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.

doi:10.3847/1538-4365/ac6c03

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.

Physics And Astronomy

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20 Scopus citations

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/N_{1500 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.

Original language	English
Article number	31
Journal	Astrophysical Journal, Supplement Series
Volume	261
Issue number	2
DOIs	https://doi.org/10.3847/1538-4365/ac6c03
State	Published - Aug 1 2022

Bibliographical note

Funding Information:
This paper made use of the modsIDL spectral data reduction pipeline developed in part with funds provided by NSF grant AST-1108693 and a generous gift from OSU Astronomy alumnus David G. Price through the Price Fellowship in Astronomical Instrumentation. This research has made use of the HSLA database, developed and maintained at STScI, Baltimore, USA.

Funding Information:
The CLASSY team thanks the referee for thoughtful feedback that significantly improved both the paper and the HLSPs. D.A.B. is grateful for the support for this program, HST-GO-15840, that was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Associations of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. B.L.J. is grateful for support from the European Space Agency (ESA). The CLASSY collaboration extends special gratitude to the Lorentz Center for useful discussions during the “Characterizing Galaxies with Spectroscopy with a view for JWST” 2017 workshop that led to the formation of the CLASSY collaboration and survey.

Funding Information:
Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III website is http://www.sdss3.org/ .

Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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(2022). 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. Astrophysical Journal, Supplement Series, 261(2), Article 31. https://doi.org/10.3847/1538-4365/ac6c03

/ 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. In: Astrophysical Journal, Supplement Series. 2022 ; Vol. 261, No. 2.

@article{2112ae18b09746c685cf61552a3b86d5,

title = "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.",

abstract = "Far-ultraviolet (FUV; ∼1200-2000 {\AA}) 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 {\AA} ≳ 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.",

author = "Berg, {Danielle A.} and James, {Bethan L.} and Teagan King and Meaghan McDonald and Zuyi Chen and John Chisholm and Timothy Heckman and Martin, {Crystal L.} and Stark, {Dan P.} and Alessandra Aloisi and Amor{\'i}n, {Ricardo O.} and Arellano-C{\'o}rdova, {Karla Z.} and Matthew Bayliss and Rongmon Bordoloi and Jarle Brinchmann and St{\'e}phane Charlot and Jacopo Chevallard and Ilyse Clark and Erb, {Dawn K.} and Anna Feltre and Max Gronke and Matthew Hayes and Alaina Henry and Svea Hernandez and Anne Jaskot and Tucker Jones and Kewley, {Lisa J.} and Nimisha Kumari and Claus Leitherer and Mario Llerena and Michael Maseda and Matilde Mingozzi and Themiya Nanayakkara and Masami Ouchi and Adele Plat and Pogge, {Richard W.} and Swara Ravindranath and Rigby, {Jane R.} and Ryan Sanders and Claudia Scarlata and Peter Senchyna and Skillman, {Evan D.} and Steidel, {Charles C.} and Strom, {Allison L.} and Yuma Sugahara and Wilkins, {Stephen M.} and Aida Wofford and Xinfeng Xu",

note = "Funding Information: This paper made use of the modsIDL spectral data reduction pipeline developed in part with funds provided by NSF grant AST-1108693 and a generous gift from OSU Astronomy alumnus David G. Price through the Price Fellowship in Astronomical Instrumentation. This research has made use of the HSLA database, developed and maintained at STScI, Baltimore, USA. Funding Information: The CLASSY team thanks the referee for thoughtful feedback that significantly improved both the paper and the HLSPs. D.A.B. is grateful for the support for this program, HST-GO-15840, that was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Associations of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. B.L.J. is grateful for support from the European Space Agency (ESA). The CLASSY collaboration extends special gratitude to the Lorentz Center for useful discussions during the “Characterizing Galaxies with Spectroscopy with a view for JWST” 2017 workshop that led to the formation of the CLASSY collaboration and survey. Funding Information: Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III website is http://www.sdss3.org/ . Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = aug,

day = "1",

doi = "10.3847/1538-4365/ac6c03",

language = "English",

volume = "261",

number = "2",

}

2022, '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.', Astrophysical Journal, Supplement Series, vol. 261, no. 2, 31. https://doi.org/10.3847/1538-4365/ac6c03

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. /.
In: Astrophysical Journal, Supplement Series, Vol. 261, No. 2, 31, 01.08.2022.

Research output: Contribution to journal › Article › peer-review

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 - 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 - Funding Information: This paper made use of the modsIDL spectral data reduction pipeline developed in part with funds provided by NSF grant AST-1108693 and a generous gift from OSU Astronomy alumnus David G. Price through the Price Fellowship in Astronomical Instrumentation. This research has made use of the HSLA database, developed and maintained at STScI, Baltimore, USA. Funding Information: The CLASSY team thanks the referee for thoughtful feedback that significantly improved both the paper and the HLSPs. D.A.B. is grateful for the support for this program, HST-GO-15840, that was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Associations of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. B.L.J. is grateful for support from the European Space Agency (ESA). The CLASSY collaboration extends special gratitude to the Lorentz Center for useful discussions during the “Characterizing Galaxies with Spectroscopy with a view for JWST” 2017 workshop that led to the formation of the CLASSY collaboration and survey. Funding Information: Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III website is http://www.sdss3.org/ . 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.

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