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 Department: Physics
 Collection: UNT Scholarly Works
FAUST observations of ultraviolet sources in the directions of NGC 4038-39 and 6752

FAUST observations of ultraviolet sources in the directions of NGC 4038-39 and 6752

Date: December 29, 2000
Creator: Daniels, Julian; Brosch, Noah; Almoznino, Elchanan; Shemmer, Ohad; Bowyer, Stuart & Lampton, Michael
Description: This article discusses an analysis of ultraviolet observations with the FAUST shuttle-borne telescope toward the Antennae and NGC 6752 celestial regions resulting in the detection of 46 and 221 candidate sources respectively, for a signal-to-noise ratio of 8.
Contributing Partner: UNT College of Arts and Sciences
Multiwavelength monitoring of the narrow-line Seyfert 1 galaxy Arakelian 564. II. Ultraviolet continuum and emission-line variability

Multiwavelength monitoring of the narrow-line Seyfert 1 galaxy Arakelian 564. II. Ultraviolet continuum and emission-line variability

Date: July 3, 2001
Creator: Collier, S.; Crenshaw, D.M.; Peterson, Bradley M.; Brandt, William Nielsen; Clavel, J.; Edelson, R. et al.
Description: This article presents the results of an intensive 2 month campaign of approximately daily spectrophotometric monitoring of the narrow-line Seyfert 1 galaxy Ark 564 with the Hubble Space Telescope.
Contributing Partner: UNT College of Arts and Sciences
Reverberation Mapping of High-Luminosity Quasars: First Results

Reverberation Mapping of High-Luminosity Quasars: First Results

Date: December 19, 2006
Creator: Kaspi, Shai; Brandt, William Nielsen; Maoz, Dan; Netzer, Hagai; Schneider, Donald P. & Shemmer, Ohad
Description: This article discusses reverberation mapping of quasars of high luminosity or high redshift.
Contributing Partner: UNT College of Arts and Sciences
Complex optical-X-ray correlations in the narrow-line Seyfert 1 galaxy NGC 4051

Complex optical-X-ray correlations in the narrow-line Seyfert 1 galaxy NGC 4051

Date: May 6, 2003
Creator: Shemmer, Ohad; Uttley, P.; Netzer, Hagai & McHardy, I.M.
Description: This article presents the results of a dense and intensive X-ray and optical monitoring of the narrow-line Seyfert 1 galaxy NGC 4051 carried out in 2000.
Contributing Partner: UNT College of Arts and Sciences
Multiwavelength monitoring of the narrow-line Seyfert 1 galaxy Arakelian 564. III. Optical observations and the optical-UV-X-ray connection

Multiwavelength monitoring of the narrow-line Seyfert 1 galaxy Arakelian 564. III. Optical observations and the optical-UV-X-ray connection

Date: July 3, 2001
Creator: Shemmer, Ohad; Romano, P.; Bertram, Ray; Brinkman, Jon; Collier, S.; Crowley, K.A. et al.
Description: This article presents the results of a 2 year long optical monitoring program of the narrow-line Seyfert 1 galaxy Ark 564.
Contributing Partner: UNT College of Arts and Sciences
Supernova 2002ap: the first month

Supernova 2002ap: the first month

Date: March 27, 2002
Creator: Gal-Yam, Avishay; Ofek, Efran & Shemmer, Ohad
Description: This article reports the results of the first month of an intensive photometric and spectroscopic monitoring campaign of Supernova 2002ap.
Contributing Partner: UNT College of Arts and Sciences
The Spectral Energy Distribution and Emission-Line Properties of the Narrow-Line Seyfert 1 Galaxy Arakelian 564

The Spectral Energy Distribution and Emission-Line Properties of the Narrow-Line Seyfert 1 Galaxy Arakelian 564

Date: November 7, 2003
Creator: Romano, P.; Mathur, S.; Turner, T.J.; Kraemer, S.B.; Crenshaw, D.M.; Peterson, Bradley M. et al.
Description: This article presents the intrinsic spectral energy distribution of the narrow-line Seyfert 1 galaxy Ark 564, constructed with contemporaneous data obtained during a multiwavelength, multisatellite observing campaign in 2000 and 2001.
Contributing Partner: UNT College of Arts and Sciences
Reddening, Emission-Line, and Intrinsic Absorption Properties in the Narrow-Line Seyfert 1 Galaxy Arakelian 564

Reddening, Emission-Line, and Intrinsic Absorption Properties in the Narrow-Line Seyfert 1 Galaxy Arakelian 564

Date: October 12, 2001
Creator: Crenshaw, D.M.; Kraemer, S.B.; Turner, T.J.; Collier, S.; Peterson, Bradley M.; Brandt, William Nielsen et al.
Description: This article uses Hubble Space Telescope UV and optical spectra of the narrow-line Seyfert 1 galaxy Ark 564 to investigate its internal reddening and properties of its emission-line and intrinsic UV absorption gas.
Contributing Partner: UNT College of Arts and Sciences
Periodic microvariation of B416, a new luminous blue variable in M33

Periodic microvariation of B416, a new luminous blue variable in M33

Date: September 2, 1999
Creator: Shemmer, Ohad; Leibowitz, E.M. & Szkody, Paula
Description: This article reports optical photometric and spectroscopic observations of the M33 star B416, establishing it as the fifth identified luminous blue variable (LBV) in that galaxy.
Contributing Partner: UNT College of Arts and Sciences
Is There a Metallicity-Luminosity Relationship in Active Galactic Nuclei? The Case of Narrow-Line Seyfert 1 Galaxies

Is There a Metallicity-Luminosity Relationship in Active Galactic Nuclei? The Case of Narrow-Line Seyfert 1 Galaxies

Date: February 8, 2002
Creator: Shemmer, Ohad & Netzer, Hagai
Description: This article discusses the relationship between metallicity and luminosity in active galactic nuclei by introducing new metallicity measurements for a sample of narrow-line Seyfert 1 galaxies.
Contributing Partner: UNT College of Arts and Sciences
The Hard X-Ray Spectral Slope as an Accretion Rate Indicator in Radio-Quiet Active Galactic Nuclei

The Hard X-Ray Spectral Slope as an Accretion Rate Indicator in Radio-Quiet Active Galactic Nuclei

Date: June 14, 2006
Creator: Shemmer, Ohad; Brandt, William Nielsen; Netzer, Hagai; Maiolino, Roberto & Kaspi, Shai
Description: This article presents XMM-Newton observations of two luminous and high accretion rate radio-quiet active galactic nuclei at z ~ 2.
Contributing Partner: UNT College of Arts and Sciences
Erratum: "Is there a metallicity-luminosity relationship in active galactic nuclei? The case of narrow-line Seyfert 1 galaxies"

Erratum: "Is there a metallicity-luminosity relationship in active galactic nuclei? The case of narrow-line Seyfert 1 galaxies"

Date: April 10, 2002
Creator: Shemmer, Ohad & Netzer, Hagai
Description: This erratum corrects a computational error affecting the calculation of the intrinsic luminosities of several objects in the article "Is there a metallicity-luminosity relationship in active galactic nuclei? The case of narrow-line Seyfert 1 galaxies." This does not affect any of the main results of the article.
Contributing Partner: UNT College of Arts and Sciences
Binary Microlensing Events from the MACHO Project

Binary Microlensing Events from the MACHO Project

Date: March 27, 2000
Creator: Alcock, C.; Allsman, R.A.; Alves, D.; Axelrod, T.S.; Baines, D.; Becker, A.C. et al.
Description: This article presents the light curves of 21 gravitational microlensing events from the first six years of the MACHO Project gravitational microlensing survey that are likely examples of lensing by binary systems.
Contributing Partner: UNT College of Arts and Sciences
Nova Sagittarii 1998 (V4633 Sgr): a permanent superhump system or an asynchronous polar?

Nova Sagittarii 1998 (V4633 Sgr): a permanent superhump system or an asynchronous polar?

Date: August 23, 2001
Creator: Lipkin, Yaacov; Leibowitz, E.M.; Retter, A. & Shemmer, Ohad
Description: This article reports the results of observations of V4633 Sgr (Nova Sagittarii 1998) during 1998-2000.
Contributing Partner: UNT College of Arts and Sciences
Near-Infrared Spectroscopy of High-Redshift Active Galactic Nuclei. I. A Metallicity-Accretion Rate Relationship

Near-Infrared Spectroscopy of High-Redshift Active Galactic Nuclei. I. A Metallicity-Accretion Rate Relationship

Date: June 22, 2004
Creator: Shemmer, Ohad; Netzer, Hagai; Maiolino, Roberto; Oliva, Ernesto; Croom, Scott; Corbett, E. et al.
Description: This article presents near-infrared spectroscopic measurements of the Hβ region for a sample of 29 luminous high-redshift quasars.
Contributing Partner: UNT College of Arts and Sciences
Near-Infrared Spectroscopy of High-Redshift Active Galactic Nuclei. II. Disappearing Narrow-Line Regions and the Role of Accretion

Near-Infrared Spectroscopy of High-Redshift Active Galactic Nuclei. II. Disappearing Narrow-Line Regions and the Role of Accretion

Date: June 22, 2004
Creator: Shemmer, Ohad; Netzer, Hagai; Maiolino, Roberto; Oliva, Ernesto; Croom, Scott; Corbett, E. et al.
Description: This article presents near-infrared spectroscopic measurements of the Hβ region for a sample of 29 luminous high-redshift quasars, and uses the data to discuss the size and other properties of the narrow-line regions in those sources.
Contributing Partner: UNT College of Arts and Sciences
The X-ray Spectral Properties and Variability of Luminous High-Redshift Active Galactic Nuclei

The X-ray Spectral Properties and Variability of Luminous High-Redshift Active Galactic Nuclei

Date: May 20, 2005
Creator: Shemmer, Ohad; Brandt, William Nielsen; Vignali, Christian; Schneider, Donald P.; Fan, Xiaohui; Richards, Gordon T. et al.
Description: 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.
Contributing Partner: UNT College of Arts and Sciences
Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey

Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey

Date: February 17, 2006
Creator: Shemmer, Ohad; Brandt, William Nielsen; Schneider, Donald P.; Fan, Xiaohui; Strauss, Michael A.; Diamond-Stanic, Aleksandar M. et al.
Description: This article presents Chandra observations of 21 z > 4 quasars, including 11 sources at z > 5.
Contributing Partner: UNT College of Arts and Sciences
XMM-Newton spectroscopy of the highly polarized and luminous broad absorption line quasar CSO 755

XMM-Newton spectroscopy of the highly polarized and luminous broad absorption line quasar CSO 755

Date: September 4, 2005
Creator: Shemmer, Ohad; Brandt, William Nielsen; Gallagher, S.C.; Vignali, Christian; Boller, TH.; Chartas, George et al.
Description: This article presents results from the XMM-Newton observations of the highly optically polarized broad absorption line quasar CSO 755.
Contributing Partner: UNT College of Arts and Sciences
The Discovery of a Nearby M Dwarf

The Discovery of a Nearby M Dwarf

Date: April 1999
Creator: Shemmer, Ohad & Kaspi, Shai
Description: This article reports the serendipitous discovery of a nearby M dwarf star, found while observing the old nova DN Gem at the Wise Observatory.
Contributing Partner: UNT College of Arts and Sciences
Massive Stars Exploding in a He-Rich Circumstellar Medium -- I. Type Ibn (SN 2006jc-Like) Events

Massive Stars Exploding in a He-Rich Circumstellar Medium -- I. Type Ibn (SN 2006jc-Like) Events

Date: June 15, 2008
Creator: Pastorello, Andrea; Mattila, Seppo; Zampieri, Luca; Della Valle, Massimo; Smartt, Stephen J.; Valenti, Stefano et al.
Description: This article presents new spectroscopic and photometric data of the Type Ibn supernovae 2006jc, 2000er and 2002ao.
Contributing Partner: UNT College of Arts and Sciences
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

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

Date: April 2, 2014
Creator: Dhoubhadel, Mangal; Rout, Bibhudutta; Lakshantha, Wickramaarachchige J.; Das, Sushanta K.; D'Souza, Francis; Glass, Gary A. et al.
Description: 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.
Contributing Partner: UNT College of Arts and Sciences
Optically Selected BL Lacertae Candidates from the Sloan Digital Sky Survey Data Release Seven

Optically Selected BL Lacertae Candidates from the Sloan Digital Sky Survey Data Release Seven

Date: October 30, 2009
Creator: Plotkin, Richard M.; Anderson, Scott F.; Brandt, William Nielsen; Diamond-Stanic, Aleksandar M.; Fan, Xiaohui; Hall, Patrick B. et al.
Description: This article presents a sample of 723 optically selected BL Lac candidates from the Sloan Digital Sky Survey Data Release 7 spectroscopic database.
Contributing Partner: UNT College of Arts and Sciences
A Population of X-Ray Weak Quasars: PHL 1811 Analogs at High Redshift

A Population of X-Ray Weak Quasars: PHL 1811 Analogs at High Redshift

Date: April 15, 2011
Creator: Wu, Jianfeng; Brandt, William Nielsen; Hall, Patrick B.; Gibson, Robert R.; Richards, Gordon T.; Schneider, Donald P. et al.
Description: 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.
Contributing Partner: UNT College of Arts and Sciences
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