37 Result(s)

Chapter and Conference Paper

Coordinated Optical-Exosat-Tenma Observations of a Burst from 2S1636-536

During a coordinated observations of 2S1636-536 with EXOSAT, Tenma and the 1.4 metre Danish telescope at La Silla, a single burst was detected at all three observatories. The burst was bright with a peak flux ...

M. J. L. Turner, L. M. Breedon, T. Ohashi… in X-Ray Astronomy in the Exosat Era (1985)

Article

Variations of the pulse profile and the X-ray intensity of GX301-2 (4U1223-62)

Two successive X-ray outbursts of the recurrent X-ray pulsar GX301-2 were observed in April and May, 1982 from Hakucho. Apart from general increase during flares lasting for several days, the X-ray intensity w...

K. Mitani, M. Matsuoka, K. Makishima, H. Inoue in Astrophysics and Space Science (1984)

Chapter and Conference Paper

Subpicosecond Accumulated Photon Echoes with Incoherent Light in Nd³⁺-Doped Silicate Glass

Since the first observation of accumulated photon echoes by HESSELINK and WIERSMA [1], nearly transform-limited mode-locked pulse trains have been used as the excitation source, and the resolution times have b...

H. Nakatsuka, S. Asaka, M. Fujiwara, M. Matsuoka in Ultrafast Phenomena IV (1984)

Article

Hard X-ray structure of the Crab Nebula

Two-dimensional maps of the Crab Nebula have been synthesized in 22–64 keV range through the modulation collimator experiment. The effective angular resolution is about 15″. The result indicates that the Crab ...

K. Makishima, Y. Ogawara, M. Matsuoka, M. Oda, S. Miyamoto… in Space Science Reviews (1981)

Chapter and Conference Paper

Hard X-Ray Structure of the Crab Nebula

Two-dimensional maps of the Crab Nebula have been synthesized in 22–64 keV range through the modulation collimator experiment. The effective angular resolution is about 15″. The result indicates that the Crab ...

K. Makishima, Y. Ogawara, M. Matsuoka, M. Oda, S. Miyamoto… in X-Ray Astronomy (1981)

Article

Backward echo and FID in two-level systems

Generation of backward photon echoes and proposed backward optical free induction decays is discussed in detail. Separation of the signals from excitation pulses by propagation and polarization directions sugg...

M. Matsuoka, H. Nakatsuka, M. Fujita in Applied physics (1980)

Chapter and Conference Paper

Picosecond Backward Echo in Sodium Vapor — Relaxation and Quantum Beat Modulation

The backward echo [1–3] is a three-pulse stimulated photon echo produced backward to either one or two of the excitation pulses kee** the phase matching conditions among the three excitation pulses and the e...

M. Matsuoka, H. Nakatsuka, M. Fujita in Picosecond Phenomena II (1980)

Article

The balloon observations of small cosmic X-ray bursts

In the record of the balloon observation which was performed on 27 September, 1970, a transient burst of X-rays was found. This event is concluded to be a cosmic gamma-ray burst of a smaller size or of a large...

Y. Ogawara, M. Matsuoka, S. Miyamoto, N. Muranaka… in Astrophysics and Space Science (1976)

Article

Size of the hard X-ray source in the Crab Nebula

The size of the hard X-ray source in the Crab Nebula was observed with scintillation counters on board two balloons at a lunar occulatation on 24 January, 1975. The Gaussian width of the source is 34″ (+17″, −...

Y. Fukada, S. Hayakawa, I. Kasahara, F. Makino, Y. Tanaka… in Astrophysics and Space Science (1976)

Article

Time variations of hard X-rays from Sco X-1

Simultaneous hard X-ray and optical observations of Sco X-1 were carried out on 1971 May 1 at Hyderabad, India, when Sco X-1 was optically bright. The X-ray intensity observed by balloon-borne counter telescop...

M. Matsuoka, M. Fujii, S. Miyamoto, J. Nishimura, M. Oda… in Astrophysics and Space Science (1972)

Article

Time variation of the X-ray spectrum and optical luminosity of SCO X-1

Results of rocket observations of SCO X-1 over the spectral range of 2∼20 keV are presented. The observations have been performed partly in India and partly in Japan under the collaboration of the three groups...

T. Kitamura, M. Matsuoka, S. Miyamoto, M. Nakagawa… in Astrophysics and Space Science (1971)

Article

Observation of cosmic soft X-rays

Cosmic soft X-rays in the energy range between 0.14 and 7 keV were observed with thin polypropylene window proportional counters on board a sounding rocket. The field of view crossed the galactic plane in the ...

S. Hayakawa, T. Kato, F. Makino, H. Ogawa, Y. Tanaka… in Astrophysics and Space Science (1971)

Article

The location and size of a solar hard X-ray burst on September 27, 1969

The location and size of a solar impulsive hard X-ray burst have been determined in one dimension to a considerable precision with a balloon-borne X-ray modulation collimator. The center of the X-ray source is...

T. Takakura, K. Ohki, N. Shibuya, M. Fujii, M. Matsuoka, S. Miyamoto… in Solar Physics (1971)

Chapter

Angular Size and Position of the X-ray Source Cyg-X-1

We performed a couple of balloon experiments to measure the size and the location of Cyg-X-1 using the techniques of the modulation collimator [1]. The angular periods of the modulation collimator were 26′ and...

M. Matsuoka, S. Miyamoto, J. Nishimura, M. Oda… in Non-Solar X- and Gamma-Ray Astronomy (1970)

Chapter

A Rocket Observation of Cosmic X-rays in the Energy Range between 0.15 and 20 keV

Cosmic X-rays were observed with three sets of proportional counters covering the energy range between 0.15 and 20 keV. The detector born on a spinning rocket scanned a celestial region in which the galactic l...

S. Hayakawa, T. Kato, F. Makino, H. Ogawa… in Non-Solar X- and Gamma-Ray Astronomy (1970)

Article

Measurement of the absolute intensity of cosmic X-rays

The intensity of the diffuse component of cosmic X-rays was measured with use of a rotating collimator system borne on a sounding rocket. A part of background counts proportional to the field of view of propor...

M. Matsuoka, M. Oda, Y. Ogawara, S. Hayakawa, T. Kato in Astrophysics and Space Science (1969)

Article

Galactic X-rays

S. Hayakawa, M. Matsuoka, D. Sugimoto in Space Science Reviews (1966)