Subaru Medium-resolution Spectra of a QSO at z = 6.62: Three Reionization Tests

Lu, Ting-Yi; Goto, Tomotsugu; Tang, Ji-Jia; Hashimoto, Tetsuya; Wong, Yi Hang Valerie; Chiang, Chia-Ying; Wu, Yuefeng; Kim, Seong‐Jin; Ho, Simon C-C; Wang, Ting-Wen; On, Alvina Y. L.; Santos, Daryl Joe D.

doi:10.3847/1538-4357/ab7db7

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…In all cases, we report a collection of constraints from the literature. The reionization history of the thesan runs is consistent with the bulk of observations (from Fan et al 2006;Totani et al 2006;Ota et al 2008;Bolton et al 2012;Ouchi et al 2010;McGreer et al 2011McGreer et al , 2015Mortlock et al 2011;Ono et al 2012;Chornock et al 2013;Robertson et al 2013;Schroeder et al 2013;Pentericci et al 2014;Schenker et al 2014;Tilvi et al 2014;Mesinger et al 2014;Sobacchi & Mesinger 2015;Greig et al 2017;Greig et al 2019;Davies et al 2018;Hiss et al 2018;Mason et al 2018;Mason et al 2019;Hoag et al 2019;Lu et al 2020;Wang et al 2020;Yang et al 2020a). This is by construction, as we explicitly tune the stellar (unresolved) escape fraction of the simulations to obtain a realistic reionization history.…”

Section: Properties Of the Igmsupporting

confidence: 78%

The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies

Garaldi,

Kannan,

Smith

et al. 2021

Preprint

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The high-redshift intergalactic medium (IGM) and the primeval galaxy population are rapidly becoming the new frontier of extra-galactic astronomy. We investigate the IGM properties and their connection to galaxies at z ≥ 5.5 under different assumptions for the ionizing photon escape and the nature of dark matter, employing our novel thesan radiation-hydrodynamical simulation suite, designed to provide a comprehensive picture of the emergence of galaxies in a full reionization context. Our simulations have realistic 'late' reionization histories, match available constraints on global IGM properties and reproduce the recently-observed rapid evolution of the mean free path of ionizing photons. We additionally examine high-z Lyman-α transmission. The optical depth evolution is consistent with data, and its distribution suggests an even-later reionization than simulated, although with a strong sensitivity to the source model. We show that the effects of these two unknowns can be disentangled by characterising the spectral shape and separation of Lyman-α transmission regions, opening up the possibility to observationally constrain both. For the first time in simulations, thesan reproduces the modulation of the Lyman-α flux as a function of galaxy distance, demonstrating the power of coupling a realistic galaxy formation model with proper radiation-hydrodynamics. We find this feature to be extremely sensitive on the timing of reionization, while being relatively insensitive to the source model. Overall, thesan produces a realistic IGM and galaxy population, providing a robust framework for future analysis of the high-z Universe.

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Section: Properties Of the Igmsupporting

confidence: 78%

The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies

Garaldi,

Kannan,

Smith

et al. 2021

Preprint

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“…Lyα (1216 Å) emission from astrophysical sources has long been used as a tracer of neutral gas in the intergalactic medium (IGM; e.g., Gunn & Peterson 1965;Miralda-Escude 1998). At z  6, the declining strength of Lyα emission from galaxies has been used to infer the timing of reionization (e.g., Ouchi et al 2010;Stark et al 2010;Treu et al 2012;Mesinger et al 2015;Mason et al 2018a;Morales et al 2021;Bolan et al 2022), complementary to measurements from the cosmic microwave background (CMB) electron scattering optical depth (Planck Collaboration et al 2020) and the optical depth in the Lyα forest of quasars (e.g., Fan et al 2006;McGreer et al 2015;Lu et al 2020;Qin et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Early Results from GLASS-JWST. XXIII. The Transmission of Lyα from UV-faint z ∼ 3–6 Galaxies

Prieto-Lyon,

Mason,

Mascia

et al. 2023

ApJ

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Lyα emission from galaxies can be used to trace neutral hydrogen in the epoch of reionization, however, there is a degeneracy between the attenuation of Lyα in the intergalactic medium (IGM) and the line profile emitted by the galaxy. Large shifts of Lyα redward of systemic due to scattering in the interstellar medium can boost Lyα transmission in the IGM during reionization. The relationship between the Lyα velocity offset from systemic and other galaxy properties is not well established at high redshift or low luminosities, due to the difficulty of observing emission lines which trace the systemic redshift. Rest-frame optical spectroscopy with JWST/NIRSpec has opened a new window into understanding Lyα at z > 3. We present a sample of 12 UV-faint galaxies (−20 ≲ M UV ≲ −16) at 3 ≲ z ≲ 6, with Lyα velocity offsets, Δv Lyα , measured from the Very Large Telescope/MUSE and JWST/NIRSpec from the GLASS-JWST Early Release Program. We find a median Δv Lyα of 205 km s−1 and standard deviation of 75 km s−1, compared to 320 and 170 km s−1, respectively, for M UV < −20 galaxies in the literature. Our new sample demonstrates the previously observed trend of decreasing Lyα velocity offset with decreasing UV luminosity and optical line velocity dispersion, which extends to M UV ≳ −20, consistent with a picture where the Lyα profile is shaped by gas close to the systemic redshift. Our results imply that during reionization Lyα from UV-faint galaxies will be preferentially attenuated, but that detecting Lyα with low Δv Lyα can be an indicator of large ionized bubbles.

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“…Using Ly𝛼 absorption and its damping wing is one of ★ E-mail: tetsuya@phys.nthu.edu.tw the traditional methods. High-redshift (high-𝑧) bright sources such as QSOs and optical afterglows of long gamma-ray bursts (LGRBs) are used as background light sources (e.g., Fan et al 2002;Goto 2006;Becker et al 2015;Barnett et al 2017;Bosman et al 2018;Lu et al 2020;Totani et al 2014;Hartoog et al 2015;Melandri et al 2015). Their light is absorbed by the intervening intergalactic medium between the source and the observer, producing Ly𝛼 absorption features which are imprinted in their spectra.…”

Section: Introductionmentioning

confidence: 99%

Revealing the cosmic reionisation history with fast radio bursts in the era of Square Kilometre Array

Hashimoto,

Goto,

et al. 2021

Preprint

Self Cite

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Revealing the cosmic reionisation history is at the frontier of extragalactic astronomy. The power spectrum of the cosmic microwave background (CMB) polarisation can be used to constrain the reionisation history. Here we propose a CMB-independent method using fast radio bursts (FRBs) to directly measure the ionisation fraction of the intergalactic medium (IGM) as a function of redshift. FRBs are new astronomical transients with millisecond timescales. Their dispersion measure (DM IGM ) is an indicator of the amount of ionised material in the IGM. Since the differential of DM IGM against redshift is proportional to the ionisation fraction, our method allows us to directly measure the reionisation history without any assumption on its functional shape. As a proof of concept, we constructed mock non-repeating FRB sources to be detected with the Square Kilometre Array, assuming three different reionisation histories with the same optical depth of Thomson scattering. We considered three cases of redshift measurements: (A) spectroscopic redshift for all mock data, (B) spectroscopic redshift for 10% of mock data, and (C) redshift estimated from an empirical relation of FRBs between their time-integrated luminosity and rest-frame intrinsic duration. In all cases, the reionisation histories are consistently reconstructed from the mock FRB data using our method. Our results demonstrate the capability of future FRBs in constraining the reionisation history.

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Subaru Medium-resolution Spectra of a QSO at z = 6.62: Three Reionization Tests

Cited by 8 publications

References 37 publications

The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies

The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies

Early Results from GLASS-JWST. XXIII. The Transmission of Lyα from UV-faint z ∼ 3–6 Galaxies

Revealing the cosmic reionisation history with fast radio bursts in the era of Square Kilometre Array

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