Patrick B. Hall
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View article: The SDSS-V Black Hole Mapper Reverberation Mapping Project: Light Echoes of the Coronal Line Region in a Luminous Quasar
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Light Echoes of the Coronal Line Region in a Luminous Quasar Open
We present a reverberation mapping analysis of the coronal line [Ne V]$λ$3427 emitting region of the quasar COS168 (SDSS J095910.30+020732.2). [Ne V]$λ$3427 is known as one of the "coronal lines," which are a species of emission lines pres…
View article: The SDSS-V Black Hole Mapper Reverberation Mapping Project: Multiline Dynamical Modeling of a Highly Variable Active Galactic Nucleus with Decade-long Light Curves
The SDSS-V Black Hole Mapper Reverberation Mapping Project: Multiline Dynamical Modeling of a Highly Variable Active Galactic Nucleus with Decade-long Light Curves Open
We present dynamical modeling of the broad-line region (BLR) of the highly variable active galactic nucleus (AGN) SDSS J141041.25+531849.0 ( z = 0.359) using photometric and spectroscopic monitoring data from the Sloan Digital Sky Survey (…
View article: Massive Extremely High-velocity Outflow in the Quasar J164653.72+243942.2
Massive Extremely High-velocity Outflow in the Quasar J164653.72+243942.2 Open
We present analysis of one of the most extreme quasar outflows found to date in our survey of extremely high-velocity outflows (EHVOs). J164653.72+243942.2 ( z em ∼ 3.04) shows variable C iv λλ 1548,1551 absorption at speeds larger than 0.…
View article: Massive Extremely High-Velocity Outflow in the Quasar J164653.72+243942.2
Massive Extremely High-Velocity Outflow in the Quasar J164653.72+243942.2 Open
We present the analysis of one of the most extreme quasar outflows found to date in our survey of extremely high velocity outflows (EHVO). J164653.72+243942.2 (z ~ 3.04) shows variable CIV1548,1551 absorption at speeds larger than 0.1c, ac…
View article: Sloan Digital Sky Survey-V: Pioneering Panoptic Spectroscopy
Sloan Digital Sky Survey-V: Pioneering Panoptic Spectroscopy Open
The Sloan Digital Sky Survey-V (SDSS-V) is pioneering panoptic spectroscopy: it is the first all-sky, multi-epoch, optical-to-infrared spectroscopic survey. SDSS-V is mapping the sky with multi-object spectroscopy (MOS) at telescopes in bo…
View article: The Nineteenth Data Release of the Sloan Digital Sky Survey
The Nineteenth Data Release of the Sloan Digital Sky Survey Open
Mapping the local and distant Universe is key to our understanding of it. For decades, the Sloan Digital Sky Survey (SDSS) has made a concerted effort to map millions of celestial objects to constrain the physical processes that govern our…
View article: The Sloan Digital Sky Survey Reverberation Mapping Project: Insights on Maximizing Efficiency in Lag Measurements and Black Hole Masses
The Sloan Digital Sky Survey Reverberation Mapping Project: Insights on Maximizing Efficiency in Lag Measurements and Black Hole Masses Open
Multiyear observations from the Sloan Digital Sky Survey (SDSS) Reverberation Mapping (RM) project have significantly increased the number of quasars with reliable RM lag measurements. We statistically analyze target properties, light-cur…
View article: Erratum: “The Farthest Quasar Mini-Broad Absorption Line Outflow from Its Central Source: Very Large Telescope/UVES Observation of SDSS J0242+0049” (2022, ApJ, 927, 176)
Erratum: “The Farthest Quasar Mini-Broad Absorption Line Outflow from Its Central Source: Very Large Telescope/UVES Observation of SDSS J0242+0049” (2022, ApJ, 927, 176) Open
View article: Erratum: “Acceleration and Substructure Constraints in a Quasar Outflow” (2007, ApJ, 665, 174)
Erratum: “Acceleration and Substructure Constraints in a Quasar Outflow” (2007, ApJ, 665, 174) Open
peer reviewed
View article: The Sloan Digital Sky Survey Reverberation Mapping Project: Insights on Maximizing Efficiency in Lag Measurements and Black-Hole Masses
The Sloan Digital Sky Survey Reverberation Mapping Project: Insights on Maximizing Efficiency in Lag Measurements and Black-Hole Masses Open
Multi-year observations from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project have significantly increased the number of quasars with reliable reverberation-mapping lag measurements. We statistically analyze target prop…
View article: The SDSS-V Black Hole Mapper Reverberation Mapping Project: A Kinematically Variable Broad-Line Region and Consequences for Masses of Luminous Quasars
The SDSS-V Black Hole Mapper Reverberation Mapping Project: A Kinematically Variable Broad-Line Region and Consequences for Masses of Luminous Quasars Open
We present a velocity-resolved reverberation mapping analysis of the hypervariable quasar RM160 (SDSS J141041.25+531849.0) at z = 0.359 with 153 spectroscopic epochs of data representing a ten-year baseline (2013-2023). We split the baseli…
View article: Understanding the Broad-line Region of Active Galactic Nuclei with Photoionization. I. the Moderate-Accretion Regime
Understanding the Broad-line Region of Active Galactic Nuclei with Photoionization. I. the Moderate-Accretion Regime Open
Over three decades of reverberation mapping (RM) studies on local broad-line active galactic nuclei (AGNs) have measured reliable black-hole (BH) masses for $> 100$ AGNs. These RM measurements reveal a significant correlation between the B…
View article: AGN STORM 2: IX. Studying the Dynamics of the Ionized Obscurer in Mrk 817 with High-resolution X-ray Spectroscopy
AGN STORM 2: IX. Studying the Dynamics of the Ionized Obscurer in Mrk 817 with High-resolution X-ray Spectroscopy Open
We present the results of the XMM-Newton and NuSTAR observations taken as part of the ongoing, intensive multi-wavelength monitoring program of the Seyfert 1 galaxy Mrk 817 by the AGN Space Telescope and Optical Reverberation Mapping 2 (AG…
View article: Quasar Winds Caught on Acceleration and Deceleration
Quasar Winds Caught on Acceleration and Deceleration Open
We present an observational study of wind acceleration based on four low-ionization broad absorption line (BAL) quasars (J0136, J1238, J1259, and J1344). J0136 and J1344 (group 1) are radio-quiet and show large BAL-velocity shifts as oppos…
View article: AGN STORM 2. V. Anomalous Behavior of the C <scp>iv</scp> Light Curve of Mrk 817*
AGN STORM 2. V. Anomalous Behavior of the C <span>iv</span> Light Curve of Mrk 817* Open
An intensive reverberation mapping campaign of the Seyfert 1 galaxy Mrk 817 using the Cosmic Origins Spectrograph on the Hubble Space Telescope revealed significant variations in the response of broad UV emission lines to fluctuations in t…
View article: Quasar Outflow Deceleration or Acceleration: Predictions and a Search
Quasar Outflow Deceleration or Acceleration: Predictions and a Search Open
Quasar winds can shock and sweep up ambient interstellar medium (ISM) gas, contributing to galactic quenching. We combine and extend past models of energy-conserving shock bubbles around quasars, investigate model implications from an obse…
View article: Quasar winds caught on acceleration and deceleration
Quasar winds caught on acceleration and deceleration Open
We present an observational study of wind acceleration based on four low-ionization broad absorption line (LoBAL) quasars (J0136, J1238, J1259, J1344). J0136 and J1344 (group-1) are radio quiet and show large BAL-velocity shifts as opposed…
View article: High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam
High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam Open
High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4m Blanco tele…
View article: AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817
AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817 Open
We fit the UV/optical lightcurves of the Seyfert 1 galaxy Mrk 817 to produce maps of the accretion disk temperature fluctuations δ T resolved in time and radius. The δ T maps are dominated by coherent radial structures that move slowly ( v…
View article: AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817
AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817 Open
We fit the UV/optical lightcurves of the Seyfert 1 galaxy Mrk 817 to produce maps of the accretion disk temperature fluctuations $δT$ resolved in time and radius. The $δT$ maps are dominated by coherent radial structures that move slowly (…
View article: Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIII. Ultraviolet Time Lag of H$β$ Emission in Mrk 142
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XIII. Ultraviolet Time Lag of H$β$ Emission in Mrk 142 Open
We performed a rigorous reverberation-mapping analysis of the broad-line region (BLR) in a highly accreting ($L/L_{\mathrm{Edd}}=0.74-3.4$) active galactic nucleus, Markarian 142 (Mrk 142), for the first time using concurrent observations …
View article: Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041
Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041 Open
Context. Accretion disk winds launched close to supermassive black holes (SMBHs) are a viable mechanism providing feedback between the SMBH and the host galaxy. Aims. We aim to characterize the X-ray properties of the inner accretion disk …
View article: The Sloan Digital Sky Survey Reverberation Mapping Project: Investigation of Continuum Lag Dependence on Broad-Line Contamination and Quasar Properties
The Sloan Digital Sky Survey Reverberation Mapping Project: Investigation of Continuum Lag Dependence on Broad-Line Contamination and Quasar Properties Open
This work studies the relationship between accretion-disk size and quasar properties, using a sample of 95 quasars from the SDSS-RM project with measured lags between the $g$ and $i$ photometric bands. Our sample includes disk lags that ar…
View article: AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817
AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817 Open
An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the broad UV emission lines to fl…
View article: AGN STORM 2. IV. Swift X-ray and ultraviolet/optical monitoring of Mrk 817
AGN STORM 2. IV. Swift X-ray and ultraviolet/optical monitoring of Mrk 817 Open
The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad emission line region and out to the dusty torus. As part of this c…
View article: Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041
Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041 Open
Accretion disk winds launched close to supermassive black holes (SMBHs) are a viable mechanism to provide feedback between the SMBH and the host galaxy. We aim to characterize the X-ray properties of the inner accretion disk wind of the ne…
View article: AGN STORM 2. II. Ultraviolet Observations of Mrk 817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope*
AGN STORM 2. II. Ultraviolet Observations of Mrk 817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope* Open
We present reverberation mapping measurements for the prominent ultraviolet broad emission lines of the active galactic nucleus Mrk 817 using 165 spectra obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Our ultr…
View article: The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results
The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results Open
We present the final data from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project, a precursor to the SDSS-V Black Hole Mapper Reverberation Mapping program. This data set includes 11-year photometric and 7-year spectrosc…
View article: Revisiting Emission-Line Measurement Methods for Narrow-Line Active Galactic Nuclei
Revisiting Emission-Line Measurement Methods for Narrow-Line Active Galactic Nuclei Open
Measuring broad emission-line widths in active galactic nuclei (AGN) is not straightforward owing to the complex nature of flux variability in these systems. Line-width measurements become especially challenging when signal-to-noise is low…
View article: AGN STORM 2. III. A NICER view of the variable X-ray obscurer in Mrk 817
AGN STORM 2. III. A NICER view of the variable X-ray obscurer in Mrk 817 Open
The AGN STORM 2 collaboration targeted the Seyfert 1 galaxy Mrk 817 for a year-long multiwavelength, coordinated reverberation mapping campaign including HST, Swift, XMM-Newton, NICER, and ground-based observatories. Early observations wit…