Edward F. Schlafly
A5062856015- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Infrared Target Detection Methodologies
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Space Exploration and Technology
- Dark Matter and Cosmic Phenomena
- Remote Sensing in Agriculture
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Medical Imaging Techniques and Applications
- Statistical and numerical algorithms
Space Telescope Science Institute
2022-2025
Lawrence Livermore National Laboratory
2020-2024
Michigan Science Center
2023
Lawrence Berkeley National Laboratory
2016-2021
Kitt Peak National Observatory
2020
Max Planck Institute for Astronomy
2013-2018
Berkeley College
2016
University of California, Berkeley
2016
Max Planck Society
2014
Center for Astrophysics Harvard & Smithsonian
2012-2013
We present measurements of dust reddening using the colors stars with spectra in Sloan Digital Sky Survey. measure as difference between measured and predicted a star, derived from stellar parameters Extension for Galactic Understanding Exploration Stellar Parameter Pipeline. achieve uncertainties 56, 34, 25, 29 mmag u − g, g r, r i, i z, per though uncertainty varies depending on type magnitude star. The spectrum-based confirm our earlier "blue tip" measurements, finding coefficients...
We present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. detail improvements to PS1 SN photometry, astrometry calibration that reduce systematic uncertainties in distances. combine subset of 279 ($0.03 < z 0.68$) with useful distance estimates from SDSS, SNLS, various low-z HST samples form largest combined sample consisting a total 1048 ranging $0.01 2.3$, which we...
Abstract The DESI Legacy Imaging Surveys ( http://legacysurvey.org/ ) are a combination of three public projects (the Dark Energy Camera Survey, the Beijing–Arizona Sky and Mayall z -band Survey) that will jointly image ≈14,000 deg 2 extragalactic sky visible from northern hemisphere in optical bands g , r using telescopes at Kitt Peak National Observatory Cerro Tololo Inter-American Observatory. combined survey footprint is split into two contiguous areas by Galactic plane. imaging...
Abstract We present a new three-dimensional map of dust reddening, based on Gaia parallaxes and stellar photometry from Pan-STARRS 1 2MASS. This covers the sky north decl. −30°, out to distance few kiloparsecs. contains three major improvements over our previous work. First, inclusion dramatically improves estimates nearby stars. Second, we incorporate spatial prior that correlates density across sightlines. produces smoother map, with more isotropic clouds smaller uncertainties,...
We present a three-dimensional map of interstellar dust reddening, covering three-quarters the sky out to distance several kiloparsecs, based on Pan-STARRS 1 (PS1) and 2MASS photometry. The reveals wealth detailed structure, from filaments large cloud complexes. has hybrid angular resolution, with most at an resolution –, maximum . distribution is determined in fully probabilistic framework, yielding uncertainty reddening along each line sight, as well stellar distances, reddenings,...
We present a new 3D map of interstellar dust reddening, covering three quarters the sky (declinations δ ≳ −30°) out to distance several kiloparsecs. The is based on high-quality stellar photometry 800 million stars from Pan-STARRS 1 and 2MASS. divide into sightlines containing few hundred each, then infer distances types, along with line-of-sight distribution. Our incorporates more accurate average extinction law an additional 1.5 yr data, tracing greater extinctions at higher angular...
We present a precise photometric calibration of the first 1.5 years science imaging from Pan-STARRS1 survey (PS1), an ongoing optical entire sky north declination −30° in five bands. Building on techniques employed by Padmanabhan et al. Sloan Digital Sky Survey (SDSS), we use repeat PS1 observations stars to perform relative each its bands, simultaneously solving for system throughput, atmospheric transparency, and large-scale detector flat field. Both internal consistency tests comparison...
As of 2012 January 21, the Pan-STARRS 1 3π Survey has observed 3/4 sky visible from Hawaii with a minimum 2 and mean 7.6 observations in five filters, gP1, rP1, iP1, zP1, yP1. Now at end second year mission, we are position to make an initial public release portion this unprecedented data set. This article describes PS1 Photometric Ladder, Release 12.01. is first series releases be generated as survey coverage increases analysis improves. The Ladder rungs every hour right ascension four...
Abstract Quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they unique probes of the early universe. To date, only a few quasars have been reported at <?CDATA $z\gt 6.5$?> (<800 Myr after big bang). In this work, we present six additional $z\gtrsim discovered using Pan-STARRS1 survey. We use sample 15 perform homogeneous and comprehensive analysis highest-redshift quasar population. report four main results: (1) majority show large blueshifts broad...
We present the details of photometric and astrometric calibration Pan-STARRS1 $3\pi$ Survey. The goals were to reduce systematic effects introduced by camera detectors, place all observations onto a system with consistent zero points over entire area surveyed, ~30,000 square degrees north $\delta$ = -30 degrees. compensates for similar so that positions, proper motions, parallaxes are reliable as well. Pan-STARRS Data Release 2 (DR2) astrometry is tied Gaia DR1 release.
We present griz light curves of 146 spectroscopically confirmed Type Ia Supernovae ($0.03 < z <0.65$) discovered during the first 1.5 years Pan-STARRS1 Medium Deep Survey. The natural photometric system is determined by a combination on-site measurements instrument response function and observations spectrophotometric standard stars. find that systematic uncertainties in are currently 1.2\% without accounting for uncertainty HST Calspec definition AB system. A Hubble diagram constructed with...
ABSTRACT The dust extinction curve is a critical component of many observational programs and an important diagnostic the physics interstellar medium. Here we present new measurements its variation toward tens thousands stars, hundred-fold larger sample than in existing detailed studies. We use data from APOGEE spectroscopic survey combination with ten-band photometry Pan-STARRS1, Two Micron All-Sky Survey, Wide-field Infrared Survey Explorer . find that optical through infrared well...
Abstract We present a uniform catalog of accurate distances to local molecular clouds informed by the Gaia DR2 data release. Our methodology builds on that Schlafly et al. First, we infer distance and extinction stars along sightlines toward using optical near-infrared photometry. When available, incorporate knowledge stellar obtained from parallax measurements. model these per-star distance–extinction estimates as being caused dust screen with 2D morphology derived Planck at an unknown...
We present the discovery of three new Milky Way satellites from our search for compact stellar overdensities in photometric catalog Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS 1, or PS1) 3pi survey. The first satellite, Laevens 3, is located at a heliocentric distance d=67+/-3 kpc. With total magnitude Mv=-4.4+/-0.3 half-light radius rh=7+/-2 pc, its properties resemble those outer halo globular clusters. second system, Draco II/Laevens 4 (Dra II), closer fainter...
The spatial structure of stellar populations with different chemical abundances in the Milky Way contains a wealth information on Galactic evolution over cosmic time. We use data 14,699 red-clump stars from APOGEE survey, covering 4 kpc <~ R 15 kpc, to determine mono-abundance (MAPs)---stars narrow bins [a/Fe] and [Fe/H]---accounting for complex effects selection function spatially-variable dust obscuration. that all MAPs enhanced are centrally concentrated well-described as exponentials...
The CatWISE2020 Catalog consists of 1,890,715,640 sources over the entire sky selected from WISE and NEOWISE survey data at 3.4 4.6 $\mu$m (W1 W2) collected 2010 Jan. 7 to 2018 Dec. 13. This dataset adds two years that used for CatWISE Preliminary (Eisenhardt et al., 2020), bringing total six times as many exposures spanning sixteen large a time baseline AllWISE catalog. other major change is detection list was generated using ${\it crowdsource}$ (Schlafly al. 2019), while software AllWISE....
Distance measurements to molecular clouds are important but often made separately for each cloud of interest, employing very different data and techniques. We present a large, homogeneous catalog distances clouds, most which unprecedented accuracy. determine using optical photometry stars along lines sight toward these obtained from PanSTARRS-1. simultaneously infer the reddenings stars, tracking full probability distribution function technique presented in Green et al. fit star-by-star...
SDSS-V will be an all-sky, multi-epoch spectroscopic survey of over six million objects. It is designed to decode the history Milky Way, trace emergence chemical elements, reveal inner workings stars, and investigate origin planets. also create integral-field map gas in Galaxy Local Group that 1,000x larger than current state art at high enough spatial resolution self-regulation mechanisms galactic ecosystems. pioneer systematic, monitoring across whole sky, revealing changes on timescales...
Accurate distances to local molecular clouds are critical for understanding the star and planet formation process, yet distance measurements often obtained inhomogeneously on a cloud-by-cloud basis. We have recently developed method that combines stellar photometric data with Gaia DR2 parallax in Bayesian framework infer of nearby dust typical accuracy ∼5%. After refining technique target lower latitudes incorporating deep optical from DECam southern Galactic plane, we derived catalog...
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...
Abstract Over the next 5 yr, Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on 4 m Mayall Telescope at Kitt Peak National Observatory to conduct first Stage IV dark energy galaxy survey. At z < 0.6, DESI Bright Galaxy Survey (BGS) produce most detailed map of universe during dark-energy-dominated epoch redshifts >10 million galaxies spanning 14,000 deg 2 . In this work, we present and validate final BGS target selection survey design. From Legacy...
Abstract The Dark Energy Spectroscopic Instrument (DESI) is carrying out a five-year survey that aims to measure the redshifts of tens millions galaxies and quasars, including 8 million luminous red (LRGs) in redshift range 0.4 < z ≲ 1.0. Here we present selection DESI LRG sample assess its spectroscopic performance using data from Survey Validation (SV) first two months Main Survey. sample, selected g , r W 1 photometry Legacy Imaging Surveys, highly robust against imaging systematics....
Abstract We describe the spectroscopic data processing pipeline of Dark Energy Spectroscopic Instrument (DESI), which is conducting a redshift survey about 40 million galaxies and quasars using purpose-built instrument on 4 m Mayall Telescope at Kitt Peak National Observatory. The main goal DESI to measure with unprecedented precision expansion history universe baryon acoustic oscillation technique growth rate structure space distortions. Ten spectrographs three cameras each disperse light...
Abstract The Dark Energy Spectroscopic Instrument (DESI) survey will measure large-scale structures using quasars as direct tracers of dark matter in the redshift range 0.9 < z 2.1 and Ly α forests quasar spectra at > 2.1. We present several methods to select candidate for DESI, input photometric imaging three optical bands ( g , r ) from DESI Legacy Imaging Surveys two infrared (W1, W2) Wide-field Infrared Survey Explorer. These were extensively tested during Validation DESI. In this...