Dark-ages reionization and galaxy formation simulation XX. The Ly alpha IGM transmission properties and environment of bright galaxies during the epoch of reionization
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Dark-ages reionization and galaxy formation simulation XX. The Ly alpha IGM transmission properties and environment of bright galaxies during the epoch of reionization. / Qin, Yuxiang; Wyithe, J. Stuart B.; Oesch, Pascal A.; Illingworth, Garth D.; Leonova, Ecaterina; Mutch, Simon J.; Naidu, Rohan P.
I: Monthly Notices of the Royal Astronomical Society, Bind 510, Nr. 3, 12.01.2022, s. 3858-3866.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Dark-ages reionization and galaxy formation simulation XX. The Ly alpha IGM transmission properties and environment of bright galaxies during the epoch of reionization
AU - Qin, Yuxiang
AU - Wyithe, J. Stuart B.
AU - Oesch, Pascal A.
AU - Illingworth, Garth D.
AU - Leonova, Ecaterina
AU - Mutch, Simon J.
AU - Naidu, Rohan P.
PY - 2022/1/12
Y1 - 2022/1/12
N2 - The highly neutral intergalactic medium (IGM) during the epoch of reionization (EoR) is expected to suppress Ly alpha emission with damping-wing absorption, causing nearly no Ly alpha detection from star-forming galaxies at z similar to 8. However, spectroscopic observations of the four brightest galaxies (H-160 similar to 25 mag) at these redshifts do reveal prominent Ly alpha line, suggesting locally ionized IGM. In this paper, we explore the Ly alpha IGM transmission and environment of bright galaxies during the EoR using the Meraxes semi-analytic model. We find brighter galaxies to be less affected by damping-wing absorption as they are effective at ionizing surrounding neutral hydrogen. Specifically, the brightest sources (H-160 less than or similar to 25.5 mag) lie in the largest ionized regions in our simulation, and have low attenuation of their Ly alpha from the IGM (optical depth = 2-5 neighbours within 2 arcmin x 2 arcmin are similar to 2-3 times more likely to show Ly alpha emission. JWST will discover an order of magnitude more neighbours, revealing greater than or similar to 50 galaxies in the largest ionizing bubbles and facilitating direct study of reionization morphology.
AB - The highly neutral intergalactic medium (IGM) during the epoch of reionization (EoR) is expected to suppress Ly alpha emission with damping-wing absorption, causing nearly no Ly alpha detection from star-forming galaxies at z similar to 8. However, spectroscopic observations of the four brightest galaxies (H-160 similar to 25 mag) at these redshifts do reveal prominent Ly alpha line, suggesting locally ionized IGM. In this paper, we explore the Ly alpha IGM transmission and environment of bright galaxies during the EoR using the Meraxes semi-analytic model. We find brighter galaxies to be less affected by damping-wing absorption as they are effective at ionizing surrounding neutral hydrogen. Specifically, the brightest sources (H-160 less than or similar to 25.5 mag) lie in the largest ionized regions in our simulation, and have low attenuation of their Ly alpha from the IGM (optical depth = 2-5 neighbours within 2 arcmin x 2 arcmin are similar to 2-3 times more likely to show Ly alpha emission. JWST will discover an order of magnitude more neighbours, revealing greater than or similar to 50 galaxies in the largest ionizing bubbles and facilitating direct study of reionization morphology.
KW - cosmology: theory
KW - dark ages
KW - reionization
KW - first stars
KW - diffuse radiation
KW - early Universe
KW - galaxies: high-redshift
KW - intergalactic medium
KW - SIMILAR-TO 7
KW - EQUIVALENT-WIDTH DISTRIBUTION
KW - TEXAS SPECTROSCOPIC SEARCH
KW - UV LUMINOSITY FUNCTIONS
KW - LYMAN-ALPHA
KW - INTERGALACTIC MEDIUM
KW - COSMIC REIONIZATION
KW - ESCAPE FRACTION
KW - BACKGROUND FLUCTUATIONS
KW - OPACITY FLUCTUATIONS
U2 - 10.1093/mnras/stab3733
DO - 10.1093/mnras/stab3733
M3 - Journal article
VL - 510
SP - 3858
EP - 3866
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 303442582