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Probing Ultralate R...
Probing Ultralate Reionization: Direct Measurements of the Mean Free Path over 5 z
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Zhu, Yongda (author)
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Becker, George D. (author)
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Christenson, Holly M. (author)
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D'Aloisio, Anson (author)
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- Bosman, Sarah E. I. (author)
- Ruprecht-Karls-Universität Heidelberg,Heidelberg University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Bakx, Tom, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- D'Odorico, Valentina (author)
- Scuola Normale Superiore di Pisa,Istituto nazionale di astrofisica (INAF),IFPU—Institute for Fundamental Physics of the Universe
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- Bischetti, Manuela (author)
- Universita degli Studi di Trieste,University of Trieste
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Cain, Christopher (author)
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- Davies, Frederick B. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Davies, Rebecca L. (author)
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D),Swinburne University of Technology
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- Eilers, Anna-Christina (author)
- Massachusetts Institute of Technology (MIT)
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- Fan, Xiaohui (author)
- University of Arizona
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- Gaikwad, Prakash (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Haehnelt, Martin G. (author)
- University of Edinburgh
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- Keating, Laura C. (author)
- University of Edinburgh
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- Kulkarni, Girish (author)
- Tata Institute of Fundamental Research
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- Lai, Samuel (author)
- Australian National University
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- Ma, Hai-Xia (author)
- Nagoya University
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- Mesinger, Andrei (author)
- Scuola Normale Superiore di Pisa
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- Qin, Yuxiang (author)
- University of Melbourne,ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
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- Satyavolu, Sindhu (author)
- Tata Institute of Fundamental Research
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- Takeuchi, Tsutomu T. (author)
- The Institute of Statistical Mathematics (ISM),Nagoya University
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- Umehata, Hideki (author)
- Nagoya University
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- Yang, Jinyi (author)
- University of Arizona
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Ruprecht-Karls-Universität Heidelberg Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) (creator_code:org_t)
- 2023
- 2023
- English.
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In: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 955:2
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https://research.cha... (primary) (free)
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https://doi.org/10.3...
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Abstract
Subject headings
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- The mean free path of ionizing photons, lambda(mfp), is a critical parameter for modeling the intergalactic medium (IGM) both during and after reionization. We present direct measurements of lambda(mfp) from QSO spectra over the redshift range 5 < z < 6, including the first measurements at z similar or equal to 5.3 and 5.6. Our sample includes data from the XQR-30 VLT large program, as well as new Keck/ESI observations of QSOs near z similar to 5.5, for which we also acquire new [C II] 158 mu m redshifts with ALMA. By measuring the Lyman continuum transmission profile in stacked QSO spectra, we find lambda(mfp) = 9.33(-1.80)(+2.06), 5.40(-1.40)(+1.47), 3.31(-1.34)(+2.74), and 0.81(-0.48)(+0.73) pMpc at z = 5.08, 5.31, 5.65, and 5.93, respectively. Our results demonstrate that lambda(mfp) increases steadily and rapidly with time over 5 < z < 6. Notably, we find that lambda(mfp) deviates significantly from predictions based on a fully ionized and relaxed IGM as late as z = 5.3. By comparing our results to model predictions and indirect lambda(mfp) constraints based on IGM Ly alpha opacity, we find that the evolution of lambda(mfp) is consistent with scenarios wherein the IGM is still undergoing reionization and/or retains large fluctuations in the ionizing UV background well below redshift 6.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- ref (subject category)
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Zhu, Yongda
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Becker, George D ...
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Christenson, Hol ...
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D'Aloisio, Anson
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Bosman, Sarah E. ...
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Bakx, Tom, 1990
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show more...
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D'Odorico, Valen ...
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Bischetti, Manue ...
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Cain, Christophe ...
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Davies, Frederic ...
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Davies, Rebecca ...
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Eilers, Anna-Chr ...
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Fan, Xiaohui
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Gaikwad, Prakash
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Haehnelt, Martin ...
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Keating, Laura C ...
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Kulkarni, Girish
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Lai, Samuel
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Ma, Hai-Xia
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Mesinger, Andrei
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Qin, Yuxiang
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Satyavolu, Sindh ...
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Takeuchi, Tsutom ...
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Umehata, Hideki
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Yang, Jinyi
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NATURAL SCIENCES
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Chalmers University of Technology