63 citations · 247 across the 11 of their papers we have counts for
11 papers
Evidence for planetary hypothesis for PTFO 8-8695b with five-year optical/infrared monitoring observations
Yuta Tanimoto, Takuya Yamashita, Takahiro Ui +16
PTFO 8-8695b (CVSO 30b) is a young planet candidate whose host star is a 2.6 Myr-old T-Tauri star, and there have been continuous discussions about the nature of this system…
Low-luminosity Type IIP Supernova 2016bkv with early-phase circumstellar interaction
Tatsuya Nakaoka, Koji S. Kawabata, Keiichi Maeda +22
We present optical and near-infrared observations of a low-luminosity Type IIP supernova (SN) 2016bkv from the initial rising phase to the plateau phase. Our observations show that…
No Ly emitters detected around a QSO at z=6.4: Suppressed by the QSO?
Tomotsugu Goto, Yousuke Utsumi, Satoshi Kikuta +3
Understanding how QSO's UV radiation affects galaxy formation is vital to our understanding of reionization era. Using a custom made narrow-band filter, , on Subaru/Suprime-…
Measurement of Interstellar Polarization and Estimation of Galactic Extinction for the Direction of X-ray Black Hole Binary V404 Cygni
Ryosuke Itoh, Yasuyuki T. Tanaka, Koji S. Kawabata +12
V404 Cygni is a well-known black hole binary candidate thought to have relativistic jets. It showed extreme outbursts on June 2015, characterized by a large amplitude and short tim…
Multiband optical variability of the blazar OJ 287 during its outbursts in 2015 -- 2016
Alok C. Gupta, A. Agarwal, A. Mishra +31
We present recent optical photometric observations of the blazar OJ 287 taken during September 2015 -- May 2016. Our intense observations of the blazar started in November 2015 and…
Systematic Study of Gamma-ray bright Blazars with Optical Polarization and Gamma-ray Variability
Ryosuke Itoh, Krzysztof Nalewajko, Yasushi Fukazawa +18
Blazars are highly variable active galactic nuclei which emit radiation at all wavelengths from radio to gamma-rays. Polarized radiation from blazars is one key piece of evidence f…
X-ray variability of GeV gamma-ray emitting radio galaxy NGC 1275
Yasushi Fukazawa, Kensei Shiki, Yasuyuki Tanaka +2
We analyzed Suzaku/XIS data of 2006--2015 observations of a gamma-ray emitting radio galaxy NGC 1275, and brightening of the nucleus in the X-ray band was found in 2013--2015, corr…
A significant hardening and rising shape detected in the MeV/GeV nuFnu spectrum from the recently-discovered very-high-energy blazar S4 0954+65 during the bright optical flare in 2015 February
Y. T. Tanaka, J. Becerra Gonzalez, R. Itoh +18
We report on Fermi Large Area Telescope (LAT) and multi-wavelength results on the recently-discovered very-high-energy (VHE, 100 GeV) blazar S4 0954+65 () during an e…
No Evidence of Intrinsic Optical/Near-Infrared Linear Polarization for V404 Cygni During its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters
Y. T. Tanaka, R. Itoh, M. Uemura +39
We present simultaneous optical and near-infrared (NIR) polarimetric results for the black hole binary V404 Cygni spanning the duration of its 7-day long optically-brightest phase…
Kanata optical and X-ray monitoring of Gamma-ray emitting Narrow-Line Seyfert 1 and Radio galaxies
Kenji Kawaguchi, Yasushi Fukazawa, Yasuyuki Tanaka +6
Broadband spectrum of AGN consists of multiple components such as jet emission and accretion disk emission. Temporal correlation study is useful to understand emission components a…
Suzaku X-Ray Monitoring of Gamma-Ray-Emitting Radio Galaxy, NGC 1275
Ikumi Edahiro, Yasushi Fukazawa, Kenji Kawaguchi +4
NGC 1275 is a gamma-ray-emitting radio galaxy at the center of the Perseus cluster. Its multi-wavelength spectrum is similar to that of blazers, and thus a jet-origin of gamma-ray…