Junichi Baba

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. 

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

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)

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. -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. -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

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

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

The Astronomical Society of Japan

International Astronomical Union