D. A. Goldstein
A5009500371- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Calibration and Measurement Techniques
- Protein Tyrosine Phosphatases
- Optical Systems and Laser Technology
- History and Developments in Astronomy
- Particle accelerators and beam dynamics
- Spectroscopy and Laser Applications
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
California Institute of Technology
2018-2022
Lawrence Berkeley National Laboratory
2015-2021
University of California, Berkeley
2015-2019
National Center for Supercomputing Applications
2016-2018
California University of Pennsylvania
2018
University of Nottingham
2018
University of Surrey
2016
Barcelona Institute for Science and Technology
2016
University of California, Irvine
2006
Georgetown University Medical Center
1999
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we an overview organization project summarize features in package, recent major release, version 2.0. We then describe infrastructure designed facilitate support a broader ecosystem...
The Zwicky Transient Facility (ZTF) is a new optical time-domain survey that uses the Palomar 48 inch Schmidt telescope. A custom-built wide-field camera provides 47 deg2 field of view and 8 s readout time, yielding more than an order magnitude improvement in speed relative to its predecessor survey, Factory. We describe design implementation observing system. ZTF data system at Infrared Processing Analysis Center near-real-time reduction identify moving varying objects. outline analysis...
We present cosmological results from a combined analysis of galaxy clustering and weak gravitational lensing, using 1321 deg$^2$ $griz$ imaging data the first year Dark Energy Survey (DES Y1). combine three two-point functions: (i) cosmic shear correlation function 26 million source galaxies in four redshift bins, (ii) angular autocorrelation 650,000 luminous red five (iii) galaxy-shear cross-correlation positions shears. To demonstrate robustness these results, we use independent pairs...
The Zwicky Transient Facility (ZTF), a public-private enterprise, is new time domain survey employing dedicated camera on the Palomar 48-inch Schmidt telescope with 47 deg$^2$ field of view and 8 second readout time. It well positioned in development astronomy, offering operations at 10% scale style Large Synoptic Survey Telescope (LSST) single 1-m class telescope. public surveys will cover observable northern sky every three nights g r filters visible Galactic plane night r. Alerts...
Abstract We describe the first public data release of Dark Energy Survey, DES DR1, consisting reduced single-epoch images, co-added source catalogs, and associated products services assembled over 3 yr science operations. DR1 is based on optical/near-infrared imaging from 345 distinct nights (2013 August to 2016 February) by Camera mounted 4 m Blanco telescope at Cerro Tololo Inter-American Observatory in Chile. wide-area survey covering ∼5000 deg 2 southern Galactic cap five broad...
We use 26×106 galaxies from the Dark Energy Survey (DES) Year 1 shape catalogs over 1321 deg2 of sky to produce most significant measurement cosmic shear in a galaxy survey date. constrain cosmological parameters both flat ΛCDM and wCDM models, while also varying neutrino mass density. These results are shown be robust using two independent catalogs, photo-z calibration methods, analysis pipelines blind analysis. find 3.5% fractional uncertainty on σ8(Ωm/0.3)0.5=0.782+0.027−0.027 at 68%...
ABSTRACT We search for excess γ -ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years data from Fermi Large Area Telescope (LAT). Our sample 45 stellar systems includes 28 kinematically dark-matter-dominated dwarf spheroidal (dSphs) 17 recently discovered that have photometric characteristics consistent population known dSphs. For each these targets, relative predicted flux due to dark matter annihilation is taken kinematic...
ABSTRACT We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large surveys. The updated algorithm is applied of Science Verification (SV) data from Dark Energy Survey (DES), and Sloan Digital Sky (SDSS) DR8 set. DES SV catalog locally volume limited contains 786 clusters with richness (roughly equivalent ) . consists 26,311 , sharply increasing threshold as function redshift performance both catalogs shown be excellent,...
We describe the derivation and validation of redshift distribution estimates their uncertainties for populations galaxies used as weak-lensing sources in Dark Energy Survey (DES) Year 1 cosmological analyses. The Bayesian Photometric Redshift (bpz) code is to assign four bins between z ≈ 0.2 ≈1.3, produce initial lensing-weighted distributions |$n^i_{\rm PZ}(z)\propto \mathrm{d}n^i/\mathrm{d}z$| members bin i. Accurate determination parameters depends critically on knowledge ni, but...
Abstract We present Magellan /IMACS spectroscopy of the recently discovered Milky Way satellite Eridanus II (Eri II). identify 28 member stars in Eri II, from which we measure a systemic radial velocity and dispersion . Assuming that is dispersion-supported system dynamical equilibrium, derive mass within half-light radius , indicating mass-to-light ratio / confirming it dark matter-dominated dwarf galaxy. From equivalent width measurements Ca triplet lines 16 red giant stars, mean...
Shear peak statistics has gained a lot of attention recently as practical alternative to the two point for constraining cosmological parameters. We perform shear analysis Dark Energy Survey (DES) Science Verification (SV) data, using weak gravitational lensing measurements from 139 deg$^2$ field. measure abundance peaks identified in aperture mass maps, function their signal-to-noise ratio, range $0<\mathcal S / \mathcal N<4$. To predict counts parameters we use suite $N$-body simulations...
We describe an algorithm for identifying point-source transients and moving objects on reference-subtracted optical images containing artifacts of processing instrumentation. The makes use the supervised machine learning technique known as Random Forest. present results from its in Dark Energy Survey Supernova program (DES-SN), where it was trained using a sample 898,963 signal background events generated by transient detection pipeline. After reprocessing data collected during first DES-SN...
We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample 207 spectroscopically confirmed SNe three years DES-SN, combined with low-redshift sample 122 literature. Our "DES-SN3YR" result these 329 is based on series companion analyses and improvements covering SN discovery, spectroscopic selection, photometry, calibration, distance bias corrections, evaluation...
The Dark Energy Survey (DES) is a five-year optical imaging campaign with the goal of understanding origin cosmic acceleration. DES performs 5000 square degree survey southern sky in five bands (g,r,i,z,Y) to depth ~24th magnitude. Contemporaneously, deep, time-domain four (g,r,i,z) over 27 degrees. exposures are processed nightly an evolving data reduction pipeline and evaluated for image quality determine if they need be retaken. Difference transient source detection also performed time...
We present the discovery and spectroscopic confirmation with European Southern Observatory New Technology Telescope (NTT) Gemini South telescopes of eight new, rediscovery two previously known, 6.0 < z 6.5 quasars zAB 21.0. These were photometrically selected without any morphological criteria from 1533 deg2 using spectral energy distribution (SED) model fitting to photometric data Dark Energy Survey (g, r, i, z, Y), VISTA Hemisphere (J, H, K) Wide-field Infrared Explorer (W1, W2). The...
The Large Synoptic Survey Telescope (LSST) Dark Energy Science Collaboration (DESC) will use five cosmological probes: galaxy clusters, large scale structure, supernovae, strong lensing, and weak lensing. This Requirements Document (SRD) quantifies the expected dark energy constraining power of these probes individually together, with conservative assumptions about analysis methodology follow-up observational resources based on our current understanding evolution within field in coming...
Abstract We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite Tucana III (Tuc III). identify 26 member stars in Tuc from which we measure a mean radial velocity v hel = −102.3 ± 0.4 (stat.) 2.0 (sys.) , dispersion and metallicity . The upper limit on is σ < 1.5 at 95.5% confidence, corresponding mass within half-light radius 9.0 × 10 4 M ⊙ cannot rule out mass-to-light ratios as large 240 / L for III, but much lower that would leave system baryon-dominated...
We present galaxy-galaxy lensing measurements from 1321 sq. deg. of the Dark Energy Survey (DES) Year 1 (Y1) data. The lens sample consists a selection 660,000 red galaxies with high-precision photometric redshifts, known as redMaGiC, split into five tomographic bins in redshift range 0.15<z<0.9. use two different source samples, obtained Metacalibration (26 million galaxies) and im3shape (18 shear estimation codes, which are four 0.2<z<1.3. perform extensive testing potential systematic...
We present time-delay measurements for the new quadruply imaged quasar DES J0408-5354, first found in Dark Energy Survey (DES). Our result is made possible by implementing a observational strategy using almost daily observations with MPIA 2.2m telescope at La Silla observatory and deep exposures reaching signal-to-noise ratio of about 1000 per image. This data quality allows us to catch small photometric variations (a few mmag rms) quasar, acting on temporal scales much shorter than...
We describe the operation and performance of difference imaging pipeline (DiffImg) used to detect transients in deep images from Dark Energy Survey Supernova program (DES-SN) its first observing season 2013 August through 2014 February. DES-SN is a search for which ten 3 deg2 fields are repeatedly observed g, r, i, z passbands with cadence about 1 week. The strategy has been optimized measure high-quality light curves redshifts thousands Type Ia supernovae (SNe Ia) goal measuring dark energy...
Early-time observations of Type Ia supernovae (SNe Ia) are essential to constrain their progenitor properties. In this paper, we present high-quality light curves 127 SNe discovered by the Zwicky Transient Facility (ZTF) in 2018. We describe our method perform forced point spread function (PSF) photometry, which can be applied other types extragalactic transients. With a planned cadence six per night ($3g+3r$), all detected both $g$ and $r$ band more than 10\,d (in rest frame) prior epoch...
We present DES14X3taz, a new hydrogen-poor super luminous supernova (SLSN-I) discovered by the Dark Energy Survey (DES) program, with additional photometric data provided Using DECam for Superluminous Supernovae (SUDSS). Spectra obtained using OSIRIS on Gran Telescopio CANARIAS (GTC) show DES14X3taz is SLSN-I at z=0.608. Multi-color photometry reveals double-peaked light curve: blue and relatively bright initial peak that fades rapidly prior to slower rise of main curve. Our multi-color...
On 2019 August 14, the Advanced LIGO and Virgo interferometers detected high-significance gravitational wave (GW) signal S190814bv. The GW data indicated that event resulted from a neutron star--black hole (NSBH) merger, or potentially low-mass binary black merger. Due to low false alarm rate precise localization (23 deg$^2$ at 90\%), S190814bv presented community with best opportunity yet directly observe an optical/near-infrared counterpart NSBH To search for potential counterparts, GROWTH...
We search Dark Energy Survey (DES) Year 3 imaging data for galaxy-galaxy strong gravitational lenses using convolutional neural networks. generate 250,000 simulated at redshifts > 0.8 from which we create a set training the networks with realistic seeing, sky and shot noise. Using simulations as guide, build catalogue of 1.1 million DES sources 1.8 < g - i 5, 0.6 -r 3, r_mag 19, g_mag 20 i_mag 18.2. train two ensembles on sets consisting lenses, non-lenses, real sources. use to score images...