22 citations · 54 across the 4 of their papers we have counts for
6 papers
Probing large scale filaments with HI and HeII
Yoshitaka Takeuchi, Saleem Zaroubi, Naoshi Sugiyama
We explore the observability of the neutral hydrogen (HI) and the singly-ionized isotope helium-3 (HeII) in the intergalactic medium (IGM) from the Epoch of Reionization down t…
Probing Quintessence Potential with Future Cosmological Surveys
Yoshitaka Takeuchi, Kiyotomo Ichiki, Tomo Takahashi +1
Quintessence, a scalar field model, has been proposed to account for the acceleration of the Universe at present. We discuss how accurately quintessence models are discriminated by…
Constraining isocurvature perturbations with the 21cm emission from minihaloes
Yoshitaka Takeuchi, Sirichai Chongchitnan
We investigate the effects of isocurvature perturbations on the 21cm radiation from minihaloes (MHs) at high redshifts and examine constraints on the isocurvature amplitude and pow…
OAO/ISLE Near-IR Spectroscopy of IRAS Galaxies
Y. Matsuoka, F. -T. Yuan, Y. Takeuchi +1
We present the results of the near-infrared (IR) spectroscopy of nine IRAS galaxies (NGC 1266, NGC 1320, NGC 2633, NGC 2903, NGC 3034, Mrk 33, NGC 7331, NGC 7625, NGC 7714) with th…
Application of cross correlations between CMB and large scale structure to constraints on the primordial non-Gaussianity
Yoshitaka Takeuchi, Kiyotomo Ichiki, Takahiko Matsubara
The primordial non-Gaussianity of local type affects the clustering of dark matter halos, and the planned deep and wide photometric surveys are suitable for examining this class of…
Constraints on primordial non-Gaussianity from Galaxy-CMB lensing cross-correlation
Yoshitaka Takeuchi, Kiyotomo Ichiki, Takahiko Matsubara
Recent studies have shown that the primordial non-Gaussianity affects clustering of dark matter halos through a scale-dependent bias and various constraints on the non-Gaussianity…