Kazuya Takahashi
Profile
Present Affiliation & Contact
 Research Center for the Early Universe (RESCEU), University of Tokyo
 kazuya.takahashi★resceu.s.utokyo.ac.jp (★ = at)
 kazuya.takahashi★yukawa.kyotou.ac.jp (★ = at)
Papers

Discovery of limbbrightening in the parsecscale jet of NGC 315 through global VLBI observations and its implications for jet models
J. Park et al. (including K. Takahashi as the 7th author; 2024), accepted for publication in The Astrophysical Journal Letters
[arXiv]

Gravitational wave physics and astronomy in the nascent era
M. Arimoto et al. (including K. Takahashi as one in the authors; 2023), Progress of Theoretical and Experimental Physics, 2023, 10A103
[arXiv]
[PTEP]
[ADS]

Probing particle acceleration at transrelativistic shocks with offaxis gammaray burst afterglows
K. Takahashi, K. Ioka, Y. Ohira & H. J. van Eerten (2022), Monthly Notices of the Royal Astronomical Society, 517, 5541
[arXiv]
[MNRAS]
[ADS]

Diverse jet structures consistent with the offaxis afterglow of GRB 170817A
K. Takahashi & K. Ioka (2021), Monthly Notices of the Royal Astronomical Society, 501, 5746
[arXiv]
[MNRAS]
[ADS]

Inverse reconstruction of jet structure from offaxis gammaray burst afterglows
K. Takahashi & K. Ioka (2020), Monthly Notices of the Royal Astronomical Society, 497, 1217
[arXiv]
[MNRAS]
[ADS]

A mechanism for tripleridge emission structure of AGN jets
T. Ogihara, K. Takahashi & K. Toma (2019), The Astrophysical Journal, 877, 19
[arXiv]
[ApJ]
[ADS]

Linear analysis of the shock instability in corecollapse supernovae: Influence of acoustic power and fluctuations of neutrino luminosity
K. Sugiura, K. Takahashi & S. Yamada (2019), The Astrophysical Journal, 874, 28
[arXiv]
[ApJ]
[ADS]

Parabolic jets from the spinning black hole in M87
M. Nakamura et al. (including K. Takahashi as the 10th author; 2018), The Astrophysical Journal, 868, 146
[arXiv]
[ApJ]
[ADS]

Fastspinning black holes inferred from symmetrically limbbrightened radio jets
K. Takahashi, K. Toma, M. Kino, M. Nakamura & K. Hada (2018), The Astrophysical Journal, 868, 82
[arXiv]
[ApJ]
[ADS]

On the importance of progenitor asymmetry to shock revival in corecollapse supernovae
H. Nagakura, K. Takahashi & Y. Yamamoto (2018), Monthly Notices of the Royal Astronomical Society, 483, 208
[arXiv]
[MNRAS]
[ADS]

Links between the shock instability in corecollapse supernovae and asymmetric accretions of envelopes
K. Takahashi, W. Iwakami, Y. Yamamoto & S. Yamada (2016), The Astrophysical Journal, 831, 75
[arXiv]
[ApJ]
[ADS]

Linear analysis on the growth of nonspherical perturbations in supersonic accretion flows
K. Takahashi & S. Yamada (2014), The Astrophysical Journal, 794, 162
[arXiv]
[ApJ]
[ADS]

Exact Riemann solver for ideal magnetohydrodynamics that can handle all types of intermediate shocks and switchon/off waves
K. Takahashi & S. Yamada (2014), Journal of Plasma Physics, volume 80, issue 02, pp. 255287
Selected as one of the Featured Articles of the journal (May 2015)
[arXiv]
[JPP]
[ADS]

Regular and nonregular solutions of the Riemann problem in ideal magnetohydrodynamics
K. Takahashi & S. Yamada (2013), Journal of Plasma Physics, volume 79, issue 03, pp. 335356
[arXiv]
[JPP]
[ADS]
International Conferences

Imaging jet structures with gammaray burst afterglows
K. Takahashi, K. Hotokezaka & K. Ioka, The 14th RESCEU International Symposium; From Large to Small Structures in the Universe, 30 Oct.2 Nov. 2023, Tokyo, Japan (Talk)

Probing particle acceleration at transrelativistic shocks with offaxis gammaray burst afterglows
K. Takahashi, K. Ioka, Y. Ohira & H. van Eerten, Symposium on gravitational wave physics and astronomy: Genesis, 2529 Apr. 2022, Kyoto, Japan (Talk)

Probing the particle acceleration at transrelativistic shocks with gammaray burst afterglows
K. Takahashi, K. Ioka, Y. Ohira & H. van Eerten, ICRC 2021, 1223 Jul. 2021, Berlin, Germany (Virtual) (Talk)

Diverse jet structures consistent with the offaxis afterglow of GRB 170817A
K. Takahashi & K. Ioka, The fourth annual area symposium online, 22 & 24 Feb. 2021, Online hosted by IPMU, U. Tokyo (Talk)

Diverse jet structures consistent with the offaxis afterglow of GRB 170817A
K. Takahashi & K. Ioka, Black Hole Astrophysics with VLBI: MultiWavelength Era, 18 Jan.  20 Jan. 2021, Online hosted by ICRR, U. Tokyo (Talk)

Inverse reconstruction of jet structure from offaxis gammaray burst afterglows
K. Takahashi & K. Ioka, The third annual symposium of the innovative area "Gravitational Wave Physics and Astronomy: Genesis" (Konangakuen 100th anniversary international scientific symposium series), 10 Feb.  12 Feb. 2020, Kobe, Japan (Talk)

Inverse reconstruction of jet structure from offaxis gammaray burst afterglows
K. Takahashi & K. Ioka, Yamada Conference LXXI: Gammaray Bursts in the Gravitationalwave Era 2019, 28 Oct.  1 Nov. 2019, Yokohama, Japan (Talk)

Inverse reconstruction of jet structure from offaxis gammaray burst afterglows
K. Takahashi & K. Ioka, YITP longterm workshop: MultiMessenger Astrophysics in the Gravitational Wave Era, 24 Sep.  25 Oct. 2019, Kyoto, Japan (Talk)

Inverse reconstruction of jet structure from offaxis gammaray burst afterglows
K. Takahashi & K. Ioka, Workshop to bring together experts on high energy astrophysics from Japan and Israel, 18 Jul.  23 Jul. 2019, RIKEN Wako/Kobe Campuses, Japan (Invited Talk)

Inverse problem of reconstructing the jet energy distribution from afterglow light curves
K. Takahashi & K. Ioka, The second annual symposium of the innovative area "Gravitational Wave Physics and Astronomy: Genesis", 26 Nov.  28 Nov. 2018, Kyoto, Japan (Talk)

Jet energy distribution inferred from afterglow light curves
K. Takahashi & K. Ioka, Jet and Shock Breakouts in Cosmic Transients, 14 May  18 May 2018, Kyoto, Japan (Invited Talk)

Parameter dependence of limbbrightening emission from AGN jets
K. Takahashi, K. Toma, M. Kino, M. Nakamura & K. Hada, Dawn of a new era for black hole jets in active galaxies, 25 Jan.  27 Jan. 2018, Sendai, Japan (Talk)

Radio emission from the relativistic jet of M87
K. Takahashi, K. Toma, M. Kino, M. Nakamura & K. Hada, Challenges of AGN Jets, 17 Jan.  20 Jan. 2017, Mitaka, Japan (Talk)

Links between the shock instabilities and asymmetric accretions of envelopes
K. Takahashi, W. Iwakami, Y. Yamamoto & S. Yamada, 2nd NAOJECT* Workshop on Many Riddles About CoreCollapse Supernovae: 1 Bethe and Beyond, 27 Jun.  1 Jul. 2016, Mitaka, Japan (Talk)

Links between fluid instability in a corecollapse supernova and fluctuations in a collapsing progenitor
K. Takahashi, W. Iwakami, Y. Yamamoto & S. Yamada, Bimonthly meeting: New development in astrophysics through multimessenger observations of gravitational wave sources, 26 Apr. 2016, Kyoto, Japan (Invited Talk)

Standing Accretion Shock Instability Revisited
K. Takahashi, Y. Yamamoto, W. Iwakami & S. Yamada, Numazu Workshop 2015: Challenges of modeling supernovae with nuclear data, 1 Sep.  4 Sep. 2015, Mishima, Japan (Poster)

Study on the growth and timevariability of fluctuations in supersonic flows: toward more realistic investigations on standing accretion shock instability
K. Takahashi & S. Yamada, MultiMessengers from CoreCollapse Supernovae (MMCOCOS), 2 Dec.  6 Dec. 2013, Fukuoka, Japan (Poster)

On the existence and nonuniqueness of solutions of Riemann problems in ideal magnetohydrodynamics
K. Takahashi & S. Yamada, ASTRONUM 2013 (8th International Conference on Numerical Modeling of Space Plasma Flows), 1 Jul.  5 Jul. 2013, Biarritz, France (Talk)
Lectures
 Fluid Dynamics I (language: Japanese), Konan University, Sep. 2021  Mar. 2022
 Fluid Dynamics I (language: Japanese), Konan University, Sep. 2020  Mar. 2021
 Fluid Mechanics (language: English), Waseda University, Oct. 2015  Mar. 2016
Public Outreach Activities

Ondemand Lecture on Gammaray Bursts, University of Tokyo Open Campus, Aug. 2022
[YouTube]
 Assistant of "the Black Hole Camera", Katahira Festival 2017  Open House of Tohoku University's Research Institutes and Center, 6 Oct.  7 Oct. 2017
 Poster Presenter for Astronomical Institute, Tohoku University Open Campus, 25 Sep.  26 Sep. 2017
 Poster Presenter for Astronomical Institute, Tohoku University Open Campus, 27 Sep.  28 Sep. 2016
Links