Future galaxy redshift surveys generally plan to observe emission lines from star-forming galaxies to measure the three-dimensional galaxy clustering. One ongoing example is the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is designed to observe one million Lyman-α emitters (LAEs) over 1.9 < z < 3.5 in a unbiased way using the Integral Field Unit. However, such a unbiased nature of the HETDEX survey gives us an excellent opportunity. Namely, every 3D pixel in principle encodes the intensity of diffuse Lyman-α photons if exist. In this presentation, we discuss the feasibility of this so-called Lyman-α intensity mapping as a cosmological probe. We also introduce our simulation efforts in which the radiative transfer of Lyman-α photons are post processed in the Illustris simulation in order to have better understanding of the distribution of Lyman-α photons in the Universe.(If time and space is allowed, I will bring the poster on another topic as well.)
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 saito_poster_shanghai.pdf | 17.11 MB |