TY - JOUR
T1 - The host haloes of O i absorbers in the reionization epoch
AU - Finlator, Kristian Markwart
AU - Muñoz, Joseph A.
AU - Oppenheimer, B.D.
AU - Peng, Oh.S.
AU - Özel, Feryal
AU - Davé, Romeel
PY - 2013/12/1
Y1 - 2013/12/1
N2 - We use a radiation hydrodynamic simulation of the hydrogen reionization epoch to study OI absorbers at z ~ 6. The intergalactic medium (IGM) is reionized before it is enriched; hence, OI absorption originates within dark matter haloes. The predicted abundance of OI absorbers is in reasonable agreement with observations. Atz = 10, ≈70 per cent of sightlines through atomically cooled haloes encounter a visible (NOI > 1014cm-2) column. Reionization ionizes and removes gas from haloes less massive than 108.4M⊙, but 20 per cent of sightlines through more massive haloes encounter visible columns even at z = 5. The mass scale of absorber host haloes is 10-100 times smaller than the haloes of Lyman-break galaxies and Lyman α emitters, hence absorption probes the dominant ionizing sources more directly. OI absorbers have neutral hydrogen columns of 1019-1021 cm-2, suggesting a close resemblance between objects selected in OI and HI absorption. Finally, the absorption in the foreground of the z = 7.085 quasar ULAS J1120+0641 cannot originate in a dark matter halo because halo gas at the observed HI column density is enriched enough to violate the upper limits on the OI column. By contrast, gas at less than one-third the cosmic mean density satisfies the constraints. Hence, the foreground absorption likely originates in the IGM.
AB - We use a radiation hydrodynamic simulation of the hydrogen reionization epoch to study OI absorbers at z ~ 6. The intergalactic medium (IGM) is reionized before it is enriched; hence, OI absorption originates within dark matter haloes. The predicted abundance of OI absorbers is in reasonable agreement with observations. Atz = 10, ≈70 per cent of sightlines through atomically cooled haloes encounter a visible (NOI > 1014cm-2) column. Reionization ionizes and removes gas from haloes less massive than 108.4M⊙, but 20 per cent of sightlines through more massive haloes encounter visible columns even at z = 5. The mass scale of absorber host haloes is 10-100 times smaller than the haloes of Lyman-break galaxies and Lyman α emitters, hence absorption probes the dominant ionizing sources more directly. OI absorbers have neutral hydrogen columns of 1019-1021 cm-2, suggesting a close resemblance between objects selected in OI and HI absorption. Finally, the absorption in the foreground of the z = 7.085 quasar ULAS J1120+0641 cannot originate in a dark matter halo because halo gas at the observed HI column density is enriched enough to violate the upper limits on the OI column. By contrast, gas at less than one-third the cosmic mean density satisfies the constraints. Hence, the foreground absorption likely originates in the IGM.
U2 - 10.1093/mnras/stt1697
DO - 10.1093/mnras/stt1697
M3 - Journal article
SN - 0035-8711
VL - 436
SP - 1818
EP - 1835
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
IS - 2
ER -