Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly<i>α</i>emitters and IGM transmission in the COSMOS field at<i>z</i>˜ 5

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  • Koki Kakiichi
    Department of Physics , Broida Hall, University of California, Santa Barbara, CA 93106-9530, USA
  • Joseph F Hennawi
    Department of Physics , Broida Hall, University of California, Santa Barbara, CA 93106-9530, USA
  • Yoshiaki Ono
    Institute for Cosmic Ray Research, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
  • Akio K Inoue
    Faculty of Science and Engineering, Waseda Research Institute for Science and Engineering, Waseda University , 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan
  • Masami Ouchi
    Institute for Cosmic Ray Research, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan
  • Richard S Ellis
    Department of Physics and Astronomy, University College London , Gower Street, London WC1E 6BT, UK
  • Romain A Meyer
    Max Planck Institut für Astronomie , Königstuhl 17, D-69117 Heidelberg, Germany
  • Sarah I Bosman
    Max Planck Institut für Astronomie , Königstuhl 17, D-69117 Heidelberg, Germany

書誌事項

公開日
2023-05-08
資源種別
journal article
権利情報
  • https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model
DOI
  • 10.1093/mnras/stad1376
  • 10.48550/arxiv.2301.00373
公開者
Oxford University Press (OUP)

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説明

<jats:title>ABSTRACT</jats:title><jats:p>We present a novel technique called ‘photometric IGM tomography’ to map the intergalactic medium (IGM) at z ≃ 4.9 in the COSMOS field. It utilizes deep narrow-band (NB) imaging to photometrically detect faint Ly α forest transmission in background galaxies across the Subaru/Hyper-Suprime Cam (HSC)’s $1.8\rm \, sq.\, deg$ field of view and locate Ly α emitters (LAEs) in the same cosmic volume. Using ultra-deep HSC images and Bayesian spectral energy distribution fitting, we measure the Ly α forest transmission at z ≃ 4.9 along a large number (140) of background galaxies selected from the DEIMOS10k spectroscopic catalogue at 4.98 &lt; z &lt; 5.89 and the SILVERRUSH LAEs at z ≃ 5.7. We photometrically measure the mean Ly α forest transmission and achieve a result consistent with previous measurements based on quasar spectra. We also measure the angular LAE-Ly α forest cross-correlation and Ly α forest autocorrelation functions and place an observational constraint on the large-scale fluctuations of the IGM around LAEs at z ≃ 4.9. Finally, we present the reconstructed 2D tomographic map of the IGM, co-spatial with the large-scale structure of LAEs, at a transverse resolution of $11 \, h^{-1}\rm cMpc$ across $140\, h^{-1}\rm cMpc$ in the COSMOS field at z ≃ 4.9. We discuss the observational requirements and the potential applications of this new technique for understanding the sources of reionization, quasar radiative history, and galaxy–IGM correlations across z ∼ 3–6. Our results represent the first proof-of-concept of photometric IGM tomography, offering a new route to examining early galaxy evolution in the context of the large-scale cosmic web from the epoch of reionization to cosmic noon.</jats:p>

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