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Spectroscopy of the spatially-extended Lya emission around a QSO at z=6.4
Tomotsugu Goto, Yousuke Utsumi, Jeremy R. Walsh +3
We have taken a deep, moderate-resolution Keck/Deimos spectra of QSO, CFHQS2329, at z=6.4. At the wavelength of Lya, the spectrum shows a spatially-extended component, which is sig…
Discovery of a Dissociative Galaxy Cluster Merger with Large Physical Separation
William A. Dawson, David Wittman, Myungkook Jee +10
We present DLSCL J0916.2+2951 (z=0.53), a newly discovered major cluster merger in which the collisional cluster gas has become dissociated from the collisionless galaxies and dark…
A Gunn-Peterson test with a QSO at z=6.4
Tomotsugu Goto, Yousuke Utsumi, Takashi Hattori +2
Understanding the cosmic re-ionization is one of the key goals of the modern observational cosmology. High redshift QSO spectra can be used as background light sources to measure a…
Testing Weak Lensing Maps With Redshift Surveys: A Subaru Field
Michael J. Kurtz, Margaret J. Geller, Yousuke Utsumi +3
We use a dense redshift survey in the foreground of the Subaru GTO2deg^2 weak lensing field (centered at = 16; =43^\circ11^{\prime}24^{\prime\prime…