Publications (12)
Long-duration gamma-ray emissions from 2007 and 2008 winter thunderstorms
H. Tsuchiya, T. Enoto, S. Yamada +8
The Gamma-Ray Observation of Winter THunderclouds (GROWTH) experiment, consisting of two radiation-detection subsystems, has been operating since 2006 on the premises of Kashiwazak…
ASTRO-H White Paper - Accreting Pulsars, Magnetars, and Related Sources
S. Kitamoto, T. Enoto, S. Safi-Harb +18
As the endpoints of massive star evolution, neutron stars are enigmatic celestial objects characterized by extremely dense and exotic nuclear matter, magnetospheres with positrons…
Detection of high-energy gamma rays from winter thunderclouds
H. Tsuchiya, T. Enoto, S. Yamada +8
A report is made on a comprehensive observation of a burst-like -ray emission from thunderclouds on the Sea of Japan, during strong thunderstorms on 2007 January 6. The detecte…
In-Orbit Performance of the Hard X-ray Detector on board Suzaku
M. Kokubun, K. Makishima, T. Takahashi +52
The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide ener…
Hardening and termination of long-duration gamma rays detected prior to lightning
H. Tsuchiya, T. Enoto, K. Iwata +10
We report the first observation of 330 MeV prolonged gamma-ray emission that was abruptly terminated by lightning. The gamma-ray detection was made during winter thunderstorms o…
A novel Kagome uud-ddu spin order in Heisenberg spin-1/2 Clinoatacamite Cu(OH)Cl, the parent compound of Herbertsmithite
X. G. Zheng, M. Hagihala, I. Yamauchi +4
The newly identified field-induced up-up-down order in BaCoSbO etc. renewed attention on exotic phases in spin-1/2 triangular-lattice antiferromagnets. Here, we report…
ASTRO-H White Paper - Plasma Diagnostic and Dynamics of the Galactic Center Region
K. Koyama, J. Kataoka, M. Nobukawa +16
The most characteristic high-energy phenomena in the Galactic center (GC) region is the presence of strong K-shell emission lines from highly ionized Si, S, Ar, Ca, Fe and Ni, whic…
Nuclear structure of 30S and its implications for nucleosynthesis in classical novae
K. Setoodehnia, A. A. Chen, D. Kahl +29
The uncertainty in the 29P(p,gamma)30S reaction rate over the temperature range of 0.1 - 1.3 GK was previously determined to span ~4 orders of magnitude due to the uncertain locati…
Observation of an energetic radiation burst from mountain-top thunderclouds
H. Tsuchiya, T. Enoto, T. Torii +9
During thunderstorms on 2008 September 20, a simultaneous detection of gamma rays and electrons was made at a mountain observatory in Japan located 2770 m above sea level. Both emi…
ASTRO-H White Paper - White Dwarf
K. Mukai, T. Yuasa, A. Harayama +5
Interacting binaries in which a white dwarf accretes material from a companion --- cataclysmic variables (CVs) in which the mass loss is via Roche-lobe overflow, and symbiotic star…
Fermi-LAT and Suzaku Observations of the Radio Galaxy Centaurus B
J. Katsuta, Y. T. Tanaka, L. Stawarz +8
Centaurus B is a nearby radio galaxy positioned in the Southern hemisphere close to the Galactic plane. Here we present a detailed analysis of about 43 months of accumulated Fermi-…
Broad-Band Spectrum of The Black Hole Candidate IGR J17497-2821 Studied with Suzaku
A. Paizis, K. Ebisawa, H. Takahashi +9
The broad-band 1-300 keV Suzaku spectrum of IGR J17497-2821, the X-ray transient discovered by INTEGRAL in September 2006, is presented. Suzaku observed IGR J17497-2821 on Septembe…