902 citations · 3.2k across the 78 of their papers we have counts for
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The Fermi Bubbles as a Scaled-up Version of Supernova Remnants
Yutaka Fujita, Yutaka Ohira, Ryo Yamazaki
In this study, we treat the Fermi bubbles as a scaled-up version of supernova remnants (SNRs). The bubbles are created through activities of the super-massive black hole (SMBH) or…
The Cherenkov Telescope Array Large Size Telescope
G. Ambrosi, Y. Awane, H. Baba +129
The two arrays of the Very High Energy gamma-ray observatory Cherenkov Telescope Array (CTA) will include four Large Size Telescopes (LSTs) each with a 23 m diameter dish and 28 m…
Simulations of Collisionless Perpendicular Shocks in Partially Ionized Plasmas
Yutaka Ohira
Perpendicular collisionless shocks propagating into partially ionized plasmas are investigated by two-dimensional hybrid particle simulations. It is shown that some neutral particl…
Origin of Radially Aligned Magnetic Fields in Young Supernova Remnants
Tsuyoshi Inoue, Jiro Shimoda, Yutaka Ohira +1
It has been suggested by radio observations of polarized synchrotron emissions that downstream magnetic field in some young supernova remnants are oriented radially. We study magne…
Stability Analysis for Cosmic-Ray Heating of Cool Cores in Galaxy Clusters
Yutaka Fujita, Sota Kimura, Yutaka Ohira
We study the heating of the cool cores in galaxy clusters by cosmic-rays (CRs) accelerated by the central active galactic nuclei (AGNs). We especially focus on the stability of the…
Dynamics of X-Ray-Emitting Ejecta in the Oxygen-Rich Supernova Remnant Puppis A Revealed by the XMM-Newton RGS
Satoru Katsuda, Yutaka Ohira, Koji Mori +4
Using the unprecedented spectral resolution of the reflection grating spectrometer (RGS) onboard XMM-Newton, we reveal dynamics of X-ray--emitting ejecta in the oxygen-rich superno…
Entropy at the Outskirts of Galaxy Clusters as Implications for Cosmological Cosmic-Ray Acceleration
Yutaka Fujita, Yutaka Ohira, Ryo Yamazaki
Recently, gas entropy at the outskirts of galaxy clusters attracts much attention. We propose that the entropy profiles could be used to study cosmic-ray (CR) acceleration around t…
Turbulent Shear Acceleration
Yutaka Ohira
We consider particle acceleration by large-scale incompressible turbulence with a lengthscale larger than the particle mean free path. We derive an ensemble-averaged transport equa…
Synchrotron X-ray diagnostics of cutoff shape of nonthermal electron spectrum at young supernova remnants
Ryo Yamazaki, Yutaka Ohira, Makoto Sawada +1
Synchrotron X-rays can be a useful tool to investigate electron acceleration at young supernova remnants (SNRs). At present, since the magnetic field configuration around the shock…