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12 papers · 2 filters
Cosmological constraint from QSO spatial power spectrum
Kazuhiro Yamamoto
In this paper we consider constraints on the cosmological density parameters from the spatial power spectrum of QSOs. We first review an analytic approach to the spatial power spec…
Feasibility of Probing Dark Energy with Strong Gravitational Lensing Systems -- Fisher-Matrix Approach --
Kazuhiro Yamamoto, Yasufum Kadoya, Tsukasa Murata +1
We assess the feasibility of probing dark energy with strong gravitational lensing systems. The capability of the method, which depends on the accuracy with which the lensing syste…
A Possible X-Ray Periodicity at Several Tens Hours of a Ultra-Luminous Compact X-Ray Source in IC 342
M. Sugiho, J. Kotoku, K. Makishima +4
A long (155 hours) ASCA observation was performed of two ultra luminous compact X-ray sources, Source 1 and Source 2, in the spiral galaxy IC 342. While Source 1 that was in a hard…
BeppoSAX Observation of the NGC 3079 Nucleus
Naoko Iyomoto, Yasushi Fukazawa, Naomasa Nakai +1
Using the BeppoSAX observatory, we have observed a nearby LINER/Seyfert 2 galaxy, NGC 3079, which is known as an outflow galaxy and a bright H_2O-maser source. Using the PDS detect…
Excess Hard X-ray Emission from the Obscured Low Luminosity AGN In the Nearby Galaxy M 51 (NGC 5194)
Yasushi Fukazawa, Naoko Iyomoto, Aya Kubota +2
We observed the nearby galaxy M~51 (NGC 5194) with BeppoSAX. The X-ray properties of the nucleus below 10 keV are almost the same as the ASCA results regarding the hard component a…
Stable Operation of a 300-m Laser Interferometer with Sufficient Sensitivity to Detect Gravitational-Wave Events within our Galaxy
Masaki Ando, the TAMA collaboration
TAMA300, an interferometric gravitational-wave detector with 300-m baseline length, has been developed and operated with sufficient sensitivity to detect gravitational-wave events…