12 citations · 64 across the 18 of their papers we have counts for
18 papers
Spatio-kinematical structure of the Galactic Nuclear Stellar Disk revealed in VLBI astrometry of circumstellar masers
Hiroshi Imai, Kohei Kurahara, Huib J. van Langevelde +2
SKA-VLBI astrometry will enable us to measure up to thousands of three dimensional motions of OH masers associated with circumstellar envelopes (CSEs) of OH/IR stars in the Nuclear…
Unravelling Turbulence and Magnetic Fields in Galaxy Clusters with SKA and XRISM
Kohei Kurahara, Takuya Akahori, Amit Seta +5
This chapter proposes a research framework to quantitatively investigate non-thermal components in the Intracluster Medium (ICM) of galaxy clusters, which are critical ingredients…
Probing Magnetic Fields In and Around Galaxies Near and Far
S. A. Mao, Rainer Beck, Aritra Basu +14
In order to understand the magnetization of galaxies and the role of magnetic fields in feedback processes that govern star formation and galaxy evolution, it is essential to have…
VLBI Astrometry of Magnetars
Takuya Akahori, Sujin Eie, Kei Amada +8
The origin of the strongest magnetic fields in the Universe, i.e., the origin of magnetars, is a longstanding question. An enhanced dynamo effect in an irregular supernova explosio…
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…
Constraints on the Physical Association between ICECAT1 Neutrinos and Fast Radio Bursts Using the Second CHIME/FRB Catalogue
Hiroto Masaoka, Tetsuya Hashimoto, Shotaro Yamasaski +8
We present a search for neutrino counterparts to fast radio bursts (FRBs) using temporal and spatial cross-matching between the Second CHIME/FRB catalogue and the IceCube high-ener…
Origin and Evolution of the Structure in the Head-Tail Radio Galaxy of Abell 3322
Kohei Kurahara, Takuya Akahori, Takumi Ohmura +8
A head-tail galaxy is thought to be a radio galaxy with bent active galactic nuclei (AGN) jets interacting with the intracluster medium (ICM). Study of head-tail galaxies provides…
Indications of an offset merger in Abell 3667
Y. Omiya, K. Nakazawa, T. Tamura +13
Abell 3667 is a nearby merging cluster with a prominent cold front and a pair of two bright radio relics. Assuming a head-on merger, the origin of the cold front is often considere…
Discovery of Diffuse Radio Source in Abell 1060
Kohei Kurahara, Takuya Akahori, Aika Oki +2
Non-thermal components in the intra-cluster medium (ICM) such as turbulence, magnetic field, and cosmic rays imprint the past and current energetic activities of jets from active g…
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…
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…
Physical properties of the molecular cloud, N4, in SS433; Evidence for an interaction of molecular cloud with the jet from SS433
Hiroaki Yamamoto, Ryuji Okamoto, Yasuhiro Murata +3
We conducted observations and analyses of the molecular cloud, N4, which is located at ~40 pc from SS433 and the same line of sight as that of the radio shell, in 12CO(J=1-0), 12CO…
VERA astrometry toward the Perseus arm gap
Nobuyuki Sakai, Hiroyuki Nakanishi, Kohei Kurahara +4
The Perseus arm has a gap in Galactic longitudes (l) between 50 and 80 deg (hereafter the Perseus arm gap) where the arm has little star formation activity. To better understand th…
Large-scale magnetic field structure of NGC 3627 based on magnetic vector map
Kohei Kurahara, Hiroyuki Nakanishi, Yuki Kudoh
We analyzed the data of Stokes , , and in C- and X-bands and investigated the large-scale magnetic field structure of NGC 3627. The polarization intensity and angle in ea…
Outer rotation curve of the Galaxy with VERA IV: Astrometry of IRAS 01123+6430 and the possibility of cloud-cloud collision
Nagito Koide, Hiroyuki Nakanishi, Nobuyuki Sakai +13
As part our investigation into the Galactic rotation curve, we carried out Very Long Baseline Interferometry (VLBI) observations towards the star-forming region IRAS 01123+6430 usi…
Magnetic Field Vector Structure of NGC6946
Kohei Kurahara, Hiroyuki Nakanishi
We studied large-scale magnetic field reversals of a galaxy based on a magnetic vector map of NGC6946. The magnetic vector map was constructed based on the polarization maps in the…
Magnetic field vector maps of nearby spiral galaxies
Hiroyuki Nakanishi, Kohei Kurahara, Kenta Anraku
We present a method for determining directions of magnetic field vectors in a spiral galaxy using two synchrotron polarization maps, an optical image, and a velocity field. The ori…
Magnetic Field Analysis of the Bow and Terminal Shock of the SS433 Jet
Haruka Sakemi, Mami Machida, Takuya Akahori +4
We report a polarization analysis of the eastern region of W50, observed with the Australia Telescope Compact Array (ATCA) at 1.4 - 3.0 GHz. In order to study the physical structur…