Kato, Y., Miyoshi, M., Takahashi, R., Negoro, H., Matsumoto, R.
We determine the spin of a supermassive black hole in the context of discseismology by comparing newly detected quasi-periodic oscillations (QPOs) of radio emission in the Galactic centre,...
Optical and X-ray monitoring of the NLS1 galaxy Ark 564 (2003)
Brinkmann, W., Papadakis, I. E., Negoro, H., Detsis, E., Papamastorakis, I., Gliozzi, M., ...
Energy Spectra and Normalized Power Spectral Densities of X-Ray Nova GS 2000+25 (2002)
Terada, K., Kitamoto, S., Negoro, H., Iga, S.
The X-ray energy spectra and Normalized Power Spectral Densities (NPSDs) of an X-ray nova, GS 2000+25, were investigated. The X-ray energy spectra of the source consist of two components: a hard...
Prompted by recent discoveries of log-normal distributions in gamma-ray/X-ray temporal variabilities of gamma-ray bursts (GRBs) and blazars, we re-examine the X-ray variability of Cygnus X-1 in the...
On the Nature of X-ray Variability in Ark 564 (2002)
Gliozzi, M., Brinkmann, W., Raeth, C., Papadakis, I. E., Negoro, H., Scheingraber, H.
We use data from a recent long ASCA observation of the Narrow Line Seyfert 1 Ark 564 to investigate in detail its timing properties. We show that a thorough analysis of the time series, employing...
On the nature of X-ray variability in Ark 564 (2002)
Gliozzi, M., Brinkmann, W., Räth, C., Papadakis, I. E., Negoro, H., Scheingraber, H.
We use data from a recent long ASCA observation of the Narrow Line Seyfert 1 galaxy Ark 564 to investigate in detail its timing properties. We show that a thorough analysis of the time series,...
Detection of a high frequency break in the X-ray power spectrum of Ark 564 (2002)
Papadakis, I. E., Brinkmann, W., Negoro, H., Gliozzi, M.
We present a power spectrum analysis of the long ASCA observation of Ark 564 in June/July 2001. The observed power spectrum covers a frequency range of similar to 3.5 decades. We detect a high...
M. Gliozzi, W. Brinkmann, C. Räth, I. E. Papadakis, H. Negoro, H. Scheingraber
Abstract. We use data from a recent long ASCA observation of the Narrow Line Seyfert 1 galaxy Ark 564 to investigate in detail its timing properties. We show that a thorough analysis of the time...
Detection of a high frequency break in the X-ray power spectrum of Ark 564 (2001)
Papadakis, I. E., Brinkmann, W., Negoro, H., Gliozzi, M.
We present a power spectrum analysis of the long ASCA observation of Ark 564 in June/July 2001. The observed power spectrum covers a frequency range of ~ 3.5 decades. We detect a high frequency break...
Shemmer, O., Romano, P., Bertram, R., Brinkmann, W., Collier, S., Crowley, K. A., ...
We present the results of a 2 yr long optical monitoring program of the narrow-line Seyfert 1 galaxy Ark 564. The majority of this monitoring project was also covered by X-ray observations (RXT E),...
Sakano, M., Tomida, H., Matsuoka, M., Ueno, S., Komatsu, S., Shirasaki, Y., ...
Monitor of All-sky X-ray Image (MAXI) on the International Space Station (ISS) has two kinds of X-ray detectors: the Gas Slit Camera (GSC) and the Solid-state Slit Camera (SSC). SSC is an X-ray CCD...
Shemmer, O., Romano, P., Bertram, R., Brinkmann, W., Collier, S., Crowley, K. A., ...
We present the results of a two-year long optical monitoring program of the narrow-line Seyfert 1 galaxy Akn 564. The majority of this monitoring project was also covered by X-ray observations (RXTE)...
A Rapid X-ray Flare in the Radio-loud Narrow Line Quasar PKS 0558-504 (2001)
Wang, T. G., Matsuoka, M., Kubo, T., Mihara, T., Negoro, H.
We report the detection of a very short time scale flare in the radio-loud narrow line quasars PKS 0558-504 by using ASCA. The X-ray count rates increased and decreased by a factor of two in 33...
Optical and X-ray monitoring of the NLS1 galaxy Ark 564 (2000)
Papadakis, I. E., Brinkmann, W., Negoro, H., Detsis, E., Papamastorakis, I., Gliozzi, M.
The Narrow-line Seyfert galaxy Ark 564 was monitored between June 04, 2000 and June 24, 2000 from Skinakas Observatory. The B,V,R and I band light curves show night to night variations of 0.1 mag....
Contributions to the IAU Colloquium 177 and the conference on "X-ray astronomy 1999" (2000)
Nagase, F, Ueda, Y, Paul, B, Negoro, H, Sugizaki, M, Matsumoto, H, ...
MAXI mission for the space station (1999)
Matsuoka, M, Kawai, N, Mihara, T, Yoshida, A, Tsunemi, H, Miyata, E, ...
The X-ray CCD camera of the MAXI Experiment on the ISS/JEM (1999)
Miyata, E., Tsunemi, H., Ogata, H., Akutsu, D., Yoshita, K., Hashimoto, Y., ...
MAXI, Monitor of All-sky X-ray Image, is the X-ray observatory on the Japanese experimental module (JEM) Exposed Facility (EF) on the International Space Station (ISS). MAXI is a slit scanning camera...
Statistics Of Fluctuations In The Solar Soft X-Ray Emission (1997)
S. Ueno, S. Mineshige, H. Negoro, K. Shibata, H. S. Hudson
X-ray emission from the Sun uctuates as a result of occasional are events. We have calculated the power spectra of the solar soft X-ray variations using the photometric data of the GOES 6 satellite....
X-Ray Fluctuations from Locally Unstable Advection-Dominated Disks (1996)
Manmoto, T., Takeuchi, M., Mineshige, S., Matsumoto, R., Negoro, H.
The response of advection-dominated accretion disks to local disturbances is examined by one-dimensional numerical simulations. It is generally believed that advection-dominated disks are thermally...
Honda, K, Negoro, H, Dyball, R E, Higuchi, T, Takano, S
1. Experiments were undertaken to provide evidence for the existence of a circuit of neuronal interconnections between the supraoptic nucleus (SON), the ventral anteroventral third ventricular region...
Honda, K, Negoro, H, Dyball, R E, Higuchi, T, Takano, S
1. Experiments were undertaken to provide evidence for the existence of a circuit of neuronal interconnections between the supraoptic nucleus (SON), the ventral anteroventral third ventricular region...