TY - JOUR
T1 - The COS Legacy Archive Spectroscopy Survey (CLASSY) Treasury Atlas* ∗ 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.
AU - The CLASSY Team
AU - Berg, Danielle A.
AU - James, Bethan L.
AU - King, Teagan
AU - McDonald, Meaghan
AU - Chen, Zuyi
AU - Chisholm, John
AU - Heckman, Timothy
AU - Martin, Crystal L.
AU - Stark, Dan P.
AU - Aloisi, Alessandra
AU - Amorín, Ricardo O.
AU - Arellano-Córdova, Karla Z.
AU - Bayliss, Matthew
AU - Bordoloi, Rongmon
AU - Brinchmann, Jarle
AU - Charlot, Stéphane
AU - Chevallard, Jacopo
AU - Clark, Ilyse
AU - Erb, Dawn K.
AU - Feltre, Anna
AU - Gronke, Max
AU - Hayes, Matthew
AU - Henry, Alaina
AU - Hernandez, Svea
AU - Jaskot, Anne
AU - Jones, Tucker
AU - Kewley, Lisa J.
AU - Kumari, Nimisha
AU - Leitherer, Claus
AU - Llerena, Mario
AU - Maseda, Michael
AU - Mingozzi, Matilde
AU - Nanayakkara, Themiya
AU - Ouchi, Masami
AU - Plat, Adele
AU - Pogge, Richard W.
AU - Ravindranath, Swara
AU - Rigby, Jane R.
AU - Sanders, Ryan
AU - Scarlata, Claudia
AU - Senchyna, Peter
AU - Skillman, Evan D.
AU - Steidel, Charles C.
AU - Strom, Allison L.
AU - Sugahara, Yuma
AU - Wilkins, Stephen M.
AU - Wofford, Aida
AU - Xu, Xinfeng
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/8/1
Y1 - 2022/8/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85149567449
U2 - 10.3847/1538-4365/ac6c03
DO - 10.3847/1538-4365/ac6c03
M3 - Article
AN - SCOPUS:85149567449
SN - 0067-0049
VL - 261
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
IS - 2
M1 - 31
ER -