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Berg, Danielle A.; James, Bethan L.; King, Teagan; McDonald, Meaghan; Chen, Zuyi; Chisholm, John; Heckman, Timothy; Martin, Crystal L.; Stark, Dan P.; Aloisi, Alessandra; Amorín, Ricardo O.; Arellano-Córdova, Karla Z.; Bayliss, Matthew; Bordoloi, Rongmon; Brinchmann, Jarle; Charlot, Stéphane; Chevallard, Jacopo; Clark, Ilyse; Erb, Dawn K.; Feltre, Anna; Gronke, Max; Hayes, Matthew; Henry, Alaina; Hernandez, Svea; [...]

The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas*

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  • Media type: E-Article
  • Title: The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas*
  • Contributor: Berg, Danielle A.; James, Bethan L.; King, Teagan; McDonald, Meaghan; Chen, Zuyi; Chisholm, John; Heckman, Timothy; Martin, Crystal L.; Stark, Dan P.; Aloisi, Alessandra; Amorín, Ricardo O.; Arellano-Córdova, Karla Z.; Bayliss, Matthew; Bordoloi, Rongmon; Brinchmann, Jarle; Charlot, Stéphane; Chevallard, Jacopo; Clark, Ilyse; Erb, Dawn K.; Feltre, Anna; Gronke, Max; Hayes, Matthew; Henry, Alaina; Hernandez, Svea; [...]
  • Published: American Astronomical Society, 2022
  • Published in: The Astrophysical Journal Supplement Series, 261 (2022) 2, Seite 31
  • Language: Not determined
  • DOI: 10.3847/1538-4365/ac6c03
  • ISSN: 0067-0049; 1538-4365
  • Origination:
  • Footnote:
  • Description: 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.
  • Access State: Open Access