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Chapter
How to Search for Possible Bio-signatures on Earth-Like Planets: Beyond a Pale Blue Dot
The Earth viewed from outside the Solar System would be identified merely like a pale blue dot, as coined by Carl Sagan. In order to detect possible signatures of the presence of life on a second Earth among seve...
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Article
Open AccessMeasuring our Universe from Galaxy Redshift Surveys
Galaxy redshift surveys have achieved significant progress over the last couple of decades. Those surveys tell us in the most straightforward way what our local Universe looks like. While the galaxy distributi...
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Article
A gravitationally lensed quasar with quadruple images separated by 14.62 arcseconds
Gravitational lensing is a powerful tool for the study of the distribution of dark matter in the Universe. The cold-dark-matter model of the formation of large-scale structures (that is, clusters of galaxies a...
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Chapter
Superclustering of Galaxies Traced by a Group of QSOS at Z = 1.1
We present the result of a wide-area (48′ x 9′) imaging survey of faint galaxies toward the 1338+27 field where an unusual concentration of five QSOs at z ~ 1.1 is known to exist. We have detected a significant ...
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Chapter and Conference Paper
Constraints on the Matter Fluctuation Spectrum from X-Ray Luster Number Counts
We find that the observed log N-log S relation of X-ray clusters (Ebeling et al. 1997; Rosati et al. 1997) can be reproduced remarkably well with a certain range of values for the fluctuation amplitude σ8 and the...
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Chapter and Conference Paper
Clustering and Velocity Field of Galaxies in Cold Dark Matter Scenario
Cold dark matter (CDM) scenario with biased galaxy formation in an Einstein — de Sitter universe has been attracting much attention since it was reported to be successful in reproducing observations on various...
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Chapter and Conference Paper
Non-Gaussian Density Field in Nonlinear Gravitational Clustering
Nonlinear gravitational clustering is one of the most important and fundamental processes to link the theoretical models with the observed cosmic structures. In this talk, I address two aspects of the nonlinea...
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Article
Probes of large-scale structure in the Universe
Recent progress in observational techniques has made it possible to confront quantitatively various models for the large-scale structure of the Universe with detailed observational data. In particular, there ...
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Article
Free precession of Cyg X-3 and the 34.1-day periodicity
The origin of the 34.1-day periodicity in X-ray and γ-ray from Cyg X-3 has not been made clear so far. In this paper, we propose a free precession model for an elastic neutron star. This model explains the 34....
