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  Partner: UNT College of Arts and Sciences
 Collection: UNT Scholarly Works
A Statistical Relation Between the X-ray Spectral Index and Eddington Ratio of Active Galactic Nuclei in Deep Surveys
This article presents an investigation into how well the properties of the accretion flow on to a supermassive black hole may be coupled to those of the overlying hot corona. digital.library.unt.edu/ark:/67531/metadc854090/
Recent Advances in Photoinduced Electron Transfer Processes of Fullerene-Based Molecular Assemblies and Nanocomposites
This article surveys photosensitized electron-transfer processes of fullerenes hybridized with electron donating or other electron accepting molecules. digital.library.unt.edu/ark:/67531/metadc854091/
Buckminsterfullerene, C₆₀: Improved Synthesis, Electron Microscopy, Electron States, Anions and Related Aspects
This article describes the synthesis and characterization of C₆₀, by means of electron microscopy, electron states, cyclic voltammetry and other techniques. digital.library.unt.edu/ark:/67531/metadc854092/
Investigation of Structural and Optical Properties of Ag Nanoclusters Formed in Si(100) After Multiple Implantations of Low Energies Ag Ions and Post-Thermal Annealing at a Temperature Below the Ag-Si Eutectic Point
This paper investigates the synthesis of Ag NCs in Si(100) substrate by implanting multiple energies and fluences of Ag ions and subsequent thermal annealing. digital.library.unt.edu/ark:/67531/metadc854093/
PAH Emission and Star Formation in the Host of the z ~ 2.56 Cloverleaf QSO
This article reports the first detection of the 6.2 and 7.7 μm infrared polycyclic aromatic hydrocarbon emission features in the spectrum of a high-redshift QSO, from the Spitzer IRS spectrum of the Cloverleaf lensed QSO. digital.library.unt.edu/ark:/67531/metadc854094/
Locating Star-Forming Regions in Quasar Host Galaxies
This article presents a study of the morphology and intensity of star formation in the host galaxies of eight Palomar-Green quasars using observations with the Hubble Space Telescope. digital.library.unt.edu/ark:/67531/metadc854095/
Dust Covering Factor, Silicate Emission, and Star Formation in Luminous QSOs
This article presents Spitzer IRS low resolution, mid-IR spectra of a sample of 25 high luminosity QSOs at 2 < z < 3.5. digital.library.unt.edu/ark:/67531/metadc854097/
A Population of X-Ray Weak Quasars: PHL 1811 Analogs at High Redshift
This article reports the results from Chandra and XMM-Newton observations of a sample of 10 type 1 quasars selected to have unusual UV emission-line properties similar to those of PHL 1811. digital.library.unt.edu/ark:/67531/metadc854100/
Chloring e6 Sensitized Photovoltaic Cells: Effect of Co-Adsorbents on Cell Performance, Charge Transfer Resistance, and Charge Recombination Dynamics
This article investigates the effect of dye-aggregation-preventing co-adsorbents, cholic acid and deoxycholic acid, on the performance of dye-sensitized solar cells constructed using a metal-free sensitizer, chlorin e6 adsorbed onto TiO₂ surface. digital.library.unt.edu/ark:/67531/metadc854102/
GRB 060505: A Possible Short-Duration Gamma-Ray Burst in a Star-Forming Region at a Redshift of 0.09
This article reports the discovery of the GRB optical afterglow and observations of its environment using Gemini South, the Hubble Space Telescope, Chandra, Swift, and the Very Large Array. digital.library.unt.edu/ark:/67531/metadc854104/
Optically Selected BL Lacertae Candidates from the Sloan Digital Sky Survey Data Release Seven
This article presents a sample of 723 optically selected BL Lac candidates from the Sloan Digital Sky Survey Data Release 7 spectroscopic database. digital.library.unt.edu/ark:/67531/metadc854105/
The X-Ray Properties of the Most Luminous Quasars From the Sloan Digital Sky Survey
This article studies the X-ray properties of a representative sample of 59 of the most optically luminous quasars in the universe spanning a redshift range of z ≈ 1.5-4.5. digital.library.unt.edu/ark:/67531/metadc854107/
Exploratory X-Ray Monitoring of Luminous Radio-Quiet Quasars at High Redshift: Initial Results
This article presents initial results from an exploratory X-ray monitoring project of two groups of comparably luminous radio-quiet quasars. digital.library.unt.edu/ark:/67531/metadc854108/
Black Hole Mass and Growth Rate at High Redshift
This article presents new H- and K-band spectroscopy of 15 high-luminosity active galactic nuclei at redshifts 2.3-3.4 obtained with Gemini South. digital.library.unt.edu/ark:/67531/metadc854109/
Star Formation in the Hosts of High-z QSOs: Evidence from Spitzer PAH Dettections
This article presents Spitzer rest frame mid-infrared spectroscopy of 12z~2 millimeter-bright type 1 QSOs. digital.library.unt.edu/ark:/67531/metadc854111/
Singlet Quenching of Tetraphenylporphyrin and its Metal Derivatives by Iron(III) Coordination Compounds
This article reports on the singlet quenching of 5, 10, 15, 20-tetraphenylporphyrin (H₂TPP) and its magnesium(II) and zinc(II) derivatives (MgTPP and ZnTPP) by a series of iron(III) coordination compounds bearing different ligand systems. digital.library.unt.edu/ark:/67531/metadc854081/
The Chandra Deep Field-South Survey: 2 Ms Source Catalogs
This article presents point-source catalogs for the ≈2 Ms exposure of the Chandra Deep Field-South. digital.library.unt.edu/ark:/67531/metadc854082/
Variability-Selected Low-Luminosity Active Galactic Nuclei in the 4 Ms Chandra Deep Field-South
This article demonstrates that the observed variability cannot be explained by X-ray Binary populations or ultraluminous X-ray sources, so the variability is most likely caused by accretion onto a supermassive black hole. digital.library.unt.edu/ark:/67531/metadc854083/
The Hard X-Ray Spectrum as a Probe for Black Hole Growth in Radio-Quiet Active Galactic Nuclei
This article studies the hard X-ray spectral properties of 10 highly luminous radio-quiet active galactic nuclei at z = 1.3-3.2, including new XMM-Newton observations of four of these sources. digital.library.unt.edu/ark:/67531/metadc854084/
X-Ray Spectral Constraints for z ≈ 2 Massive Galaxies: The Identification of Reflection-Dominated Active Galactic Nuclei
This article uses the 4 Ms Chandra Deep Field-South survey to place direct constraints on the ubiquity of z ≈ 2 heavily obscured active galactic nuclei. digital.library.unt.edu/ark:/67531/metadc854085/
On The Performance of Quasar Reverberation Mapping in the Era of Time-Domain Photometric Surveys
This article quantitatively assesses, by means of comprehensive numerical simulations, the ability of broadband photometric surveys to recover the broad emission line region size in quasars under various observing conditions and for a wide range of object properties. digital.library.unt.edu/ark:/67531/metadc854087/
The X-Ray Properties of the Optically Brightest Mini-Bal Quasars from the Sloan Digital Sky Survey
This article compiles a sample of 14 of the optically brightest radio-quiet quasars in the Sloan Digital Sky Survey Data Release 5 quasar catalog that have mini-broad absorption lines present in their spectra. digital.library.unt.edu/ark:/67531/metadc849975/
The Lack of Torus Emission from BL Lacertae Objects: An Infrared View of Unification with WISE
This article uses data from the Wide-Field Infrared Survey Explorer to perform a statistical study on the mid-infrared properties of a large number of BL Lac objects. digital.library.unt.edu/ark:/67531/metadc849976/
X-Ray Insights Into the Nature of Weak Emission-Line Quasars at High Redshift
This article presents Chandra observations of nine high-redshift quasars discovered by the Sloan Digital Sky Survey with weak or undetectable high-ionization emission lines in their UV spectra. digital.library.unt.edu/ark:/67531/metadc849977/
The 4Ms Chandra Deep Field-South Number Counts Apportioned By Source Class: Pervasive Active Galactic Nuclei and the Ascent of Normal Galaxies
This article presents cumulative and differential number-count measurements for the recently completed 4 Ms Chandra Deep Field-South survey. digital.library.unt.edu/ark:/67531/metadc849979/
Weak Line Quasars at High Redshift: Extremely High Accretion Rates or Anemic Broad-Line Regions?
This article presents Gemini-North K-band spectra of two representative members of the class of high-redshift quasars with exceptionally weak rest-frame ultraviolet emission lines. digital.library.unt.edu/ark:/67531/metadc849980/
A Chandra Survey of the X-Ray Properties of Board Absorption Line Radio-Loud Quasars
This article presents the results of a Chandra study of 21 broad absorption line radio-loud quasars. digital.library.unt.edu/ark:/67531/metadc849983/
The Ultraviolet-To-Mid-Infrared Spectral Energy Distribution of Weak Emission Line Quasars
This article presents Spitzer Space Telescope photometry of 18 Sloan Digital Sky Survey quasars which have weak or undetectable high-ionization emission lines in their rest-frame ultraviolet spectra. digital.library.unt.edu/ark:/67531/metadc849985/
Star Formation and Black Hole Growth at z ≃4.8
This article reports Herschel/SPIRE, Spitzer and Wide-field Infrared Survey Explorer obervations of 44 z ≃ 4.8 optically selected active galactic nuclei. digital.library.unt.edu/ark:/67531/metadc849986/
Extreme Star Formation in the Host Galaxies of the Fastest Growing Supermassive Black Holes at z = 4.8
This article reports new Herschel observations of extremely luminous optically selected active galactic nuclei. digital.library.unt.edu/ark:/67531/metadc849988/
Observational Evidence of Quasar Feedback Quenching Star Formation at High Redshift
This Letter to the Editor discusses an observational proof of quasar feedback quenching the star formation at high redshift. digital.library.unt.edu/ark:/67531/metadc849989/
High-Redshift SDSS Quasars With Weak Emission Lines
This article identifies a sample of 74 high-redshift quasars with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a subsample of four objects at z > 4. digital.library.unt.edu/ark:/67531/metadc849990/
Multiwavelength Observations of Radio-Quiet Quasars with Weak Emission Lines
This article presents radio and X-ray observations, as well as optical light curves, for a subset of 26 BL Lac candidates from the Sloan Digital Sky Survey lacking strong radio emission and with z < 2.2. digital.library.unt.edu/ark:/67531/metadc849991/
A Comprehensive Analysis of Groundwater Quality in the Barnett Shale Region
This article presents an analysis of 550 groundwater samples collected from private and public supply water wells drawing from aquifers overlying the Barnett shale formation of Texas. digital.library.unt.edu/ark:/67531/metadc849992/
The X-Ray Properties of Typical High-Redshift Radio-Loud Quasars
This article reports spectral, imaging, and variability results from four XMM-Newton observations and two Chandra observations of high-redshift radio-loud quasars. digital.library.unt.edu/ark:/67531/metadc849993/
X-Ray and Multiwavelength Insights into the Nature of Weak Emission-Line Quasars at Low Redshift
This article reports on the X-ray and multiwavelength properties of 11 radio-quiet quasars with weak or no emission lines identified by the Sloan Digital Sky Survey with redshift. digital.library.unt.edu/ark:/67531/metadc849996/
Black Hole Mass and Growth Rate at z ≃4.8: A Short Episode of Fast Growth Followed by Short Duty Cycle Activity
This article presents H-band spectroscopy for a flux-limited sample of 40 z≃ 4.8 active galactic nuclei, selected from the Sloan Digital Sky Survey. digital.library.unt.edu/ark:/67531/metadc850000/
The Chandra Deep Field-South Survey: 4 Ms Source Catalogs
This article presents source catalogs for the 4 Ms Chandra Deep Field-South. digital.library.unt.edu/ark:/67531/metadc850003/
Performance Comparison of Passive Structures with Multiple Gates and Funnels for Capturing Contaminated Groundwater
This article describes the evaluation of the capability of passive interceptors with multiple gates for directing the flow of contaminated groundwater. digital.library.unt.edu/ark:/67531/metadc848576/
Geophysical Prospecting for Oil and Gas Well Effluent
This article describes the evaluation of the utility of an earth resistivity system for detecting drilling effluent at a site in the Trinity Group outcrop zone. digital.library.unt.edu/ark:/67531/metadc848577/
Two Reflections on the Symbolic Position of Business Anthology
This article provides comments and reflection on the symbolic position of business anthropology with mainstream anthropology. digital.library.unt.edu/ark:/67531/metadc848590/
Creased-Plastic Rock Permeameter for Hydrogeology Students
This article discusses the use of creased-plastic permeameters as an inexpensive way for students to estimate the hydraulic conductivity of local rock aquifers. digital.library.unt.edu/ark:/67531/metadc848593/
Hydrogeology Lessons and Exercises for Introductory Physical-Geology Students
This article describes the creation of instruction models for an undergraduate physical-geology course. digital.library.unt.edu/ark:/67531/metadc848597/
Comments Concerning Solvent Effects on Chemical Processes. Part 7. Quantitative Description of the Composition Dependence of the Solvent Polarity Measure ET(30) in Binary Aqueous-Organic Solvent Mixtures
This article critically examines a two-step solvational model for mathematically describing the spectral properties of the DImroth-Reichardt betaine dye ET in binary aqueous-organic solvent mixures. digital.library.unt.edu/ark:/67531/metadc848601/
"No More Cakes and Ale?" Discovering Ethical Gray Areas in a Design Anthropology Class
This article examines how ethics were learned in a design anthropology class. digital.library.unt.edu/ark:/67531/metadc848604/
Oil Production and Groundwater Quality in the Edwards-Trinity Plateau Aquifer, Texas
This article suggests that evaporite dissolution and oilfield brine locally impact the Edwards-Trinity Plateau Aquifer, but the problem is not regionally pervasive. digital.library.unt.edu/ark:/67531/metadc848607/
A Graben in the Eagle Ford Shale, Lewisville, Texas
This article describes a graben bounded by normal faults in an outcrop of the Eagle Ford formation within Denton County. digital.library.unt.edu/ark:/67531/metadc848609/
Controlling Gully Erosion with Earth Dams in North-Central Texas
This article describes the use of earth dams for controlling gully erosion in part of the Eastern Cross Timbers of North-Central Texas. digital.library.unt.edu/ark:/67531/metadc848618/
Efficiency Comparison of Variably-Spaced, Non-Pumped Wells for Filtering Polluted Groundwater
This article investigates the capability of variably-spaced arrays of non-pumped wells, filled with reactive media, to filter a hypothetical contaminant plume. digital.library.unt.edu/ark:/67531/metadc848623/
Lightning, Downed Power Line Form Intriguing Rock Structure in Denton, Texas
This article describes a vitrified soil structure, formed by atmospheric and human activity, possessing characteristics of igneous and metamorphic rocks. digital.library.unt.edu/ark:/67531/metadc848625/
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