David W. Hogg
A5025226631- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- SAS software applications and methods
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Gaussian Processes and Bayesian Inference
- Radio Astronomy Observations and Technology
- Advanced Statistical Methods and Models
- Pulsars and Gravitational Waves Research
- Remote Sensing in Agriculture
- Impact of Light on Environment and Health
- Spectroscopy and Chemometric Analyses
- Astrophysics and Cosmic Phenomena
- Statistical and numerical algorithms
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
New York University
2015-2024
Max Planck Institute for Astronomy
2015-2024
Flatiron Health (United States)
2017-2024
Flatiron Institute
2017-2024
University of Leeds
2023
Simons Foundation
2016-2022
Centre for Cosmology and Particle Physics Phenomenology
2019
Max Planck Society
2019
Princess Margaret Cancer Centre
2019
Institute of Electrical and Electronics Engineers
2019
We introduce a stable, well tested Python implementation of the affine-invariant ensemble sampler for Markov chain Monte Carlo (MCMC) proposed by Goodman & Weare (2010). The code is open source and has already been used in several published projects astrophysics literature. algorithm behind emcee advantages over traditional MCMC sampling methods it excellent performance as measured autocorrelation time (or function calls per independent sample). One major advantage that requires hand-tuning...
This paper describes the Seventh Data Release of Sloan Digital Sky Survey (SDSS), marking completion original goals SDSS and end phase known as SDSS-II. It includes 11,663 deg2 imaging data, with most ∼2000 increment over previous data release lying in regions low Galactic latitude. The catalog contains five-band photometry for 357 million distinct objects. survey also repeat on a 120° long, 25 wide stripe along celestial equator Southern Cap, some covered by many 90 individual runs. We...
We measure cosmological parameters using the three-dimensional power spectrum $P(k)$ from over 200 000 galaxies in Sloan Digital Sky Survey (SDSS) combination with Wilkinson Microwave Anisotropy Probe (WMAP) and other data. Our results are consistent a ``vanilla'' flat adiabatic cold dark matter model constant without tilt ${(n}_{s}=1),$ running tilt, tensor modes, or massive neutrinos. Adding SDSS information more than halves WMAP-only error bars on some parameters, tightening...
Abstract Multi-epoch radial velocity measurements of stars can be used to identify stellar, substellar, and planetary-mass companions. Even a small number observation epochs informative about companions, though there multiple qualitatively different orbital solutions that fit the data. We have custom-built Monte Carlo sampler ( The Joker ) delivers reliable (and often highly multimodal) posterior samplings for companion parameters given sparse Here we use perform search companions 96,231 red...
We present the large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies Sloan Digital Sky Survey. The survey region covers 0.72 h-3 Gpc3 over 3816 deg2 and 0.16 < z 0.47, making it best yet for study structure. find well-detected peak in at 100 h-1 Mpc separation that is an excellent match to predicted shape location imprint recombination-epoch acoustic oscillations on low-redshift clustering matter. This detection demonstrates linear growth...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere collect spectra ≈106 galaxies, 100,000 quasars, 30,000 stars, serendipity targets. In 2001 June, SDSS released to general astronomical community its early data release, roughly 462 deg2 including almost 14 million detected objects 54,008 follow-up spectra. were collected in drift-scan mode five bandpasses (u, g, r, i, z); our 95% completeness...
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...
We measure the large-scale real-space power spectrum P(k) using a sample of 205,443 galaxies from Sloan Digital Sky Survey, covering 2417 square degrees with mean redshift z~0.1. employ matrix-based method pseudo-Karhunen-Loeve eigenmodes, producing uncorrelated minimum-variance measurements in 22 k-bands both clustering and its anisotropy due to redshift-space distortions, narrow well-behaved window functions range 0.02 h/Mpc < k 0.3h/Mpc. pay particular attention modeling, quantifying...
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,...
We measure the large-scale real-space power spectrum $P(k)$ using luminous red galaxies (LRGs) in Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological parameters from Wilkinson Microwave Anisotropy Probe (WMAP). employ a matrix-based estimation method Pseudo-Karhunen-Lo\`eve eigenmodes, producing uncorrelated minimum-variance measurements 20 $k$-bands of both clustering its anisotropy due redshift-space distortions, with narrow well-behaved window...
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...
This paper describes the Sixth Data Release of Sloan Digital Sky Survey. With this data release, imaging northern Galactic cap is now complete. The survey contains images and parameters roughly 287 million objects over 9583 deg2, including scans a large range latitudes longitudes. also includes 1.27 spectra stars, galaxies, quasars, blank sky (for subtraction) selected 7425 deg2. release much more stellar spectroscopy than was available in previous releases detailed estimates temperatures,...
Here we present the New York University Value-Added Galaxy Catalog (NYU-VAGC), a catalog of local galaxies (mostly below redshift about 0.3) based on set publicly-released surveys (including 2dFGRS, 2MASS, PSCz, FIRST, and RC3) matched to Sloan Digital Sky Survey (SDSS) Data Release 2. Excluding areas masked by bright stars, photometric sample covers 3514 square degrees spectroscopic 2627 (with 85% completeness). Earlier, proprietary versions this have formed basis many SDSS investigations...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg2 five-band (ugriz) imaging with photometry for over 88 million unique objects, 367,360 spectra galaxies, quasars, stars, calibrating blank sky patches selected 2627 this area, tables measured parameters from these data. reach a depth r ≈ 22.2 (95% completeness limit point sources) are photometrically astrometrically calibrated to 2% rms 100 mas per...
This paper describes the Fourth Data Release of Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The release includes five-band photometric for 180 million objects selected over 6670 deg2 and 673,280 spectra galaxies, quasars, stars from 4783 those imaging using standard SDSS target selection algorithms. These numbers represent a roughly 27% increment Third Release; previous releases are included in present release. also an additional 131,840...
Using a catalog of 147,986 galaxy redshifts and fluxes from the Sloan Digital Sky Survey (SDSS), we measure luminosity density at z = 0.1 in five optical bandpasses corresponding to SDSS shifted match their rest-frame shape 0.1. We denote bands 0.1u, 0.1g, 0.1r, 0.1i, 0.1z with λeff (3216, 4240, 5595, 6792, 8111 Å), respectively. To estimate function, use maximum likelihood method that allows for general form fits simple number evolution, incorporates flux uncertainties, accounts limits...
We describe the target selection and resulting properties of a spectroscopic sample luminous red galaxies (LRGs) from imaging data Sloan Digital Sky Survey (SDSS). These are selected on basis color magnitude to yield intrinsically that extends fainter farther than main flux-limited portion SDSS galaxy sample. The is designed impose passively evolving luminosity rest-frame cut redshift 0.38. Additional, yet more included ∼0.5. Approximately 12 these per square degree targeted for...
The Sloan Digital Sky Survey has validated and made publicly available its First Data Release. This consists of 2099 square degrees five-band (u, g, r, i, z) imaging data, 186,240 spectra galaxies, quasars, stars calibrating blank sky patches selected over 1360 this area, tables measured parameters from these data. data go to a depth r ~ 22.6 are photometrically astrometrically calibrated 2% rms 100 milli-arcsec per coordinate, respectively. cover the range 3800--9200 A, with resolution...
We have built a reliable and robust system that takes as input an astronomical image, returns output the pointing, scale, orientation of image (the astrometric calibration or WCS information). The requires no first guess, works with information in pixels alone; is, problem is generalization "lost space" which nothing--not even scale--is known. After source detection performed asterisms (sets four five stars) are geometrically hashed compared to pre-indexed hashes generate hypotheses about...
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 describes the Third Data Release of Sloan Digital Sky Survey (SDSS). release, containing data taken up through 2003 June, includes imaging in five bands over 5282 deg2, photometric and astrometric catalogs 141 million objects detected these data, spectra 528,640 selected 4188 deg2. The pipelines analyzing both images spectroscopy are unchanged from those used our Second Release.
This paper describes the Fifth Data Release (DR5) of Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through June 2005 and represents completion SDSS-I project (whose successor, SDSS-II will continue mid-2008). It five-band photometric for 217 million objects selected over 8000 square degrees, 1,048,960 spectra galaxies, quasars, stars from 5713 degrees that imaging data. These numbers represent a roughly 20% increment those Fourth Release; previous releases are...
Using photometry and spectroscopy of 144,609 galaxies from the Sloan Digital Sky Survey, we present bivariate distributions pairs seven galaxy properties: four optical colors, surface brightness, radial profile shape as measured by Sersic index, absolute magnitude. In addition, dependence local density (smoothed on 8 h^{-1} Mpc scales) all these properties. Several classic, well-known relations among properties are evident at extremely high signal-to-noise ratio: color-color galaxies,...
An unsupervised software ``robot'' that automatically and robustly reduces analyzes CCD observations of photometric standard stars is described. The robot measures extinction coefficients other parameters in real time and, more carefully, on the next day. It also data from an all-sky $10 \mu m$ camera to detect clouds; taken during cloudy periods are rejected. reports its findings back observers analysts via World-Wide Web. can be used assess photometricity, build site conditions. robot's...