KN
Kotaro Niinuma
astro-ph.HEastro-ph.GAastro-ph.IMastro-ph.SRastro-ph.COgr-qchep-phphysics.flu-dynphysics.plasm-ph
On Valency
published · living versionsW_zj5juagt·v1 · currentpublished
The Black Hole Explorer: Motivation and Vision
with Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin, Bryan Bilyeu +63
1 version
Preprints & journals
48 papers in the corpus · 2010–2026Resolving Nearby Supermassive Black Holes with the Black Hole Explorer2608.16983v1 · Yuto Akiyama, Kazunori Akiyama, Dominic W. Pesce et al.2026 · 0 citationsPubl. Astron. Soc. Pac. 138, 094102 (2026)
Radio Constraints on the Circumstellar Environment of the Type IIb Supernova SN 2024iss2608.06716v1 · Yuhei Iwata, Tomoki Matsuoka, Masanori Akimoto et al.2026 · 0 citationsarXiv
Black Hole Explorer Mission Development in Japan2608.00890v1 · Kazunori Akiyama, Mareki Honma, Akihiro Doi et al.2026 · 0 citationsSPIE Astronomical Telescopes + Instrumentation, 2026
VLBI Astrometry of Magnetars2606.29671v1 · Takuya Akahori, Sujin Eie, Kei Amada et al.2026 · 0 citationsarXiv
VLBI-Enabled Localization of Continuous GW Sources2606.28721v1 · Keitaro Takahashi, Takuya Akahori, Kenta Fujisawa et al.2026 · 0 citationsarXiv
Fast variability and circular polarization of the 6.7 GHz methanol maser in G33.641$-$0.2282601.20371v2 · Kenta Fujisawa, Yui Sugiura, Yuta Kojima et al.2026 · 0 citationsarXiv
A Possible Shutting-Down Event of Mass Accretion in An Active Galactic Nucleus at z~1.82510.12122v1 · Tomoki Morokuma, Malte Schramm, Toshihiro Kawaguchi et al.2025 · 1 citationarXiv
Radio Follow-up Observations of SN 2023ixf by Japanese and Korean VLBIs2411.07542v1 · Yuhei Iwata, Masanori Akimoto, Tomoki Matsuoka et al.2024 · 1 citationarXiv
Black Hole Spacetime and Properties of Accretion Flows and Jets Probed by Black Hole Explorer: Science Cases Proposed by BHEX Japan Team2406.09995v1 · Tomohisa Kawashima, Yuh Tsunetoe, Ken Ohsuga et al.2024 · 2 citationsarXiv
The Japanese Vision for the Black Hole Explorer Mission2406.09516v1 · Kazunori Akiyama, Kotaro Niinuma, Kazuhiro Hada et al.2024 · 5 citationsProc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130922E, 2024 August 23
The Black Hole Explorer: Motivation and Vision2406.12917v1 · Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin et al.2024 · 91 citationsProceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130922D (2024)on Valency
Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode2404.17623v3 · J. C. Algaba, M. Balokovic, S. Chandra et al.2024 · 35 citationsA&A 692, A140 (2024)
Precessing jet nozzle connecting to a spinning black hole in M87.37758892 · Cui, Yuzhu, Hada, Kazuhiro, Kawashima, Tomohisa et al.2023 · 113 citationsNature. 2023;621(7980):711-715
Very Long Baseline Interferometry imaging of H2O maser emission in the nearby radio galaxy NGC 42612304.13245v1 · Satoko Sawada-Satoh, Nozomu Kawakatu, Kotaro Niinuma et al.2023 · 2 citationsarXiv
The Past and Future of East Asia to Italy: Nearly Global VLBI2303.14518v1 · Gabriele Giovannini, Yuzhu Cui, Kazuhiro Hada et al.2023 · 4 citationsGalaxies 2023 11(2) 49
Spectral analysis of a parsec-scale jet in M87: Observational constraint on the magnetic field strengths in the jet2303.01014v1 · Hyunwook Ro, Motoki Kino, Bong Won Sohn et al.2023 · 25 citationsA&A 673, A159 (2023)
Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)2212.07040v1 · Kazunori Akiyama, Juan-Carlos Algaba, Tao An et al.2022 · 16 citationsGalaxies 2022, 10(6), 113
Detection of a bright burst from the repeating FRB 20201124A at 2 GHz2211.13835v1 · Sota Ikebe, Kazuhiro Takefuji, Toshio Terasawa et al.2022 · 10 citationsarXiv
The intrinsic structure of Sagittarius A* at 1.3 cm and 7 mm2112.04929v1 · Ilje Cho, Guang-Yao Zhao, Tomohisa Kawashima et al.2021 · 27 citationsarXiv
Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 20202111.12926v1 · V. A. Acciari, S. Ansoldi, L. A. Antonelli et al.2021 · 9 citationsarXiv
Morphological transition of the compact radio lobe in 3C84 via the strong jet-cloud collision2110.11082v1 · Motoki Kino, Kotaro Niinuma, Nozomu Kawakatu et al.2021 · 34 citationsarXiv
A VLA Survey of Late-time Radio Emission from Superluminous Supernovae and the Host Galaxies2108.10445v1 · Bunyo Hatsukade, Nozomu Tominaga, Tomoki Morokuma et al.2021 · 5 citationsarXiv
East Asian VLBI Network Observations of Active Galactic Nuclei Jets: Imaging with KaVA+Tianma+Nanshan2104.05525v3 · Yuzhu Cui, Kazuhiro Hada, Motoki Kino et al.2021 · 18 citationsarXiv
Variability of Late-time Radio Emission in SLSN PTF10hgi2103.09374v1 · Bunyo Hatsukade, Nozomu Tominaga, Tomoki Morokuma et al.2021 · 12 citationsarXiv
Millimeter-VLBI Detection and Imaging of the Gravitationally Lensed Gamma-Ray Blazar JVAS B0218+3572009.00780v1 · Kazuhiro Hada, Kotaro Niinuma, Julian Sitarek et al.2020 · 0 citationsarXiv
Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array1904.02894v1 · Taeseok Lee, Sascha Trippe, Motoki Kino et al.2019 · 19 citationsarXiv
Source-Frequency Phase-Referencing Observation of AGNs with KaVA Using Simultaneous Dual-Frequency Receiving1903.11796v1 · Guang-Yao Zhao, Taehyun Jung, Bong Won Sohn et al.2019 · 12 citationsJKAS, 2019, 52, 23
Parabolic Jets from the Spinning Black Hole in M871810.09963v1 · Masanori Nakamura, Keiichi Asada, Kazuhiro Hada et al.2018 · 169 citationsarXiv
Evidence of jet-clump interaction: a flip of the radio jet head of 3C~841808.08855v1 · M. Kino, K. Wajima, N. Kawakatu et al.2018 · 28 citationsarXiv
Obscured Star Formation in the Host Galaxies of Superluminous Supernovae1803.02185v1 · B. Hatsukade, N. Tominaga, M. Hayashi et al.2018 · 20 citationsarXiv
Mid-infrared excess from the west hot spot of the radio galaxy Pictor A unveiled by WISE1710.08221v1 · Naoki Isobe, Shoko Koyama, Motoki Kino et al.2017 · 14 citationsarXiv
A Face-on Accretion System in High-Mass Star-Formation: Possible Dusty Infall Streams within 100 AU1710.05371v1 · Kazuhito Motogi, Tomoya Hirota, Kazuo Sorai et al.2017 · 13 citationsarXiv
White Paper on East Asian Vision for mm/submm VLBI: Toward Black Hole Astrophysics down to Angular Resolution of 1~R1705.04776v1 · K. Asada, M. Kino, M. Honma et al.2017 · 11 citationsarXiv
Radio Astrometry towards the Nearby Universe with the SKA1603.02042v1 · Hiroshi Imai, Ross A. Burns, Yoshiyuki Yamada et al.2016 · 3 citationsarXiv
Discovery of off-axis jet structure of TeV blazar Mrk 501 with mm-VLBI1601.02497v1 · S. Koyama, M. Kino, M. Giroletti et al.2016 · 13 citationsarXiv
Discovery of a wandering radio jet base after a large X-ray flare in the blazar Markarian 4211507.04082v1 · K. Niinuma, M. Kino, A. Doi et al.2015 · 15 citationsarXiv
The off-axis jet structure in Mrk 501 at mm-wavelengths1505.04433v1 · Shoko Koyama, Motoki Kino, Marcello Giroletti et al.2015 · 1 citationarXiv
A strong radio brightening at the jet base of M87 in the period of the elevated TeV gamma-ray state in 20121502.05177v1 · K. Hada, M. Giroletti, M. Kino et al.2015 · 2 citationsarXiv
Accelerating a water maser face-on jet from a high mass young stellar object1502.00376v2 · Kazuhito Motogi, Kazuo Sorai, Mareki Honma et al.2015 · 18 citationsarXiv
A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 20121412.6861v1 · K. Hada, M. Giroletti, M. Kino et al.2014 · 0 citationsarXiv
VLBI observations of bright AGN jets with KVN and VERA Array (KaVA): Evaluation of Imaging Capability1406.4356v1 · Kotaro Niinuma, Sang-Sung Lee, Motoki Kino et al.2014 · 58 citationsarXiv
Rotating and infalling motion around the high-mass young stellar object Cepheus A-HW2 observed with the methanol maser at 6.7 GHz1312.7235v1 · K. Sugiyama, K. Fujisawa, A. Doi et al.2013 · 34 citationsarXiv
Observations of 6.7 GHz Methanol Masers with EAVN I: VLBI Images of the first Epoch of Observations1311.3431v1 · Kenta Fujisawa, Koichiro Sugiyama, Kazuhito Motogi et al.2013 · 46 citationsarXiv
X-ray and Radio Follow-up Observations of High-Redshift Blazar Candidates in the Fermi-LAT Unassociated Source Population1306.3552v2 · Y. Takahashi, J. Kataoka, K. Niinuma et al.2013 · 9 citationsarXiv
Radio and gamma-ray follow-up of the exceptionally high activity state of PKS 1510-089 in 20111210.4319v1 · M. Orienti, S. Koyama, F. D'Ammando et al.2012 · 64 citationsarXiv
Intermittent maser flare around the high mass young stellar object G353.273+0.641 II: Detection of a radio and molecular jet1209.4313v1 · Kazuhito Motogi, Kazuo Sorai, Kotaro Niinuma et al.2012 · 13 citationsarXiv
Possible Detection of Apparent Superluminal inward motion in Markarian 421 after the Giant X-ray flare in February, 20101209.2466v1 · K. Niinuma, M. Kino, H. Nagai et al.2012 · 15 citationsarXiv
Astrometry of HO masers in the massive star--forming region IRAS 06061+2151 with VERA1009.5890v1 · Kotaro Niinuma, Takumi Nagayama, Tomoya Hirota (1 et al.2010 · 38 citationsarXiv
Career total: 137 works. 48 are in this corpus.
Profile built from the corpus for this byline.
Author records are still filling in while the Hub is in alpha. If this is your page, you'll be able to claim it soon. Spot a mistake? Tell us.