (2003)
Freudling, Wolfram, Corbin, Michael R., Korista, Kirk T.
We have obtained low-resolution near infrared spectra of three QSOs at 5.7 < z < 6.3 using the NICMOS instrument of the Hubble Space Telescope. The spectra cover the rest-frame ultraviolet emission...
Contrasting the UV and X-ray O VI Column Density Inferred for the Outflow in NGC 5548 (2003)
Arav, Nahum, Kaastra, Jelle, Steenbrugge, Katrien, Brinkman, Bert, Edelson, Rick, Korista, Kirk T., ...
We compare X-ray and UV spectroscopic observations of NGC 5548. Both data sets show O VI absorption troughs associated with the AGN outflow from this galaxy. We find that the robust lower limit on...
Quasar Tomography: Unification of Echo Mapping and Photoionisation Models (2002)
Horne, Keith, Korista, Kirk T, Goad, Michael R
Reverberation mapping uses time-delayed variations in photoionised emission lines to map the geometry and kinematics of emission-line gas in active galactic nuclei. In previous work, the light travel...
On the Column Density of AGN Outflows: the Case of NGC 5548 (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T.
We re-analyze the HST high resolution spectroscopic data of the intrinsic absorber in NGC 5548 and find that the C IV absorption column density is at least four times larger than previously...
HST STIS Observations of PG 0946+301: the Highest Quality UV Spectrum of a BALQSO (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T., Crenshaw, D. Michael, Van Breugel, Wil, Brotherton, Michael, ...
We describe deep (40 orbits) HST/STIS observations of the BALQSO PG 0946+301 and make them available to the community. These observations are the major part of a multi-wavelength campaign on this...
Photoionization Models for BALQSO PG 0946+301 (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T.
This is a companion paper to the manuscript entitled: ``HST STIS Observations Of PG 0946+301: The Highest Quality UV Spectrum of a BALQSO'' (Arav et al. 2001; accepted for publication in ApJ). Here...
The Variable Diffuse Continuum Emission of Broad Line Clouds (2001)
Korista, Kirk T., Goad, Michael R.
We investigate the wavelength-dependent intensity and reverberation properties of the UV-optical diffuse continuum emission expected from broad emission line gas. The locally optimally emitting...
Keck Hires Observations of the QSO First J104459.6+365605: Evidence for a Large Scale Outflow (2000)
De Kool, Martijn, Arav, Nahum, Becker, Robert H., Gregg, Michael D., White, Richard L., Laurent-Muehleisen, Sally A., ...
This paper presents an analysis of a Keck HIRES spectrum of the QSO FIRST J104459.6+365605. The line of sight towards the QSO contains two clusters of outflowing clouds that give rise to broad blue...
Locally Optimally-Emitting Clouds and the Variable Broad Emission Line Spectrum of NGC 5548 (2000)
Korista, Kirk T., Goad, Michael R.
[abridged] We test the ``locally optimally-emitting clouds'' (LOC) model against the extensive spectroscopic data base of the Seyfert~1, NGC 5548. The time-averaged, integrated-light UV broad...
HST Observations of the Broad Absorption Line Quasar PG 0946+301 (1998)
Arav, Nahum, Korista, Kirk T., De Kool, Martijn, Junkkarinen, Vesa T., Begelman, Mitchell C.
We analyze HST and ground based spectra of the brightest BALQSO in the UV: PG~0946+301. A detailed study of the absorption troughs as a function of velocity is presented, facilitated by the use of a...
Physical Conditions of the Coronal Line Region in Seyfert Galaxies (1997)
Ferguson, Jason W., Korista, Kirk T., Ferland, Gary J.
The launch of the Infrared Space Observatory and new atomic data have opened a window to the study of high ionization gas in active galactic nuclei (AGN). We present the results of a large number of...
Locally Optimally-emitting Clouds and the Narrow Emission Lines in Seyfert Galaxies (1997)
Ferguson, Jason W., Korista, Kirk T., Baldwin, Jack A., Ferland, Gary J.
The narrow emission line spectra of active galactic nuclei are not accurately described by simple photoionization models of single clouds. Recent Hubble Space Telescope images of Seyfert 2 galaxies...