The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas*
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Published:2022-07-27
Issue:2
Volume:261
Page:31
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ISSN:0067-0049
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Container-title:The Astrophysical Journal Supplement Series
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language:
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Short-container-title:ApJS
Author:
Berg Danielle A.ORCID, James Bethan L.ORCID, King TeaganORCID, McDonald MeaghanORCID, Chen ZuyiORCID, Chisholm JohnORCID, Heckman TimothyORCID, Martin Crystal L.ORCID, Stark Dan P.ORCID, Aloisi AlessandraORCID, Amorín Ricardo O.ORCID, Arellano-Córdova Karla Z.ORCID, Bayliss MatthewORCID, Bordoloi RongmonORCID, Brinchmann JarleORCID, Charlot StéphaneORCID, Chevallard JacopoORCID, Clark IlyseORCID, Erb Dawn K.ORCID, Feltre AnnaORCID, Gronke MaxORCID, Hayes MatthewORCID, Henry AlainaORCID, Hernandez SveaORCID, Jaskot AnneORCID, Jones TuckerORCID, Kewley Lisa J.ORCID, Kumari NimishaORCID, Leitherer ClausORCID, Llerena MarioORCID, Maseda MichaelORCID, Mingozzi Matilde, Nanayakkara ThemiyaORCID, Ouchi MasamiORCID, Plat AdeleORCID, Pogge Richard W.ORCID, Ravindranath SwaraORCID, Rigby Jane R.ORCID, Sanders RyanORCID, Scarlata ClaudiaORCID, Senchyna PeterORCID, Skillman Evan D.ORCID, Steidel Charles C.ORCID, Strom Allison L.ORCID, Sugahara YumaORCID, Wilkins Stephen M.ORCID, Wofford AidaORCID, Xu XinfengORCID
Abstract
Abstract
Far-ultraviolet (FUV; ∼1200–2000 Å) spectra are fundamental to our understanding of star-forming galaxies, providing a unique window on massive stellar populations, chemical evolution, feedback processes, and reionization. The launch of the James Webb Space Telescope will soon usher in a new era, pushing the UV spectroscopic frontier to higher redshifts than ever before; however, its success hinges on a comprehensive understanding of the massive star populations and gas conditions that power the observed UV spectral features. This requires a level of detail that is only possible with a combination of ample wavelength coverage, signal-to-noise, spectral-resolution, and sample diversity that has not yet been achieved by any FUV spectral database. We present the Cosmic Origins Spectrograph Legacy Spectroscopic Survey (CLASSY) treasury and its first high-level science product, the CLASSY atlas. CLASSY builds on the Hubble Space Telescope (HST) archive to construct the first high-quality (S/N1500 Å ≳ 5/resel), high-resolution (R ∼ 15,000) FUV spectral database of 45 nearby (0.002 < z < 0.182) star-forming galaxies. The CLASSY atlas, available to the public via the CLASSY website, is the result of optimally extracting and coadding 170 archival+new spectra from 312 orbits of HST observations. The CLASSY sample covers a broad range of properties including stellar mass (6.2 < log M
⋆(M
⊙) < 10.1), star formation rate (−2.0 < log SFR (M
⊙ yr−1) < +1.6), direct gas-phase metallicity (7.0 < 12+log(O/H) < 8.8), ionization (0.5 < O32 < 38.0), reddening (0.02 < E(B − V) < 0.67), and nebular density (10 < n
e
(cm−3) < 1120). CLASSY is biased to UV-bright star-forming galaxies, resulting in a sample that is consistent with the z ∼ 0 mass–metallicity relationship, but is offset to higher star formation rates by roughly 2 dex, similar to z ≳ 2 galaxies. This unique set of properties makes the CLASSY atlas the benchmark training set for star-forming galaxies across cosmic time.
Funder
Space Telescope Science Institute National Science Foundation
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
53 articles.
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