CONSTRAINING WARM DARK MATTER MASS WITH COSMIC REIONIZATION AND GRAVITATIONAL WAVES

被引：7

作者：

Tan, Wei-Wei ^{[1
,2
]}

Wang, F. Y. ^{[1
,2
]}

Cheng, K. S. ^{[3
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China

[3] Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 829卷 / 01期

基金：

中国国家自然科学基金;

关键词：

cosmology: theory; dark ages; reionization; first stars; dark matter; gravitational waves; ALPHA ESCAPE FRACTION; STAR-FORMATION RATE; POPULATION-III; INTERGALACTIC MEDIUM; LUMINOSITY FUNCTION; STERILE NEUTRINOS; GALAXY PROPERTIES; STELLAR MASS; HALO MASS; REDSHIFT;

D O I：

10.3847/0004-637X/829/1/29

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We constrain the warm dark matter (WDM) particle mass with observations of cosmic reionization and CMB optical depth. We suggest that the gravitational waves (GWs) from stellar-mass black holes (BHs) could give a further constraint on WDM particle mass for future observations. The star formation rates (SFRs) of Population I/II (Pop I/II) and Population III (Pop III) stars are also derived. If the metallicity of the universe is enriched beyond the critical value of Z(crit) = 10(-3.5) Z(circle dot), the star formation shifts from Pop III to Pop I/II stars. Our results show that the SFRs are quite dependent on the WDM particle mass, especially at high redshifts. Combined with the reionization history and CMB optical depth derived from the recent Planck mission, we find that the current data require the WDM particle mass to be in a narrow range of 1 keV less than or similar to m(x) less than or similar to 3 keV. Furthermore, we suggest that the stochastic gravitational wave background (SGWB) produced by stellar BHs could give a further constraint on the WDM particle mass for future observations. For m(x) = 3 keV, with Salpeter (Chabrier) initial mass function (IMF), the SGWB from Pop I/II BHs has a peak amplitude of Omega(GW) approximate to 2.8 x 10(-9) (5.0 x 10(-9)) at f = 316Hz, while the GW radiation at f < 10 Hz is seriously suppressed. For m(x) = 1 keV, the SGWB peak amplitude is the same as that for m(x) = 1 keV, but a little lower at low frequencies. Therefore, it is hard to constrain the WDM particle mass by the SGWB from Pop I/II BHs. To assess the detectability of the GW signal, we also calculate the signal-to-noise ratios (S/N), which are S/N = 37.7(66.5) and 27 (47.7) for m(x) = 3 keV and m(x) = 1 keV for the Einstein Telescope with Salpeter (Chabrier) IMF, respectively. The SGWB from Pop III BHs is very dependent on the WDM particle mass, the GW strength could be an order of magnitude different, and the frequency band could be two times different for m(x) = 1 keV and m(x) = 3 keV. Moreover, the SGWB from Pop III BHs with m(x) = 1 keV could be detected by the Laser Interferometer Space Antenna for one year of observation, but it cannot be detected for those with m(x) = 3 keV.

引用

页数：10

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