Probing the Diffuse Lyα Emission on Cosmological Scales: Lyα Emission Intensity Mapping Using the Complete SDSS-IV eBOSS

Lin, Xiaojing; Zheng, Zheng; Cai, Zheng

doi:10.3847/1538-4365/ac82e8

Probing the Diffuse Lyα Emission on Cosmological Scales: Lyα Emission Intensity Mapping Using the Complete SDSS-IV eBOSS

Journal Article · Tue Sep 20 00:00:00 EDT 2022 · The Astrophysical Journal. Supplement Series

DOI:https://doi.org/10.3847/1538-4365/ac82e8· OSTI ID:2425259

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Tsinghua Univ., Beijing (China); Sloan Digital Sky Survey (SDSS) Collaboration. et al.

Based on Sloan Digital Sky Survey Data Release 16, we have detected the large-scale structure of Lyα emission in the universe at redshifts z = 2–3.5 by cross-correlating quasar positions and Lyα emission imprinted in the residual spectra of luminous red galaxies. We apply an analytical model to fit the corresponding Lyα surface brightness profile and multipoles of the redshift-space quasar–Lyα emission cross-correlation function. The model suggests an average cosmic Lyα luminosity density of $$6.6^{+3.3}_{-3.1}$$ x 10⁴⁰ erg s^-1 cMpc^-3, a ~2σ detection with a median value about 8–9 times those estimated from deep narrowband surveys of Lyα emitters at similar redshifts. Although the low signal-to-noise ratio prevents us from a significant detection of the Lyα forest–Lyα emission cross-correlation, the measurement is consistent with the prediction of our best-fit model from quasar–Lyα emission cross-correlation within current uncertainties. We rule out the scenario where the Lyα photons mainly originate from quasars. We find that Lyα emission from star-forming galaxies, including contributions from that concentrated around the galaxy centers and that in diffuse Lyα-emitting halos, is able to explain the bulk of the Lyα luminosity density inferred from our measurements. Ongoing and future surveys can further improve the measurements and advance our understanding of the cosmic Lyα emission field.

View Accepted Manuscript (DOE)

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 2425259

Journal Information:: The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 2 Vol. 262; ISSN 0067-0049

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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The Keck Cosmic Web Imager Integral Field Spectrograph Morrissey, Patrick; Matuszewski, Matuesz; Martin, D. Christopher The Astrophysical Journal, Vol. 864, Issue 1 https://doi.org/10.3847/1538-4357/aad597	journal	September 2018
Broadband Intensity Tomography: Spectral Tagging of the Cosmic UV Background Chiang, Yi-Kuan; Ménard, Brice; Schiminovich, David The Astrophysical Journal, Vol. 877, Issue 2 https://doi.org/10.3847/1538-4357/ab1b35	journal	June 2019
The Extended Baryon Oscillation Spectroscopic Survey: Measuring the Cross-correlation between the Mg ii Flux Transmission Field and Quasars and Galaxies at z = 0.59 du Mas des Bourboux, Hélion; Dawson, Kyle S.; Busca, Nicolás G. The Astrophysical Journal, Vol. 878, Issue 1 https://doi.org/10.3847/1538-4357/ab1d49	journal	June 2019
The Ly α Luminosity Function and Cosmic Reionization at z ∼ 7.0: A Tale of Two LAGER Fields Hu, Weida; Wang, Junxian; Zheng, Zhen-Ya The Astrophysical Journal, Vol. 886, Issue 2 https://doi.org/10.3847/1538-4357/ab4cf4	journal	November 2019
The Completed SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations with Ly α Forests du Mas des Bourboux, Hélion; Rich, James; Font-Ribera, Andreu The Astrophysical Journal, Vol. 901, Issue 2 https://doi.org/10.3847/1538-4357/abb085	journal	October 2020
Surface Brightness Profile of Lyman-α Halos out to 320 kpc in HETDEX Lujan Niemeyer, Maja; Komatsu, Eiichiro; Byrohl, Chris The Astrophysical Journal, Vol. 929, Issue 1 https://doi.org/10.3847/1538-4357/ac5cb8	journal	April 2022
Evolution of the Cool Gas in the Circumgalactic Medium of Massive Halos: A Keck Cosmic Web Imager Survey of Ly α Emission around QSOs at z ≈ 2 Cai, Zheng; Cantalupo, Sebastiano; Prochaska, J. Xavier The Astrophysical Journal Supplement Series, Vol. 245, Issue 2 https://doi.org/10.3847/1538-4365/ab4796	journal	November 2019
The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra Ahumada, Romina; Prieto, Carlos Allende; Almeida, Andrés The Astrophysical Journal Supplement Series, Vol. 249, Issue 1 https://doi.org/10.3847/1538-4365/ab929e	journal	June 2020
The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release Lyke, Brad W.; Higley, Alexandra N.; McLane, J. N. The Astrophysical Journal Supplement Series, Vol. 250, Issue 1 https://doi.org/10.3847/1538-4365/aba623	journal	August 2020
Keck/Palomar Cosmic Web Imagers Reveal an Enormous Ly α Nebula in an Extremely Overdense Quasi-stellar Object Pair Field at z = 2.45 Cai, Zheng; Hamden, Erika; Matuszewski, Matt The Astrophysical Journal, Vol. 861, Issue 1 https://doi.org/10.3847/2041-8213/aacce6	journal	June 2018

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