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Aug 25, 2010

Fermi-LAT Study of Gamma-ray Emission in the Direction of Supernova …

We present an analysis of the gamma-ray data obtained with the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the directio…
May 02, 2017

New X-ray bound on density of primordial black holes

We set a new upper limit on the abundance of primordial black holes (PBH) based on existing X-ray data. PBH interactions with interstellar medium sho…
Sep 07, 2015

Suzaku observations of a shock front tracing the western edge of the …

We present the results of new Suzaku observations of the Coma Cluster, the X-ray brightest, nearby, merging system hosting a well studied, typical gi…
Feb 20, 2011
Atmospheric and Oceanic Physics
Geophysics

Long-duration gamma-ray emissions from 2007 and 2008 winter thunder…

The Gamma-Ray Observation of Winter THunderclouds (GROWTH) experiment, consisting of two radiation-detection subsystems, has been operating since 200…
Nov 16, 2017
Instrumentation and Detectors
Atomic Physic

A compact imaging system with a CdTe double-sided strip detector for …

A CdTe double-sided strip detector (CdTe-DSD) is an ideal device for imaging and spectroscopic measure- ments in the hard X-ray range above 10 keV. R…
Apr 30, 2018

X-ray short-time lags in the Fe-K energy band produced by scattering …

X-rays illuminating the accretion disc in active galactic nuclei give rise to an iron K line and its associated reflection spectrum which are lagged …
Nov 01, 2017

Atmospheric gas dynamics in the Perseus cluster observed with Hitomi

Extending the earlier measurements reported in Hitomi collaboration (2016, Nature, 535, 117), we examine the atmospheric gas motions within the centr…
Apr 01, 2011

Gamma Ray Signal from the Pulsar Wind in the Binary Pulsar system PSR…

Binary pulsar systems emit potentially detectable components of gamma ray emission due to Comptonization of the optical radiation of the companion st…
Dec 26, 2009

Suzaku X-Ray Imaging and Spectroscopy of Cassiopeia A

Suzaku X-ray observations of a young supernova remnant, Cassiopeia A, were carried out. K-shell transition lines from highly ionized ions of various …
Sep 22, 2011

Search for Gamma-ray Emission from X-ray Selected Seyfert Galaxies wi…

We report on a systematic investigation of the gamma-ray properties of 120 hard X-ray-selected Seyfert galaxies classified as `radio-quiet' objects, …
Jul 18, 2013

Active Galaxies Studied with the H.E.S.S. Observatory

X-ray selected BL Lac objects dominate the population of extragalactic sources detected in the very high energy (VHE; photon energies >100GeV) gamma-…
Aug 21, 2010

First Very Low Frequency detection of short repeated bursts from ma…

We report on the first detection of ionospheric disturbances caused by short repeated gamma-ray bursts from the magnetar SGR J1550-5418. Very low fre…
Sep 05, 2018

Suzaku and NuSTAR X-Ray Spectroscopy of gamma Cas and HD110432

Gamma Cas and its dozen analogs comprise a small but distinct class of X-ray sources. They are early Be-type stars with an exceptionally hard thermal…
May 08, 2012

Broad-band spectral analysis of the Galactic Ridge X-ray Emission

Detailed spectral analysis of the Galactic X-ray background emission, or the Galactic Ridge X-ray Emission (GRXE), is presented. To study the origin …
Oct 17, 2008

The classical nova V458 Vul was discovered on 2007 August 8. In response to the Swift detection of X-ray emission on day 70, we conducted a target of opportunity observation on day 88 with Suzaku.

X-Ray Spectroscopy of the Classical Nova V458 Vulpeculae with Suzaku

We conducted a target of opportunity X-ray observation of the classical nova V458 Vulpeculae 88 days after the explosion using the Suzaku satellite. …
Mar 24, 2011

Astrophysical parameters of LS2883 and implications for the PSR B1259…

Only a few binary systems with compact objects display TeV emission. The physical properties of the companion stars represent basic input to understa…
Jul 01, 2017

Search for Thermal X-ray Features from the Crab nebula with Hitomi So…

The Crab nebula originated from a core-collapse supernova (SN) explosion observed in 1054 A.D. When viewed as a supernova remnant (SNR), it has an an…
Jul 01, 2014

Reverse and Forward Shock X-ray Emission in an Evolutionary Model of …

We present new models for the forward and reverse shock thermal X-ray emission from core-collapse and Type Ia supernova remnants (SNRs) which include…
Apr 11, 2015

A Search for a keV Signature of Radiatively Decaying Dark Matter with…

We performed the deepest search for an X-ray emission line between 0.5 and 7 keV from non-baryonic dark matter with the Suzaku XIS. Dark matter assoc…
Sep 18, 2015

Fine-pitch semiconductor detector for the FOXSI mission

The Focusing Optics X-ray Solar Imager (FOXSI) is a NASA sounding rocket mission which will study particle acceleration and coronal heating on the Su…
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