Journal article

Detectability of the 21-cm signal during the epoch of reionization with 21-cm Lyman alpha emitter cross-correlation - I

Kenji Kubota, Shintaro Yoshiura, Keitaro Takahashi, Kenji Hasegawa, Hidenobu Yajima, Masami Ouchi, B Pindor, RL Webster



The detection of the redshifted 21-cm line signal from neutral hydrogen in the intergalactic medium during the epoch of reionization (EoR) is complicated by intense foregrounds such as galactic synchrotron and extragalactic radio galaxies. The 21-cm Lyman a emitter (LAE) crosscorrelation is one of the tools available to reduce foreground effects, because the foreground emission from such radio sources is statistically independent of LAE distribution. There are ongoing LAE surveys by the Subaru hyper suprime-cam (HSC) during the EoR at redshifts z = 6.6 and 7.3. Additionally, the prime focus spectrograph (PFS) will provide precise redshift information of the LAEs discovered by the HSC survey...

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Awarded by Ministry of Education, Culture, Sports, and Science and Technology (MEXT) of Japan

Awarded by KAKENHI through the JSPS

Awarded by CAASTRO (an Australian Research Council Centre of Excellence)

Funding Acknowledgements

We thank Tomoaki Ishiyama for providing us with the N-body simulation data used in this work. Numerical simulations were carried out on a CrayXC30 installed at the Center for Computational Astrophysics of National Astronomical Observatory of Japan (NAOJ). We thank Cathryn Trott for helpful comments that improved the paper. This work is supported by a Grand-in-Aid from the Ministry of Education, Culture, Sports, and Science and Technology (MEXT) of Japan, No. 26610048, No. 15H05896, No. 16H05999, No. 17H01110 (KT), No. 16J01585(SY), No. 17H04827(HY), Bilateral Joint Research Projects of the Japan Society for the Promotion of Science (JSPS; KT), a grant from NAOJ, a KAKENHI (15H02064) Grant-in-Aid for Scientific Research (A) through the JSPS, and CAASTRO (an Australian Research Council Centre of Excellence funded by grant CE110001020).