Summary

I'm currently a postdoctoral researcher at Earth-Life Science Institute (ELSI), Tokyo Institute of Technology (Tokyo, Japan). I gained my undergraduate, master, and Ph.D. degrees at Tohoku University under the supervisors of Masafumi Noguchi and Keiichi Wada. I investigated the structures (bars and spirals) and dynamics of disk galaxies using large-scale N-body/hydrodynamic simulations taken into account self-gravity, radiative cooling/heating, star formation from cold, dense gas, supernova feedback. At present, I investigate the formation and evolution of disk galaxies (especially, z<~2) by using N-body/hydrodynamic simulations, semi-analytic models, and observational data. 

Recearch Interests

Structures and Dynamics of the Milky Way Galaxy

    • Dynamics of Spiral Arms in the Milky Way Galaxy (Baba et al. 2009)
    • Spiral Structures and l-v Features of the Milky Way Galaxy (Baba et al. 2010)

Dynamics of Spiral Structure in Disk Galaxies (review paper Dobbs & Baba 2014)

    • Stellar Dynamics of Non-Steady Spiral Arms in Disk Galaxies (Fujii, Baba et al. 2011; Baba et al. 2013, Baba 2015)
    • Interplay between Non-Steady Spiral Arms and ISM (Wada, Baba, & Saitoh 2011)

Dynamics of the ISM and Formation of Star Clusters in Disk Galaxies

    • Dynamical Evolution of Star Clusters in Spiral Galaxies (Fujii & Baba 2012)
    • Formation and Evolution of GMCs in Spiral Galaxies (Baba et al., submitted 2015b)

Formation and Evolution of Disk Galaxies

    • Evolution of cold gas in galaxies at z<2 (Morokuma-Matsui, Baba et al. 2015; Morokuma-Matsui & Baba 2015)
    • Dynamical Evolution of High-z Disk Galaxies

Research Skills

Skills

Numerical Simulations

N-body simulations of disk galaxies/SPH simulations of galactic-scale hydrodynamics including radiative cooling, self-gravity, star formation, feedback (HII regions, SN explosions), non-equilibrium chemical reactions

High Performance Computing

C, Fortran, MPI

Publications

Review Papers

  1. Dobbs, C. L., & Baba, J.,: "Dawes Review 4: Spiral Structures in Disk Galaxies", PASA, Volume 31, id.e035 40 pp.

Refereed Papers (First Author)

  1. J. Baba, Y. Asaki, J. Makino, M. Miyoshi, T.R. Saitoh, & K. Wada, “The Origin of Large Peculiar Motions of Star-Forming Regions and Spiral Structures of Our Galaxy,” The Astrophysical Journal, Volume 706, Issue 1, pp. 471-481 (2009)
  2. J. Baba, T.R. Saitoh, & K. Wada, “On the Interpretation of the l-v Features in the Milky Way Galaxy,” Publi- cations of the Astronomical Society of Japan, Volume 62, No. 6, pp. 1413-1422 (2010)
  3. J. Baba, T.R. Saitoh, & K. Wada, “Dynamics of Non-Steady Spiral Arms in Disk Galaxies,” The Astrophysical Journal, Volume 763, Issue 1, pp. 46-59 (2013)
  4. J. Baba, K. Morokuma-Matsui, & F. Egusa: “Radial distributions of arm-gas offsets as an observational test of spiral theories,” Publications of the Astronomical Society of Japan, Volume 67, Issue 4, pp. L45-49 (2015)
  5. J. Baba: “Short-term dynamical evolution of grand-design spirals in barred galaxies,” Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 3, pp. 2954-2964, (2015)

Refereed Papers (Co-Author)

  1. M. S. Fujii, J. Baba, T.R. Saitoh, J. Makino, E. Kokubo, & K. Wada, “The Dynamics of Spiral Arms in Pure Stellar Disks,” The Astrophysical Journal, Volume 730, Issue 2, pp. 109-123 (2011)
  2. K. Wada, J. Baba, & T.R. Saitoh, “Interplay between Stellar Spirals and the ISM in Galactic Disks,” The Astrophysical Journal, Volume 735, Issue 1, pp. 1-10 (2011)
  3. M. S. Fujii & J. Baba, “Destruction of star clusters due to the radial migration in spiral galaxies,” Monthly Notices of the Royal Astronomical Society: Letters, Volume 427, Issue 1, pp. L16-L20 (2012)
  4. T.R. Saitoh, J. Makino, Y. Asaki, J. Baba, S. Komugi, M. Miyoshi, T. Nagao, M. Takahashi, T. Takeda, M. Tsuboi, & K. Wakamatsu, “Flaring up of the Compact Cloud G2 during the Close Encounter with Sgr A* in Summer 2013,” Publications of the Astronomical Society of Japan, Volume 66, Issue 1, pp. 1-9 (2014)
  5. A. Hirota, N. Kuno, J. Baba, F. Egusa, A. Habe, K. Muraoka, A. Tanaka, H. Nakanishi, & R. Kawabe, “Wide- Field 12CO (J = 1-0) Imaging of the Nearby Barred Galaxy M 83 with NMA and Nobeyema 45-m Telescope: Molecular Gas Kinematics and Star Formation along the Bar,” Publications of the Astronomical Society of Japan, Volume 66, Issue 2, pp. 46-67 (2014)
  6. N. Matsunaga, K. Fukue, R. Yamamoto, N. Kobayashi, L. Inno, K. Genovali, G. Bono, J. Baba, M.S. Fujii, S. Kondo, Y. Ikeda, S. Hamano, S. Nishiyama, T. Nagata, W. Aoki, & T. Tujimoto, “Kinematics of Classical Cepheids in the Nuclear Stellar Disk,” The Astrophysical Journal, Volume 799, Issue 1, pp. 46-54 (2015)
  7. K. Morokuma-Matsui, J. Baba, K. Sorai, & N. Kuno, “CO emissions from optically selected galaxies at z ∼ 0.1–0.2: Tight anti-correlation between molecular gas fraction and 4000 ̊A break strength,” Publications of the Astronomical Society of Japan, Volume 67, Issue 3, pp. 36-48, (2015)
  8. K. Morokuma-Matsui & J. Baba, “Redshift evolution of stellar mass versus gas fraction relation in 0 < z < 2 regime: an observational constraint for galaxy formation models,” Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 4, pp. 3792-3804 (2015)

Proceedings

  1. K. Wada, J. Baba, M. Fujii, & T.R. Saitoh, “Galactic scale star-formation,” International Astronomical Union Sym- posium, Volume 270, pp. 363-370 (2010)
  2. M. S. Fujii, J. Baba, T.R. Saitoh, J. Makino, E. Kokubo, K. Wada, “The dynamics of long-lived spiral arms,” EPJ Web of Conferences, Volume 19, id.07009, (2012)
  3. K. Matsui, K. Sorai, J. Baba, Y. Watanabe, & N. Kuno, “High Gas Fraction of Barred Spiral Galaxies at z ∼ 0.1-0.2,” ASP Conference Series, Volume 476, p. 277 (2013)
  4. J. Baba, K. Morokuma-Matsui, & T.R. Saitoh, “The Structure and Kinematics of the ISM in Simulated Star-forming Galaxies,” International Astronomical Union Symposium, Volume 309, p. 299 (2015)
  5. K. Morokuma-Matsui, J. Baba, K. Sorai, & N. Kuno, “Gas accretion history of galaxies at z ∼ 0 – 2: Comparison of the observational data of molecular gas with the mass evolution model of galaxies,” International Astronomical Union Symposium, Volume 309, p. 332 (2015)
  6. Fujii, M.S. & J. Baba: “Dynamical evolution of star clusters in transient spiral arms,” Highlights of Astronomy, Volume 16, pp. 359-359 (2015)

Presentations

International

  1. [Invited] Junichi Baba et al.:"Dynamics of Spiral Structures in Disk Galaxies", The 6th East-Asian Numerical Astrophysics Meeting, September 15-19, 2014, Suwon, Korea
  2. Junichi Baba, K. Morokuma-Matsui, & T.R Saitoh:"The Structure and Kinematics of the ISM in Simulated Star-Forming Galaxies at z=0 and z~2", Revolution in Astronomy with ALMA - The 3rd Year, December 8-11, 2014, Tokyo, Japan, Poster
  3. Junichi Baba, K. Morokuma-Matsui, & T.R Saitoh:"The Structure and Kinematics of the ISM of Star-Forming Galaxies", International Astronomical Union Symposium 309: GALAXIES IN 3D ACROSSTHE UNIVERSE, July 7-11, 2014, Vienna, Austria, Poster

Japanese

  1. Many presentations

Postdoctral Fellowships

Work History
Apr 2013 - Present

Research Scientist

Earth-Life Science Institute, Tokyo Institute of Technology

Implementation of non-equilibrium chemical reactions and cooling/heating processes in the ISM into ASURA code

Large-scale N-body/SPH simulations on dynamics of stars and the ISM in Milky Way-like barred galaxies

Feb 2012 - Mar 2013

Project Resaerch Associate

Intreactive Research Center of Science, Tokyo Institute of Technology

Implementation of far-UV dependent cooling/heating and formation of molecular hydrogen into ASURA code

Dynamics of stellar spiral arms in disk galaxies

Aug 2011 - Jan 2012

Postdoctral Fellow

Intreactive Research Center of Science, Tokyo Institute of Technology

Dynamics of stellar spiral arms in disk galaxies

Interplay between stellar spiral arms and the ISM in disk galaxies

Apr 2009 - Jul 2011

Postdoctoral Fellow

Center for Computational Astrophysics, National Astronomical Observatory of Japan

N-body/SPH simulations of spiral galaxies

User supports of high performance computers in CfCA/NAOJ

Academic Qualifications

Education
Apr 2005 - Mar 2009

Doctor of Science in Astrophysics

TOHOKU UNIVERSITY, Sendai, Miyagi

Large-scale N-body/SPH simulations of spiral galaxies

The Nature of Spiral Arms in Disk Galaxies (supervisor Prof. Keiichi Wada)

Apr 2003 - Mar 2005

Master of Science in Astrophysics

TOHOKU UNIVERSITY, Sendai, Miyagi

N-body/SPH simulations of collapsing protogalactic clouds

Formation of bars in cosmologically predicted dark matter haloes (supervisor Prof. Masafumi Noguchi)

Apr 1999 - Mar 2003

Bachelor of Science in Astrophysics

TOHOKU UNIVERSITY, Sendai, Miyagi

Develpvent of an astronomical CCD camera cooled via liquid-nitrogen (supervior Prof. Takashi Ichikawa)

Academic and Related Experiences

Part-time Teacher

    • Quantum Mechanics (for 3rd grade students), Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2012-2013
    • Galactic Astronomy (for 3rd grade students), Faculty of Education, Bunkyo University,  2010-2011
    • Introduction to Astronomy (for 1st grade students), Faculty of Education, Bunkyo University,  2010-2011
    • Introduction to Astronomy (for 1st grade students), Faculty of Engineering, Kanagawa University,  2010

Refereeing

    • Publications for Astronomical Society of Japan (PASJ)
    • Monthly Notices of the Royal Astronomical Society (MNRAS)
    • New Astronomy
    • Observational Proposals for Telescopes (radio, optical)

SOC/LOC

    • Milky Way Workshop, March 23--24, 2015, Tokyo, Japan
    • ALMA Large Proposal International Workshop (nearby galaxies), August 24--25, 2015, Tokyo, Japan
    • ALMA Large Proposal International Workshop (mid-z galaxies), December 1--3, 2015, Tokyo, Japan

Research Grants

Revealing formation processes of disk galaxies at high redshifts. JSPS Grant-in-Aid for Young Scientists (B), 2014-present

Professional Memberships/Affiliations

The Astronomical Society of Japan

International Astronomical Union

Simulation Movies