The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument
Author:
Myers Adam D., Moustakas JohnORCID, Bailey StephenORCID, Weaver Benjamin A., Cooper Andrew P.ORCID, Forero-Romero Jaime E.ORCID, Abolfathi BelaORCID, Alexander David M.ORCID, Brooks DavidORCID, Chaussidon EdmondORCID, Chuang Chia-HsunORCID, Dawson KyleORCID, Dey ArjunORCID, Dey BiprateepORCID, Dhungana GovindaORCID, Doel Peter, Fanning Kevin, Gaztañaga EnriqueORCID, A Gontcho Satya Gontcho, Gonzalez-Morales Alma X.ORCID, Hahn ChangHoonORCID, Herrera-Alcantar Hiram K.ORCID, Honscheid Klaus, Ishak MustaphaORCID, Karim TanveerORCID, Kirkby DavidORCID, Kisner TheodoreORCID, Koposov Sergey E.ORCID, Kremin AnthonyORCID, Lan Ting-WenORCID, Landriau MartinORCID, Lang DustinORCID, Levi Michael E.ORCID, Magneville Christophe, Napolitano LucasORCID, Martini PaulORCID, Meisner AaronORCID, Newman Jeffrey A.ORCID, Palanque-Delabrouille NathalieORCID, Percival WillORCID, Poppett Claire, Prada FranciscoORCID, Raichoor AnandORCID, Ross Ashley J., Schlafly Edward F.ORCID, Schlegel DavidORCID, Schubnell Michael, Tan TingORCID, Tarle GregoryORCID, Wilson Michael J., Yèche ChristopheORCID, Zhou RongpuORCID, Zhou ZhiminORCID, Zou HuORCID
Abstract
Abstract
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 Survey. DESI also observes a selection of “secondary” targets for bespoke science goals. This paper gives an overview of the publicly available pipeline (desitarget) used to process targets for DESI observations. Highlights include details of the different DESI survey targeting phases, the targeting ID (TARGETID) used to define unique targets, the bitmasks used to indicate a particular type of target, the data model and structure of DESI targeting files, and examples of how to access and use the desitarget code base. This paper will also describe “supporting” DESI target classes, such as standard stars, sky locations, and random catalogs that mimic the angular selection function of DESI targets. The DESI target-selection pipeline is complex and sizable; this paper attempts to summarize the most salient information required to understand and work with DESI targeting data.
Funder
U.S. Department of Energy Taiwan Ministry of Science and Technology National Science Foundation
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
57 articles.
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