Search Publications
The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation
Myers, Adam D.; Bailey, Stephen; Palanque-Delabrouille, Nathalie +57 more
Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI Bright Galaxy Survey (BGS) will produce the most detailed map of the universe during the dark-e…
Target Selection and Validation of DESI Luminous Red Galaxies
Moustakas, J.; Myers, Adam D.; Brooks, D. +46 more
The Dark Energy Spectroscopic Instrument (DESI) is carrying out a five-year survey that aims to measure the redshifts of tens of millions of galaxies and quasars, including 8 million luminous red galaxies (LRGs) in the redshift range 0.4 < z ≲ 1.0. Here we present the selection of the DESI LRG sample and assess its spectroscopic performance usi…
The Spectroscopic Data Processing Pipeline for the Dark Energy Spectroscopic Instrument
Alexander, D. M.; Moustakas, J.; Myers, Adam D. +55 more
We describe the spectroscopic data processing pipeline of the Dark Energy Spectroscopic Instrument (DESI), which is conducting a redshift survey of about 40 million galaxies and quasars using a purpose-built instrument on the 4 m Mayall Telescope at Kitt Peak National Observatory. The main goal of DESI is to measure with unprecedented precision th…
JWST PEARLS. Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results
Finkelstein, Steven L.; Hathi, Nimish P.; Holwerda, Benne W. +82 more
We give an overview and describe the rationale, methods, and first results from NIRCam images of the JWST "Prime Extragalactic Areas for Reionization and Lensing Science" (PEARLS) project. PEARLS uses up to eight NIRCam filters to survey several prime extragalactic survey areas: two fields at the North Ecliptic Pole (NEP); seven gravitationally le…
The Robotic Multiobject Focal Plane System of the Dark Energy Spectroscopic Instrument (DESI)
Miquel, Ramon; Sanchez, Eusebio; Serrano, Santiago +98 more
A system of 5020 robotic fiber positioners was installed in 2019 on the Mayall Telescope, at Kitt Peak National Observatory. The robots automatically retarget their optical fibers every 10-20 minutes, each to a precision of several microns, with a reconfiguration time of fewer than 2 minutes. Over the next 5 yr, they will enable the newly construc…
Target Selection and Validation of DESI Emission Line Galaxies
Moustakas, J.; Myers, Adam D.; Yèche, Christophe +49 more
The Dark Energy Spectroscopic Instrument (DESI) will precisely constrain cosmic expansion and the growth of structure by collecting ~40 million extragalactic redshifts across ~80% of cosmic history and one-third of the sky. The Emission Line galaxy (ELG) sample, which will comprise about one-third of all DESI tracers, will be used to probe the uni…
The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument
Myers, Adam D.; Bailey, Stephen; Palanque-Delabrouille, Nathalie +51 more
In 2021 May, the Dark Energy Spectroscopic Instrument (DESI) began a 5 yr survey of approximately 50 million total extragalactic and Galactic targets. The primary DESI dark-time targets are emission line galaxies, luminous red galaxies, and quasars. In bright time, DESI will focus on two surveys known as the Bright Galaxy Survey and the Milky Way …
A 3D Drizzle Algorithm for JWST and Practical Application to the MIRI Medium Resolution Spectrometer
Law, David R.; Vandenbussche, Bart; Patapis, Polychronis +4 more
We describe an algorithm for application of the classic "drizzle" technique to produce 3D spectral cubes using data obtained from the slicer-type integral field unit (IFU) spectrometers on board the James Webb Space Telescope. This algorithm relies upon the computation of overlapping volume elements (composed of two spatial dimensions and one spec…
A Noninteracting Galactic Black Hole Candidate in a Binary System with a Main-sequence Star
Dalba, Paul A.; Geha, Marla; Chang, Philip +10 more
We describe the discovery of a solar neighborhood (d = 468 pc) binary system with a main-sequence sunlike star and a massive noninteracting black hole candidate. The spectral energy distribution of the visible star is described by a single stellar model. We derive stellar parameters from a high signal-to-noise Magellan/MIKE spectrum, classifying t…
Free-floating Planet Mass Function from MOA-II 9 yr Survey toward the Galactic Bulge
Fukui, Akihiko; Sumi, Takahiro; Bond, Ian A. +25 more
We present the first measurement of the mass function of free-floating planets (FFPs), or very wide orbit planets down to an Earth mass, from the MOA-II microlensing survey in 2006-2014. Six events are likely to be due to planets with Einstein radius crossing times t E < 0.5 days, and the shortest has t E = 0.057 ± 0.016 d…