683 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Tohoku UniversityJP202 papers
- The University of TokyoJP78 papers
- Kyoto UniversityJP59 papers
- National Astronomical Observatory of JapanJP44 papers
- Kavli Institute for the Physics and Mathematics of the UniverseJP40 papers
- Nagoya UniversityJP33 papers
- The University of OsakaJP32 papers
- Massachusetts Institute of TechnologyUS30 papers
- Institute of Space and Astronautical ScienceJP27 papers
- Japan Aerospace Exploration AgencyJP26 papers
- Ehime UniversityJP24 papers
- Institute of Astronomy and Astrophysics, Academia SinicaTW24 papers
36 papers · 1 filter
Molecular-Cloud-Scale Chemical Composition III: Constraints of Average Physical Properties through Chemical Models
Nanase Harada, Yuri Nishimura, Yoshimasa Watanabe +4
It is important to understand the origin of molecular line intensities and chemical composition in the molecular-cloud scale in the Galactic sources because it serves as a benchmar…
On Lorentz-invariant spin-2 theories
Atsushi Naruko, Rampei Kimura, Daisuke Yamauchi
We construct Lorentz-invariant massless/massive spin-2 theories in flat spacetime. Starting from the most generic action of a rank-2 symmetric tensor field whose Lagrangian contain…
Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within years
Kohei Ichikawa, Junko Ueda, Hyun-Jin Bae +4
Arp 187 is one of the fading active galactic nuclei (AGN), whose AGN activity is currently decreasing in luminosity. We investigate the observational signatures of AGN in Arp 187,…
BAT AGN Spectroscopic Survey - XI. The Covering Factor of Dust and Gas in Swift/BAT Active Galactic Nuclei
Kohei Ichikawa, Claudio Ricci, Yoshihiro Ueda +10
We quantify the luminosity contribution of active galactic nuclei (AGN) to the 12 m, mid-infrared (MIR; 5-38 m), and the total IR (5-1000 m) emission in the local AGN dete…
Hunting Axion Dark Matter with Protoplanetary Disk Polarimetry
Tomohiro Fujita, Ryo Tazaki, Kenji Toma
We find that the polarimetric observations of protoplanetary disks are useful to search for ultra-light axion dark matter. Axion dark matter predicts the rotation of the linear pol…
Parabolic Jets from the Spinning Black Hole in M87
Masanori Nakamura, Keiichi Asada, Kazuhiro Hada +18
The M87 jet is extensively examined by utilizing general relativistic magnetohydrodynamic (GRMHD) simulations as well as the steady axisymmetric force-free electrodynamic (FFE) sol…
Demonstration of displacement sensing of a mg-scale pendulum for mm- and mg- scale gravity measurements
Nobuyuki Matsumoto, Masakazu Sugawara, Seiya Suzuki +6
Gravity generated by large masses has been observed using a variety of probes from atomic interferometers to torsional balances. However, gravitational coupling between small masse…
Effect of the self-gravity of shells on a high energy collision in a rotating Bañados-Teitelboim-Zanelli spacetime
Kota Ogasawara, Naoki Tsukamoto
We consider a collision of two dust thin shells with a high center-of-mass (CM) energy including their self-gravity in a Bañados-Teitelboim-Zanelli (BTZ) spacetime. The shells divi…
Detection of polarized gamma-ray emission from the Crab nebula with Hitomi Soft Gamma-ray Detector
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +191
We present the results from the Hitomi Soft Gamma-ray Detector (SGD) observation of the Crab nebula. The main part of SGD is a Compton camera, which in addition to being a spectrom…
The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo
M. Bulla, S. Covino, K. Kyutoku +8
The Gravitational Wave (GW) event GW 170817 was generated by the coalescence of two neutron stars (NS) and produced an electromagnetic transient, labelled AT 2017gfo, that was targ…
Zodiacal Light Beyond Earth Orbit Observed with Pioneer 10
T. Matsumoto, K. Tsumura, Y. Matsuoka +1
We reanalyze the Imaging Photopolarimeter data from Pioneer 10 to study the zodiacal light in the B and R bands beyond Earth orbit, applying an improved method to subtract integrat…
Is the Infrared Background Excess Explained by the Isotropic Zodiacal Light from the Outer Solar System?
Kohji Tsumura
This paper investigates whether an isotropic zodiacal light from the outer Solar system can account for the detected background excess in near-infrared. Assuming that interplanetar…
Linear stability analysis of a rotating thin-shell wormhole
Naoki Tsukamoto, Takafumi Kokubu
We cut and paste two Banados-Teitelboim-Zanelli (BTZ) spacetimes at a throat by the Darmois-Israel method to construct a rotating wormhole with a thin shell filled with a barotropi…
Discovery of Kolmogorov-like Magnetic Energy Spectrum in Tycho's Supernova Remnant by Two-point Correlations of Synchrotron Intensity
Jiro Shimoda, Takuya Akahori, A. Lazarian +2
The spectral slope of the magnetic energy in supernova remnants (SNRs) can be obtained by analysis of spatial two-point correlation functions of synchrotron intensities. This metho…
A multiline study of a high-mass young stellar object in the Small Magellanic Cloud with ALMA: The detection of methanol gas at 0.2 solar metallicity
Takashi Shimonishi, Yoshimasa Watanabe, Yuri Nishimura +5
We report the results of subparsec-scale submillimeter observations towards an embedded high-mass young stellar object in the Small Magellanic Cloud (SMC) with ALMA. Complementary…
MIRIS observation of near-infrared diffuse Galactic light
Y. Onishi, K. Sano, S. Matsuura +17
We report near-infrared (IR) observations of high Galactic latitude clouds to investigate diffuse Galactic light (DGL), which is starlight scattered by interstellar dust grains. Th…
In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)
Kouichi Hagino, Kazuhiro Nakazawa, Goro Sato +37
The Hard X-ray Imager (HXI) onboard Hitomi (ASTRO-H) is an imaging spectrometer covering hard X-ray energies of 5-80 keV. Combined with the hard X-ray telescope, it enables imaging…
Confinement of the Crab Nebula with tangled magnetic field by its supernova remnant
Shuta J. Tanaka, Kenji Toma, Nozomu Tominaga
A pulsar wind is a relativistic outflow dominated by Poynting energy at its base. Based on the standard ideal magnetohydrodynamic (MHD) model of pulsar wind nebulae (PWNe) with the…
Stellar mass dependence of the 21-cm signal around the first star and its impact on the global signal
Toshiyuki Tanaka, Kenji Hasegawa, Hidenobu Yajima +2
The 21-cm signal in the vicinity of the first stars is expected to reflect properties of the first stars. In this study we pay special attention to tracing the time evolution of th…
Explaining changing-look AGN with state transition triggered by rapid mass accretion rate drop
Hirofumi Noda, Chris Done
We model the broadband (optical/UV and X-ray) continuum spectrum of the "changing-look" active galactic nucleus (AGN) Mrk 1018 as it fades from Seyfert 1 to 1.9 in years.…
Gravitational waves from supermassive black hole binaries in ultra-luminous infrared galaxies
Kohei Inayoshi, Kohei Ichikawa, Zoltan Haiman
Gravitational waves (GWs) in the nano-hertz band are great tools for understanding the cosmological evolution of supermassive black holes (SMBHs) in galactic nuclei. We consider SM…
Localized charge in various configurations of magnetic domain wall in Weyl semimetal
Yasufumi Araki, Akihide Yoshida, Kentaro Nomura
We numerically investigate the electronic properties of magnetic domain walls formed in a Weyl semimetal. Electric charge distribution is computed from the electron wave functions,…
Modeling of proton-induced radioactivation background in hard X-ray telescopes: Geant4-based simulation and its demonstration by Hitomi's measurement in a low Earth orbit
Hirokazu Odaka, Makoto Asai, Kouichi Hagino +47
Hard X-ray astronomical observatories in orbit suffer from a significant amount of background due to radioactivation induced by cosmic-ray protons and/or geomagnetically trapped pr…
The effects of anisotropy and non-adiabaticity on the evolution of comoving curvature perturbation
Atsushi Naruko, Antonio Enea Romano, Misao Sasaki +1
We derive the equation for the evolution of the curvature perturbation on the comoving time slice, , in the presence of anisotropic and non-adiabatic terms in the en…