We summarize several measurements of the dark matter temperature-to-mass ratio, or equivalently, of the comoving root-mean-square thermal velocity of warm dark matter particles vhrms(1). The most reliable determinatio...
supported by the National Key R&D Program of China No.2018YFE0120800;the National Natural Science Foundation of China grant No.11973047;the National Key R&D Program of China No.2022YFF0504300;the National SKA Program of China Nos.2020SKA0110401,and 2020SKA0110402。
Observations are beginning to constrain the history of the epoch of reionization(EoR).Modeling the reionization process is indispensable to interpret the observations,to infer the properties of ionizing sources,and to...
The root-mean-square of non-relativistic warm dark matter particle velocities scales as vhrms(a)=vhrms(1)/a , where a is the expansion parameter of the universe. This velocity dispersion results ...
supported by the National SKA Program of China(Grant No.2020SKA0110401);NSFC(Grant Nos.12103044,11821303 and 11850410429);National Key R&D Program of China(Grant No.2018YFA0404502);supported in part by grants from Yunnan University。
The bubble size distribution of ionized hydrogen regions probes information about the morphology of HⅡbubbles during reionization.Conventionally,the HⅡbubble size distribution can be derived from the tomographic ima...
supported by the Key Projects of Frontier Science of Chinese Academy of Sciences(Grant No.QYZDY-SSW-SLH022);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB23000000);the National Key R&D Program of China(Grant No.2018YFA0404601)。
We present a conceptual design study of external calibrators in the 21 cm experiment towards detecting the globally averaged radiation of the epoch of reionization(EoR).Employment of external calibrator instead of int...
supported by the National Key R&D Program of China(No.2017YFB0203300);and the Key Program of the National Natural Science Foundation of China(NFSC,Grant No.11733010);W.S.Z.acknowledges support from the NSFC(Grant No.11673077);F.L.L.is supported by the NSFC(Grant No.11333008);the State Key Development Program for Basic Research of China(2015CB857000)。
The thermal history of cosmic gas in the dark ages remains largely unknown.It is important to quantify the impact of relevant physics on the IGM temperature between z=10 and z^30,in order to interpret recent and oncom...
Theory and observations concerning the cosmic reionization epoch are briefly discussed in the context of recent observations attributed to dark matter. A case is made that cold ground state interstellar atomic hydroge...
supported by the Ministry of Science and Technology(2016YFE0100300);the National Natural Science Foundation of China(Grant Nos.11473044,U1501501,U1631118 and 11633004);the Chinese Academy of Sciences(QYZDJ-SSW-SLH017);support by the CSC Cai Yuanpei grant
Extracting the neutral hydrogen (HI) signal is a great challenge for cosmological 21 cm experiments; both the astrophysical foregrounds and receiver noise are typically several orders of magnitude greater than the 2...
The data presented herein were obtained at NOAO’s Cerro Tololo Interamerican Observatory, which is operated by AURA for the U.S. National Science Foundation;Funding for the DES Projects has been provided by the DOE and NSF (USA), MISE (Spain), STFC (UK), HEFCE (UK)
The Epoch of Reionization(EoR)poses a number of puzzles,including the sufficiency of ionizing radiation,the rapid production of supermassive black holes and the early appearance of abundant metals in larger galaxies.F...
supported by the National Natural Science Foundation of China(Grant Nos.11473031,11261140641 and 11173028);the 973 Program(Grant No.2013CB837900)
The cross-correlation between the high-redshift 21 cm background and the Soft X-ray Background (SXB) of the Universe may provide an additional probe of the Epoch of Reionization. Here we use semi-numerical simulatio...