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619
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.
Date:
January 18, 2012
Creator:
Young, Monica; Brandt, William Nielsen; Xue, Yongquan; Alexander, David M.; Bauer, Franz E.; Lehmer, Bret et al.
Object Type:
Article
System:
The UNT Digital Library
Vortex Dynamics in Evolutive Flows: A Weakly Chaotic Phenomenon
In this article, the authors make use of a wavelet method to extract, from experimental velocity signals obtained in an evolutive flow, the dominating velocity components generated by vortex dynamics.
Date:
2003
Creator:
Bellazzini, Jacopo; Menconi, Giulia; Ignaccolo, Massimiliano; Buresti, Guido & Grigolini, Paolo
Object Type:
Article
System:
The UNT Digital Library
Waveguide Coupling via Magnetic Gratings with Effective Strips
This article provides an overview of an approach convenient for describing intermediate gratings for two types of applications: both metafilms and the coupling of incident waves to waveguide modes or diffraction orders.
Date:
April 14, 2018
Creator:
Roccapriore, Kevin M.; Lyvers, David P.; Brown, Dean P.; Poutrina, Ekaterina; Urbas, Augustine M.; Germer, Thomas A. et al.
Object Type:
Article
System:
The UNT Digital Library
Weak Emission-Line Quasars in the Context of a Modified Baldwin Effect
This article tests whether the modified Baldwin effect remains strong across the wides possible of ranges of redshift and luminosity.
Date:
May 28, 2015
Creator:
Shemmer, Ohad
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
September 8, 2010
Creator:
Shemmer, Ohad; Trakhtenbrot, Benny; Anderson, Scott F.; Brandt, William Nielsen; Diamond-Stanic, Aleksandar M.; Fan, Xiaohui et al.
Object Type:
Article
System:
The UNT Digital Library
Weakly Aligned Molecules: From Molecular Detectors to Room-Temperature Tunable Masers
Conference proceeding presenting a new mechanism of manipulation of population in molecular rotational levels in a weakly aligned molecules. Originally presented as an invited talk at the 29th International Laser Physics Workshop held July 19-23, 2021.
Date:
July 23, 2021
Creator:
Roy, Colin D.; Branković, Zorica & Rostovtsev, Yuri V.
Object Type:
Article
System:
The UNT Digital Library
Work Function Changes Induced by Charged Adsorbates: Origin of the Polarity Asymmetry
Article discussing work function changes induced by charged adsorbates and the origin of the polarity asymmetry.
Date:
March 28, 2008
Creator:
Bagus, Paul S.; Käfer, Daniel; Witte, Gregor & Wöll, Christof
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
December 9, 2011
Creator:
Wu, Jianfeng; Brandt, William Nielsen; Anderson, Scott F.; Diamond-Stanic, Aleksandar M.; Hall, Patrick B.; Plotkin, Richard M. et al.
Object Type:
Article
System:
The UNT Digital Library
An X-ray fading, UV brightening QSO at z ≈ 6
Article presents quasi-simultaneous X-ray and rest-frame UV observations of quasi-stellar object (QSO) z = 6.025 QSO J1641+3755.
Date:
July 26, 2022
Creator:
Vito, F.; Mignoli, M.; Gilli, R.; Brandt, William Nielsen; Shemmer, Ohad; Bauer, Franz E. et al.
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
February 8, 2009
Creator:
Shemmer, Ohad; Brandt, William Nielsen; Anderson, Scott F.; Diamond-Stanic, Aleksandar M.; Fan, Xiaohui; Richards, Gordon T. et al.
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
May 18, 2007
Creator:
Just, Dennis W.; Brandt, William Nielsen; Shemmer, Ohad; Steffen, Aaron; Schneider, Donald P.; Chartas, George et al.
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
September 12, 2010
Creator:
Wu, Jianfeng; Brandt, William Nielsen; Comins, M.L.; Gibson, Robert R.; Shemmer, Ohad; Garmire, Gordon P. et al.
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
June 12, 2011
Creator:
Saez, Christian; Brandt, William Nielsen; Shemmer, Ohad; Chomiuk, Laura; Lopez, Laura A.; Marshall, Herman L. et al.
Object Type:
Article
System:
The UNT Digital Library
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.
Date:
June 6, 2011
Creator:
Alexander, David M.; Bauer, Franz E.; Brandt, William Nielsen; Daddi, Emanuele; Hickox, Ryan; Lehmer, Bret et al.
Object Type:
Article
System:
The UNT Digital Library
The X-ray Spectral Properties and Variability of Luminous High-Redshift Active Galactic Nuclei
This article contains a detailed investigation of moderate- to high-quality X-ray spectra of 10 of the most luminous active galactic nuclei known at z > 4.
Date:
May 20, 2005
Creator:
Shemmer, Ohad; Brandt, William Nielsen; Vignali, Christian; Schneider, Donald P.; Fan, Xiaohui; Richards, Gordon T. et al.
Object Type:
Article
System:
The UNT Digital Library
X-Ray Unveiling Events in a z ≈ 1.6 Active Galactic Nucleus in the 7 Ms Chandra Deep Field-South
Authors of the article explain that they investigated the extreme X-ray variability of a z = 1.608 active galactic nucleus in the 7 Ms Chandra Deep Field-South (XID 403), which showed two significant X-ray brightening events.
Date:
May 18, 2023
Creator:
Yu, Li-Ming; Luo, Bin; Brandt, William Nielsen; Bauer, Franz E.; De Cicco, D.; Fabian, Andrew C. et al.
Object Type:
Article
System:
The UNT Digital Library
XMM-Newton spectroscopy of the highly polarized and luminous broad absorption line quasar CSO 755
This article presents results from the XMM-Newton observations of the highly optically polarized broad absorption line quasar CSO 755.
Date:
September 4, 2005
Creator:
Shemmer, Ohad; Brandt, William Nielsen; Gallagher, S.C.; Vignali, Christian; Boller, Thomas; Chartas, George et al.
Object Type:
Article
System:
The UNT Digital Library
The XMM-SERVS survey: new XMM–Newton point-source catalogue for the XMM-LSS field
This article presents an X-ray point-source catalogue from the XMM-Large Scale Structure (XMMLSS) survey region, one of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) fields.
Date:
April 25, 2018
Creator:
Chen, C. -T. J.; Brandt, William Nielsen; Luo, Bin; Ranalli, P.; Yang, G.; Alexander, David M. et al.
Object Type:
Article
System:
The UNT Digital Library
Z1 oscillations of the mean charge for isotachic ions in carbon foils
Article discussing Z1 oscillations of the mean charge for isotachic ions in carbon foils.
Date:
April 1995
Creator:
Arrale, A. M.; Jin, Jianyue; Zhao, Z. Y.; Weathers, Duncan L.; McDaniel, Floyd Del. (Floyd Delbert), 1942- & Matteson, Samuel E.
Object Type:
Article
System:
The UNT Digital Library