CONSTRAINTS ON IONIZING PHOTON PRODUCTION FROM THE LARGE-SCALE Lyα FOREST

被引:19
作者
Pontzen, Andrew [1 ]
Bird, Simeon [2 ]
Peiris, Hiranya [1 ]
Verde, Licia [3 ,4 ,5 ]
机构
[1] UCL, Dept Phys & Astron, London WC1E 6BT, England
[2] Inst Adv Study, Princeton, NJ 08540 USA
[3] Univ Barcelona, IEEC, Inst Ciencies Cosmos, ICREA, E-08028 Barcelona, Spain
[4] Univ Barcelona, IEEC, Inst Ciencies Cosmos, ICC, E-08028 Barcelona, Spain
[5] Univ Oslo, Inst Theoret Astrophys, N-0316 Oslo, Norway
基金
欧洲研究理事会; 美国国家科学基金会;
关键词
cosmology: observations; dark ages; reionization; first stars; large-scale structure of universe; POWER SPECTRUM; FLUCTUATIONS; DENSITY; FLUX;
D O I
10.1088/2041-8205/792/2/L34
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent work has shown that the z similar or equal to 2.5 Ly alpha forest on large scales encodes information about the galaxy and quasar populations that keep the intergalactic medium photoionized. We present the first forecasts for constraining the populations with data from current and next-generation surveys. At a minimum, the forest should tell us whether galaxies or, conversely, quasars dominate the photon production. The number density and clustering strength of the ionizing sources might be estimated to sub-10% precision with a DESI-like survey if degeneracies (e.g., with the photon mean-free-path, small-scale clustering power normalization, and potentially other astrophysical effects) can be broken by prior information. We demonstrate that when inhomogeneous ionization is correctly handled, constraints on dark energy do not degrade.
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页数:5
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