Zobrazeno 1 - 10
of 505
pro vyhledávání: '"Xu, Yidong"'
The 21-cm forest is a sensitive probe for the early heating process and small-scale structures during the epoch of reionization (EoR), to be realized with the upcoming Square Kilometre Array (SKA). Its detection relies on the availability of radio-br
Externí odkaz:
http://arxiv.org/abs/2407.18136
Autor:
Hu, Wenkai, Wang, Yougang, Li, Yichao, Pen, Ue-Li, Wang, Jie, Jing, Yingjie, Zhu, Ming, Zhang, Xin, Yang, Wenxiu, Xu, Yidong, Chen, Xu, Chen, Jingze, Zheng, Zheng, Li, Di, Chen, Xuelei
We present an extragalactic HI 21-cm absorption lines catalog from a blind search at z $\leq$ 0.35, using drift-scan data collected in 1616.9 hours by the ongoing Commensal Radio Astronomy FasT Survey (CRAFTS) and FAST All Sky HI Survey (FASHI), whic
Externí odkaz:
http://arxiv.org/abs/2407.14411
The hyperfine structure absorption lines of neutral hydrogen in spectra of high-redshift radio sources, known collectively as the 21-cm forest, have been demonstrated as a sensitive probe to the small-scale structures governed by the dark matter (DM)
Externí odkaz:
http://arxiv.org/abs/2407.14298
Autor:
Liu, Tianyang, Zhang, Jiajun, Shi, Yuan, Gu, Junhua, Guo, Quan, Xu, Yidong, Deng, Furen, Wu, Fengquan, Cong, Yanping, Chen, Xuelei
The cosmic 21 cm signal serves as a crucial probe for studying the evolutionary history of the Universe. However, detecting the 21 cm signal poses significant challenges due to its extremely faint nature. To mitigate the interference from the Earth's
Externí odkaz:
http://arxiv.org/abs/2406.17000
Autor:
Chen, Xuelei, Gao, Feng, Wu, Fengquan, Zhang, Yechi, Wang, Tong, Liu, Weilin, Zou, Dali, Deng, Furen, Gong, Yang, He, Kai, Li, Jixia, Sun, Shijie, Suo, Nanben, Wang, Yougang, Wu, Pengju, Xu, Jiaqin, Xu, Yidong, Yue, Bin, Zhang, Cong, Zhou, Jia, Zhou, Minquan, Zhu, Chenguang, Zhu, Jiacong
Publikováno v:
Phil. Trans. R. Soc. A.382,20230094(2024)
At the Royal Society meeting in 2023, we have mainly presented our lunar orbit array concept called DSL, and also briefly introduced a concept of a lunar surface array, LARAF. As the DSL concept had been presented before, in this article we introduce
Externí odkaz:
http://arxiv.org/abs/2403.16409
We investigate the feasibility of using the velocity acoustic oscillations (VAO) features on the Cosmic Dawn 21 cm power spectrum to probe small-scale density fluctuations. In the standard cold dark matter (CDM) model, Pop III stars form in minihalos
Externí odkaz:
http://arxiv.org/abs/2401.14234
Publikováno v:
Nature Astronomy 7, 1116-1126 (2023)
The absorption features in spectra of high-redshift background radio sources, caused by hyperfine structure lines of hydrogen atoms in the intervening structures, are known collectively as the 21-cm forest. They provide a unique probe of small-scale
Externí odkaz:
http://arxiv.org/abs/2307.04130
Autor:
Hu, Wenkai, Wang, Yougang, Li, Yichao, Xu, Yidong, Yang, Wenxiu, Lagache, Guilaine, Pen, Ue-Li, Zheng, Zheng, Shu, Shuanghao, Zheng, Yinghui, Li, Di, Ching, Tao-Chung, Chen, Xuelei
Publikováno v:
A&A 675, A40 (2023)
We present the early science results from a blind search of the extragalactic HI 21-cm absorption lines at z $\leqslant$ 0.09 with the drift-scan observation of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). We carried out the sear
Externí odkaz:
http://arxiv.org/abs/2305.02007