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Turbulent Cosmic Ray Reacceleration at Radio Relics and Halos in Clusters of Galaxies
Yutaka Fujita, Motokazu Takizawa, Ryo Yamazaki +2
Radio relics are synchrotron emission found on the periphery of galaxy clusters. From the position and the morphology, it is often believed that the relics are generated by cosmic-…
Suzaku observation of a high entropy cluster Abell 548W
Kazuhiro Nakazawa, Yuichi Kato, Liyi Gu +4
Abell 548W, one of the galaxy clusters located in the Abell 548 region, has about an order of magnitude lower X-ray luminosity compared to ordinal clusters in view of the well know…
The young radio lobe of 3C 84: inferred gas properties in the central 10 parsec
Yutaka Fujita, Nozomu Kawakatu, Isaac Shlosman +1
We analyse the environment of the supermassive black hole (SMBH) in the centre of a massive elliptical galaxy NGC 1275 in the Perseus cluster, hosting the radio source 3C 84. We fo…
Radio Relics Tracing the Projected Mass Distribution in CIZA J2242.8+5301
Nobuhiro Okabe, Hiroki Akamatsu, Jun Kakuwa +4
We present a weak-lensing analysis for the merging galaxy cluster, CIZA J2242.8+5301, hosting double radio relics, using three-band Subaru/Suprime-Cam imaging (). Since the…
Hadronic origin of multi-TeV gamma rays and neutrinos from low-luminosity active galactic nuclei: implications of past activities of the Galactic center
Yutaka Fujita, Shigeo S. Kimura, Kohta Murase
Radiatively inefficient accretion flows (RIAFs) in low-luminosity active galactic nuclei (LLAGNs) have been suggested as cosmic-ray and neutrino sources that may largely contribute…
Can we explain AMS-02 antiproton and positron excesses simultaneously by nearby supernovae without pulsars nor dark matter?
Kazunori Kohri, Kunihito Ioka, Yutaka Fujita +1
We explain the excess of the antiproton fraction recently reported by the AMS-02 experiment by considering collisions between cosmic-ray protons accelerated by a local supernova re…