Constraining warm dark matter with 21 cm line fluctuations due to minihalos
Constraining warm dark matter with 21 cm line fluctuations due to minihalos
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由于迷你晕,限制了具有 21 厘米线波动的暖暗物质
DOI:
10.1088/1475-7516/2014/08/007
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发表时间:
2014
影响因子:
6.4
通讯作者:
Hiroyuki Tashiro
中科院分区:
文献类型:
--
作者:
Toyokazu Sekiguchi;Hiroyuki Tashiro
Warm dark matter (WDM) with mass m WDM= Script O (1) keV has long been discussed as a promising solution for discrepancies between cosmic structures observed at small scales and predications of the concordance CDM model. Though several cosmological observations such as the Lyman-alpha forest have already begun to constrain the range of m WDM, WDM is yet to be fully excluded as a solution for these so-called small-scale problems. In this paper, we study 21 cm line fluctuations from minihalos in a WDM model and evaluate constraints on m WDM for future cosmological 21 cm surveys, such as SKA and FFTT. We show that, since WDM with mass m WDM≳ 10 keV decreases the abundance of minihalos by suppressing the matter power spectrum on small scales via free-streaming, such WDM can significantly affect the resultant 21 cm line fluctuations from minihalos. We find that if the 21 cm signal from minihalos can be observed above z≥ 5, SKA and FFTT can give lower bounds m WDM≳ 24 keV and 31 keV, respectively, which are tighter than the current constraint. These future 21 cm surveys might be able to rule out a WDM model as a solution of small-scale problems.
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DOI:
10.1086/309273
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2000
期刊:
The Astrophysical Journal
影响因子:
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影响因子:
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