181 citations · 1.3k across the 60 of their papers we have counts for
62 papers
Magnetic Reconnection in Galaxy Clusters
Takuya Akahori, Kohei Kurahara, Shin-ya Nitta +4
Galaxy clusters contain an intra-cluster medium (ICM) with temperatures of tens of millions of Kelvin. Cosmological structure formation simulations show that this diffuse gas is he…
Detection of a bright burst from the repeating FRB 20201124A at 2 GHz
Sota Ikebe, Kazuhiro Takefuji, Toshio Terasawa +14
We present a detection of a bright burst from FRB 20201124A, which is one of the most active repeating FRBs, based on S-band observations with the 64-m radio telescope at the Usuda…
XMM-Newton view of the shock heating in an early merging cluster, CIZA J1358.94750
Y. Omiya, K. Nakazawa, K. Matsushita +10
CIZA J1358.9-4750 is a nearby galaxy cluster in the early phase of a major merger. The two-dimensional temperature map using XMM-Newton EPIC-PN observation confirms the existence o…
Sciences with Thai National Radio Telescope
Phrudth Jaroenjittichai, Koichiro Sugiyama, Busaba H. Kramer +44
This White Paper summarises potential key science topics to be achieved with Thai National Radio Telescope (TNRT). The commissioning phase has started in mid 2022. The key science…
Galaxy clusters at z~1 imaged by ALMA with the Sunyaev-Zel'dovich effect
T. Kitayama, S. Ueda, N. Okabe +15
We present high angular-resolution measurements of the thermal Sunyaev-Zel'dovich effect (SZE) toward two galaxy clusters, RCS J2319+0038 at z=0.9 and HSC J0947-0119 at z=1.1, by t…
On the Potential of Faraday Tomography to Identify Shock Structures in Supernova Remnants
Shinsuke Ideguchi, Tsuyoshi Inoue, Takuya Akahori +1
Knowledge about the magnetic fields in supernova remnants (SNRs) is of paramount importance for constraining Galactic cosmic ray acceleration models. It could also indirectly provi…
Diffuse radio source candidate in CIZA J1358.9-4750
Kohei Kurahara, Takuya Akahori, Ruta Kale +11
We report on results of our upgraded Giant Metrewave Radio Telescope (uGMRT) observations for an early-stage merging galaxy cluster, CIZA J1358.9-4750 (CIZA1359), in Band-3 (300--5…
Effects of Depolarizing Intervening Galaxies on Background Radio Emission I. Global Disk Magnetic Field
Rikuto Omae, Takuya Akahori, Mami Machida
External galaxies often intervene in front of background radio sources such as quasars and radio galaxies. Linear polarization of the background emission is depolarized by Faraday…
Wavelets and sparsity for Faraday tomography
Suchetha Cooray, Tsutomu T. Takeuchi, Shinsuke Ideguchi +3
Faraday tomography through broadband polarimetry can provide crucial information on magnetized astronomical objects, such as quasars, galaxies, or galaxy clusters. However, the lim…
Multi-frequency radio observations of the radio-loud magnetar XTE J1810-197
Sujin Eie, Toshio Terasawa, Takuya Akahori +11
We report on the multi-frequency multi-epoch radio observations of the magnetar, XTE J1810-197, which exhibited a radio outburst from December 2018 after its 10-year quiescent peri…
A month of monitoring the new magnetar Swift J1555.2-5402 during an X-ray outburst
Teruaki Enoto, Mason Ng, Chin-ping Hu +23
The soft gamma-ray repeater Swift J1555.2-5402 was discovered by means of a 12-ms duration short burst detected with Swift BAT on 2021 June 3. Then 1.6 hours after the first burst…
Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376
James O. Chibueze, Haruka Sakemi, Takumi Ohmura +7
Galaxy clusters are known to harbour magnetic fields. The nature of the intra-cluster magnetic fields remains an unresolved question. Intra-cluster magnetic field can be observed a…
An Iterative Reconstruction Algorithm for Faraday Tomography
Suchetha Cooray, Tsutomu T. Takeuchi, Takuya Akahori +4
Faraday tomography offers crucial information on the magnetized astronomical objects, such as quasars, galaxies, or galaxy clusters, by observing its magnetoionic media. The observ…
Magnetism Science with the Square Kilometre Array
George Heald, Sui Ann Mao, Valentina Vacca +41
The Square Kilometre Array (SKA) will answer fundamental questions about the origin, evolution, properties, and influence of magnetic fields throughout the Universe. Magnetic field…
ALMA Observations of PSR B1259-63/LS 2883 in an Inactive Period: Variable Circumstellar Disk?
Yutaka Fujita, Hiroshi Nagai. Takuya Akahori, Akiko Kawachi +1
We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of the gamma-ray binary system containing the pulsar PSR B1259-63 orbiting around a massive star LS 2883…
Discovery of Radio Jets in Phoenix Galaxy Cluster Center
Takuya Akahori, Tetsu Kitayama, Shutaro Ueda +6
We report the results of the Australia Telescope Compact Array (ATCA) 15 mm observation of the Phoenix galaxy cluster possessing an extreme star-burst brightest cluster galaxy (BCG…
Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect
T. Kitayama, S. Ueda, T. Akahori +7
We present measurements of the thermal Sunyaev-Zel'dovich effect (SZE) toward SPT-CL J2334-4243 (the Phoenix galaxy cluster) at z=0.597 by the Atacama Large Millimeter/submillimete…
Workshop summary 'The Power of Faraday Tomography'
Marijke Haverkorn, Mami Machida, Takuya Akahori
This article summarizes the work presented at the workshop 'The Power of Faraday Tomography: towards 3D mapping of cosmic magnetic fields', held in Miyazaki, Japan, in Spring 2018.…
First detection of PSR B1259-63/LS 2883 in the Millimeter and Submillimeter Wavelengths with ALMA
Yutaka Fujita, Akiko Kawachi, Takuya Akahori +2
We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of the binary system containing the pulsar PSR B1259-63 orbiting around a Be star LS 2883 after the 2017…
Faraday Tomography with Sparse Modeling
Kazunori Akiyama, Takuya Akahori, Yoshimitsu Miyashita +4
Faraday tomography (or rotation measure synthesis) is a procedure to convert linear polarization spectra into the Faraday dispersion function, which provides us with unique informa…
Radio broadband visualization of global three-dimensional magneto-hydrodynamical simulations of spiral galaxies II. Faraday Depolarization from 100MHz to 10GHz
Mami Machida, Takuya Akahori, Kenji Nakamura +2
Observational study of galactic magnetic fields is limited by projected observables. Comparison with numerical simulations is helpful to understand the real structures, and observa…
Radio broadband visualization of global three-dimensional magneto-hydrodynamical simulations of spiral galaxies I. Faraday rotation at 8GHz
Mami Machida, Takuya Akahori, Kenji Nakamura Hiroyuki Nakanishi +1
Observational study of galactic magnetic fields is hampered by the fact that the observables only probe various projections of the magnetic fields. Comparison with numerical simula…
Cool core disturbed: Observational evidence for coexistence of sub-sonic sloshing gas and stripped shock-heated gas around the core of RX J1347.5-1145
Shutaro Ueda, Tetsu Kitayama, Masamune Oguri +13
RXJ1347.5-1145 (z = 0.451) is one of the most luminous X-ray galaxy clusters, which hosts a prominent cool core and exhibits a signature of a major merger. We present the first dir…
Optimum Frequency of Faraday Tomography to Explore the Inter-Galactic Magnetic Field in Filaments of Galaxies
Takuya Akahori, Shinsuke Ideguchi, Takahiro Aoki +3
Faraday tomography is thought to be a powerful tool to explore cosmic magnetic field. Broadband radio polarimetric data is essential to ensure the quality of Faraday tomography, bu…