W. N. Brandt
A5015491870- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Calibration and Measurement Techniques
- Particle Detector Development and Performance
- Mechanics and Biomechanics Studies
- Particle Accelerators and Free-Electron Lasers
- Scientific Measurement and Uncertainty Evaluation
- Relativity and Gravitational Theory
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Black Holes and Theoretical Physics
- Nuclear Physics and Applications
Pennsylvania State University
2015-2024
Louisiana State University Health Sciences Center Shreveport
2024
Louisiana State University Health Sciences Center New Orleans
2024
Space Science Institute
2024
Netherlands Institute for Radio Astronomy
2024
Pontificia Universidad Católica de Chile
2023
Max Planck Society
2015-2019
Max Planck Institute for Astronomy
2019
University of Southampton
2017
Tsinghua University
2016
Building on the legacy of Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program four spectroscopic surveys three scientific themes: dark energy cosmological parameters, history structure Milky Way, population giant planets around other stars. In keeping with SDSS tradition, will provide regular public releases all its data, beginning Data Release 8 (DR8), which was made in 2011 January includes SDSS-I SDSS-II images spectra reprocessed latest pipelines calibrations produced for...
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
This special issue of the Astrophysical Journal Letters is dedicated to presenting initial results from Great Observatories Origins Deep Survey (GOODS) that are primarily, but not exclusively, based on multiband imaging data obtained with Hubble Space Telescope and Advanced Camera for Surveys (ACS). The survey covers roughly 320 arcmin2 in ACS F435W, F606W, F814W, F850LP bands, divided into two well-studied fields. Existing deep observations Chandra X-Ray Observatory ground-based facilities...
The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using original SDSS wide-field imager, and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution novel interferometer. All SDSS-III are now made public. In particular, this paper describes Data Release 11 (DR11) including all acquired through 2013 July, 12 (DR12) adding July (including included in previous releases), marking end observing. Relative our public...
Aims.We study the relationship between local environment of galaxies and their star formation rate (SFR) in Great Observatories Origins Deep Survey, GOODS, at .
Abstract We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands Milky Way stars at high resolution and signal-to-noise ratios in near-infrared. Mapping Nearby Galaxies (MaNGA) survey obtaining spatially resolved spectroscopy for nearby galaxies (median <?CDATA $z\sim 0.03$?> ). extended Baryon Oscillation Spectroscopic (eBOSS)...
ABSTRACT The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from Baryon Oscillation Spectroscopic (BOSS). This ninth release (DR9) of SDSS project includes 535,995 new galaxy spectra (median z ∼ 0.52), 102,100 quasar 2.32), and 90,897 stellar spectra, along with presented in previous releases. These were obtained BOSS spectrograph taken between 2009 December 2011 July. In addition, parameters pipeline, which determines radial velocities, surface temperatures,...
The Sloan Digital Sky Survey (SDSS) started a new phase in August 2008, with instrumentation and surveys focused on Galactic structure chemical evolution, measurements of the baryon oscillation feature clustering galaxies quasar Ly alpha forest, radial velocity search for planets around ~8000 stars. This paper describes first data release SDSS-III (and eighth counting from beginning SDSS). includes five-band imaging roughly 5200 deg^2 Southern Cap, bringing total footprint SDSS to 14,555...
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in clustering matter over a larger volume than combined efforts all previous spectroscopic surveys large-scale structure. BOSS uses 1.5 million luminous galaxies as faint i = 19.9 10,000 deg2 BAO redshifts z < 0.7. Observations neutral hydrogen Lyα forest more 150,000 quasar spectra (g 22) will constrain redshift range 2.15 3.5. Early results from include first detection...
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of exciting science opportunities next decade. The Large Synoptic Survey Telescope (LSST) have an effective aperture 6.7 meters and imaging camera field view 9.6 deg^2, be devoted ten-year 20,000 deg^2 south +15 deg. Each pointing imaged 2000 times fifteen second exposures six broad from 0.35 1.1 microns, total point-source depth r~27.5. LSST Science Book describes basic...
We present the fifth edition of Sloan Digital Sky Survey (SDSS) Quasar Catalog, which is based upon SDSS Seventh Data Release. The catalog, contains 105,783 spectroscopically confirmed quasars, represents conclusion SDSS-I and SDSS-II quasar survey. catalog consists objects that have luminosities larger than M_i = -22.0 (in a cosmology with H_0 70 km/s/Mpc Omega_M 0.3, Omega_Lambda 0.7) at least one emission line FWHM 1000 km/s or interesting/complex absorption features, are fainter i > 15.0...
The Sloan Digital Sky Survey (SDSS) has been in operation since 2000 April. This paper presents the Tenth Public Data Release (DR10) from its current incarnation, SDSS-III. data release includes first spectroscopic Apache Point Observatory Galaxy Evolution Experiment (APOGEE), along with Baryon Oscillation Spectroscopic (BOSS) taken through 2012 July. APOGEE instrument is a near-infrared R ∼ 22,500 300 fiber spectrograph covering 1.514–1.696 μm. survey studying chemical abundances and radial...
This paper documents the seventeenth data release (DR17) from Sloan Digital Sky Surveys; fifth and final fourth phase (SDSS-IV). DR17 contains complete of Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal surveying over 10,000 nearby galaxies. The MaNGA Stellar Library (MaStar) accompanies this data, providing observations almost 30,000 stars through instrument during bright time. also Galactic Evolution Experiment 2 (APOGEE-2) survey publicly...
We present catalogs for the ~2 Ms Chandra Deep Field-North, currently deepest X-ray observation of Universe in 0.5-8.0 keV band. Five hundred and three (503) sources are detected over an ~448 sq.arcmin area up to seven bands; 20 these lie Hubble Field-North. Source positions determined using matched-filter centroiding techniques; median positional uncertainty is ~0.3 arcsecs. The colors indicate a broad variety source types, although absorbed AGNs (including some possible Compton-thick...
We present the discovery of three new quasars at z > 6 in ∼ 1300 deg2 Sloan Digital Sky Survey imaging data, J114816.64+525150.3 (z = 6.43), J104845.05+463718.3 6.23), and J163033.90+401209.6 6.05). The first two objects have weak Lyα emission lines; their redshifts are determined from positions Lyman break. They only accurate to ∼0.05 could be affected by presence broad absorption line systems. last object has a strength more typical lower redshift quasars. Based on sample six 5.7 that...
We report the results of first-epoch observation with ACIS-I instrument on Chandra X-Ray Observatory Sagittarius A* (Sgr A*), compact radio source associated supermassive black hole (SMBH) at dynamical center Milky Way. This produced first X-ray (0.5-7 keV) spectroscopic image arcsecond resolution central 17′ × (40 pc 40 pc) Galaxy. discovery an source, CXOGC J174540.0-290027, coincident Sgr within 0.″27 ± 0.″18. The probability a false match is estimated to be ≲0.5%. spectrum well fitted...
The Very Large Array Sky Survey (VLASS) is a synoptic, all-sky radio sky survey with unique combination of high angular resolution ($\approx$2.5"), sensitivity (a 1$\sigma$ goal 70 $\mu$Jy/beam in the coadded data), full linear Stokes polarimetry, time domain coverage, and wide bandwidth (2-4 GHz). first observations began September 2017, observing for will finish 2024. VLASS use approximately 5500 hours on Karl G. Jansky (VLA) to cover whole visible VLA (Declination $>-40^{\circ}$), total...
We present partial-correlation analyses that examine the strengths of relationships between l2500 Å, l2 keV, αOX, and redshift for optically selected active galactic nuclei (AGNs). extend work Strateva coworkers, which analyzed AGNs from Sloan Digital Sky Survey (SDSS), by including 52 moderate-luminosity, COMBO-17 survey with corresponding deep (≈250 ks to 1 Ms) X-ray observations Extended Chandra Deep Field-South. The extends ∼3 mag deeper than SDSS probes moderate-luminosity numerically...
We present X-ray source catalogs for the $\approx7$ Ms exposure of Chandra Deep Field-South (CDF-S), which covers a total area 484.2 arcmin$^2$. Utilizing WAVDETECT initial detection and ACIS Extract photometric extraction significance assessment, we create main catalog containing 1008 sources that are detected in up to three bands: 0.5-7.0 keV, 0.5-2.0 2-7 keV. A supplementary is also provided including 47 lower-significance have bright ($K_s\le23$) near-infrared counterparts. identify...
We present the discovery of seven quasars at z > 5.7, selected from ∼2000 deg2 multicolor imaging data Sloan Digital Sky Survey. The new have redshifts 5.79 to 6.13. Five are as part a complete flux-limited sample in SDSS northern Galactic cap; two larger photometric errors and not sample. One quasars, J1335+3533 (z = 5.93), exhibits no emission lines; 3 σ limit on rest-frame equivalent width Lyα+N V line is 5 Å. It highest redshift lineless quasar known could be gravitational lensed galaxy,...
We present the fourth edition of Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase over 30,000 entries since previous edition. consists objects in SDSS Fifth Data Release that have luminosities larger than Mi = -22.0 (in a cosmology with H0 70 km s-1 Mpc-1, ΩM 0.3, and ΩΛ 0.7), at least one emission line FWHM 1000 or interesting/complex absorption features, are fainter i ≈ 15.0, highly reliable redshifts. area covered by ≈5740 deg2....
The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct novel cosmological observations using the BOSS spectrograph at Apache Point Observatory. Observations be simultaneous with Time Domain (TDSS) designed for variability studies and Identification of eROSITA Sources (SPIDERS) program X-ray sources. eBOSS use four different tracers to measure distance-redshift relation baryon acoustic oscillations (BAO). Using more than 250,000 new, spectroscopically confirmed luminous red...
▪ Abstract Deep surveys of the cosmic X-ray background are reviewed in context observational progress enabled by Chandra X-Ray Observatory and Multi-Mirror Mission-Newton. The sources found deep described along with their redshift luminosity distributions, effectiveness such at selecting active galactic nuclei (AGN) is assessed. Some key results from highlighted, including (a) measurements AGN evolution growth supermassive black holes, (b) constraints on demography physics high-redshift AGN,...