E. Morganson
A5018086936- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Soil Moisture and Remote Sensing
- Underwater Acoustics Research
- Spectroscopy and Chemometric Analyses
- Scientific Research and Discoveries
- Indoor and Outdoor Localization Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Meteorological Phenomena and Simulations
- Statistical and numerical algorithms
- Astro and Planetary Science
- History and Developments in Astronomy
National Center for Supercomputing Applications
2016-2021
University of Illinois Urbana-Champaign
2016-2020
University of Sussex
2018
Center for Astrophysics Harvard & Smithsonian
2014-2016
Max Planck Institute for Astronomy
2012-2016
Harvard University Press
2013-2015
Trinity House
2013
Max Planck Society
2012
Kavli Institute for Particle Astrophysics and Cosmology
2008-2010
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
We present a tomographic cosmological weak lensing analysis of the HST COSMOS Survey. Applying our lensing-optimized data reduction, principal component interpolation for ACS PSF, and improved modelling charge-transfer inefficiency, we measure signal which is consistent with pure gravitational modes no significant shape systematics. carefully estimate statistical uncertainty from simulated COSMOS-like fields obtained ray-tracing through Millennium Simulation. test pipeline on space-based...
ABSTRACT Luminous quasars at <?CDATA $z\gt 5.6$?> can be studied in detail with the current generation of telescopes and provide us unique information on first gigayear universe. Thus far, these studies have been statistically limited by number known redshifts. Such are rare, therefore, wide-field surveys required to identify them, multiwavelength data separate them efficiently from their main contaminants, far more numerous cool dwarfs. In this paper, we update extend selection for $z\sim...
We describe the Dark Energy Survey (DES) photometric data set assembled from first three years of science operations to support DES Year 3 cosmology analyses, and provide usage notes aimed at broad astrophysics community. Y3 Gold improves on previous releases DES, Y1 Data Release 1 (DES DR1), presenting an expanded curated that incorporates algorithmic developments in image detrending processing, calibration, object classification. comprises nearly 5000 square degrees grizY imaging south...
We report the discovery of a new 'changing-look' quasar, SDSS J101152.98+544206.4, through repeat spectroscopy from Time Domain Spectroscopic Survey. This is an addition to small but growing set quasars whose blue continua and broad optical emission lines have been observed decline by large factor on time-scale approximately decade. The 5100 Å monochromatic continuum luminosity this quasar drops >9.8 in rest-frame time interval <9.7 yr, while Hα 55 same amount time. width line increases dim...
We present a detailed characterization of the 849 broad-line quasars from Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Our quasar sample covers redshift range 0.1<z<4.5 and is flux-limited to i_PSF<21.7 without any other cuts on properties. The main includes: 1) spectral measurements continuum broad emission lines for individual objects coadded first-season spectroscopy in 2014; 2) identification narrow absorption spectra; 3) optical variability properties multi-epoch...
High-redshift quasars are currently the only probes of growth supermassive black holes and potential tracers structure evolution at early cosmic time. Here we present our candidate selection criteria from Panoramic Survey Telescope & Rapid Response System 1 follow-up strategy to discover in redshift range 5.7 ≲ z 6.2. With this discovered eight new ⩽ 6.0 quasars, increasing number known > by more than 10%. We additionally recovered 18 previously quasars. The presented here span a large...
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...
Abstract We perform a systematic search for long-term extreme variability quasars (EVQs) in the overlapping Sloan Digital Sky Survey and 3 Year Dark Energy imaging, which provide light curves spanning more than 15 years. identified ∼1000 EVQs with maximum change g- band magnitude of 1 mag over this period, about 10% all searched. The have L bol ∼ 10 45 –10 47 erg s −1 / Edd 0.01–1. Accounting selection effects, we estimate an intrinsic EVQ fraction ∼30%–50% among baseline ∼15 yr. performed...
We describe catalog-level simulations of Type Ia supernova (SN~Ia) light curves in the Dark Energy Survey Supernova Program (DES-SN), and low-redshift samples from Center for Astrophysics (CfA) Carnegie Project (CSP). These are used to model biases selection effects curve analysis, determine bias corrections SN~Ia distance moduli that measure cosmological parameters. To generate realistic curves, simulation uses a detailed model, incorporates information observations (PSF, sky noise, zero...
Abstract We present griz light curves of 251 SNe Ia from the first 3 years Dark Energy Survey Supernova Program’s (DES-SN) spectroscopically classified sample. The photometric pipeline described in this paper produces calibrated fluxes and associated uncertainties used cosmological parameter analysis by employing a scene modeling approach that simultaneously models variable transient flux temporally constant host galaxy. inject artificial point sources onto DECam images to test accuracy our...
We present results for the first three years of OzDES, a six year programme to obtain redshifts objects in Dark Energy Survey (DES) supernova fields using 2dF fibre positioner and AAOmega spectrograph on Anglo-Australian Telescope. OzDES is multi-object spectroscopic survey targeting multiple types targets at epochs over multiyear baseline one surveys dynamically include transients into target list soon after their discovery. At end years, has spectroscopically confirmed almost 100...
ABSTRACT The uncertain origin of the recently discovered “changing-look” quasar phenomenon—in which a luminous dims significantly to quiescent state in repeat spectroscopy over ∼10-year timescales—may present unexpected challenges our understanding accretion. To better understand this phenomenon, we take first step toward building sample changing-look quasars with systematic but simple archival search for these objects Sloan Digital Sky Survey Data Release 12. By leveraging >10-year...
We report the discovery of two new dwarf galaxies, Lacerta I/Andromeda XXXI (Lac I/And XXXI) and Cassiopeia III/Andromeda XXXII (Cas III/And XXXII), in stacked Pan-STARRS1 r_P1- i_P1-band imaging data. Both are luminous systems (M_V ~ -12) located at projected distances 20.3° 10.5° from M31. Lac I Cas III likely satellites Andromeda galaxy with heliocentric 756^{+44}_{-28} kpc 772^{+61}_{-56} kpc, respectively, corresponding M31-centric 275+/-7 144^{+6}_{-4} . The brightest recent Local...
We study the time lags between continuum emission of quasars at different wavelengths, based on more than four years multi-band ($g$, $r$, $i$, $z$) light-curves in Pan-STARRS Medium Deep Fields. As photons from bands emerge radial ranges accretion disk, constrain sizes disks. select 240 with redshifts $z \approx 1$ or 0.3$ that are relatively line free. The light curves sampled day to month timescales, which makes it possible detect scale crossing With code JAVELIN, we typical several days...
Periodically variable quasars have been suggested as close binary supermassive black holes. We present a systematic search for periodic light curves in 625 spectroscopically confirmed with median redshift of 1.8 4.6 deg$^2$ overlapping region the Dark Energy Survey Supernova (DES-SN) fields and Sloan Digital Sky Stripe 82 (SDSS-S82). Our sample has unique 20-year long multi-color ($griz$) curve enabled by combining DES-SN Y6 observations archival SDSS-S82 data. The deep imaging allows us to...
We measure quasar variability using the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1 or PS1) Sloan Digital Sky (SDSS) establish a method of selecting quasars via their in 10,000 square degree surveys. use 100,000 spectroscopically confirmed that have been well measured both PS1 SDSS take advantage decadal time scales separate measurements measurements. A power law model fits data over entire range tested, 0.01 to 10 years. Variability current PS1-SDSS dataset can...
We present a panoptic view of the stellar structure in Galactic disk's outer reaches commonly known as Monoceros Ring, based on data from Pan-STARRS1. These observations clearly show large extent overdensities both sides disk, extending between b = −25° and +35° covering over 130° longitude. The exhibits complex morphology with stream-like features sharp edge to north south. compare this map mock two published simulations aimed at explaining such structures one postulating an origin tidal...
We present the selection algorithm and anticipated results for Time Domain Spectroscopic Survey (TDSS). TDSS is an Sloan Digital Sky (SDSS)-IV Extended Baryon Oscillation (eBOSS) subproject that will provide initial identification spectra of approximately 220,000 luminosity-variable objects (variable stars active galactic nuclei across 7500 deg2 selected from a combination SDSS multi-epoch Pan-STARRS1 photometry. be largest spectroscopic survey to explicitly target variable objects, avoiding...
Radio-loud Active Galactic Nuclei at z~2-4 are typically located in dense environments and their host galaxies among the most massive systems those redshifts, providing key insights for galaxy evolution. Finding radio-loud quasars highest accessible redshifts (z~6) is important to study properties even earlier cosmic time. They would also serve as background sources radio surveys intended intergalactic medium beyond epoch of reionization HI 21 cm absorption. Currently, only five...
Abstract We present the analysis underpinning measurement of cosmological parameters from 207 spectroscopically classified SNe Ia first 3 years Dark Energy Survey Supernova Program (DES-SN), spanning a redshift range 0.017 < z 0.849. combine DES-SN sample with an external 122 low-redshift ( 0.1) Ia, resulting in “DES-SN3YR” 329 Ia. Our analyses are blinded: after combining our DES-SN3YR distances constraints Cosmic Microwave Background, uncertainties dark energy equation-of-state...
We present the discovery of first high-redshift (z > 5.7) quasar from Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1 or PS1). This was initially detected as an iP1 dropout in PS1, confirmed photometrically with SAO Wide-field InfraRed Camera at Arizona's Multiple Mirror (MMT) Gamma-Ray Burst Optical/Near-Infrared Detector MPG 2.2 m telescope La Silla. The verified spectroscopically MMT Spectrograph, Red Channel Cassegrain Twin Spectrograph Calar Alto 3.5 telescope. Its...
We describe the model for mapping from sky brightness to digital output of Dark Energy Camera (DECam) and algorithms adopted by Survey (DES) inverting this obtain photometric measures celestial objects raw camera output. This calibration aims fluxes that are uniform across field view full angular temporal span DES observations, approaching accuracy limits set shot noise dynamic range observations. The pipeline incorporates several substantive advances over standard detrending techniques,...