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Journal Articles The Astrophysical Journal Supplement Series Year : 2022

The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas

Danielle A. Berg
  • Function : Author
Bethan L. James
  • Function : Author
Teagan King
  • Function : Author
Meaghan Mcdonald
  • Function : Author
Zuyi Chen
  • Function : Author
John Chisholm
  • Function : Author
Timothy Heckman
  • Function : Author
Crystal L. Martin
  • Function : Author
Dan P. Stark
  • Function : Author
Alessandra Aloisi
  • Function : Author
Ricardo O. Amorín
  • Function : Author
Karla Z. Arellano-Córdova
  • Function : Author
Matthew Bayliss
  • Function : Author
Rongmon Bordoloi
  • Function : Author
Jarle Brinchmann
  • Function : Author
Ilyse Clark
  • Function : Author
Dawn K. Erb
  • Function : Author
Anna Feltre
  • Function : Author
Max Gronke
  • Function : Author
Matthew Hayes
  • Function : Author
Alaina Henry
  • Function : Author
Svea Hernandez
  • Function : Author
Anne Jaskot
  • Function : Author
Tucker Jones
  • Function : Author
Lisa J. Kewley
  • Function : Author
Nimisha Kumari
  • Function : Author
Claus Leitherer
  • Function : Author
Mario Llerena
  • Function : Author
Michael Maseda
  • Function : Author
Matilde Mingozzi
  • Function : Author
Themiya Nanayakkara
  • Function : Author
Masami Ouchi
  • Function : Author
Adele Plat
  • Function : Author
Richard W. Pogge
  • Function : Author
Swara Ravindranath
  • Function : Author
Jane R. Rigby
  • Function : Author
Ryan Sanders
  • Function : Author
Claudia Scarlata
  • Function : Author
Peter Senchyna
  • Function : Author
Evan D. Skillman
  • Function : Author
Charles C. Steidel
  • Function : Author
Allison L. Strom
  • Function : Author
Yuma Sugahara
  • Function : Author
Stephen M. Wilkins
  • Function : Author
Aida Wofford
  • Function : Author
Xinfeng Xu
  • Function : Author

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. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
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insu-03748234 , version 1 (09-08-2022)

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Danielle A. Berg, Bethan L. James, Teagan King, Meaghan Mcdonald, Zuyi Chen, et al.. The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas. The Astrophysical Journal Supplement Series, 2022, 261, ⟨10.3847/1538-4365/ac6c03⟩. ⟨insu-03748234⟩
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