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CHIAKI's Research

## RESEARCH INTERESTS ##

Publication List

  • BSc thesis "Metallicity Gradients of Elliptical Galaxies", 1997, Univ. of Tokyo
  • MSc thesis "Low-Metallicity Inhibition of Type Ia Supernovae and Galactic and Cosmic Chemical Evolution", 1999, Univ. of Tokyo
  • PhD thesis "Formation and Chemodynamical Evolution of Galaxies", 2002, Univ. of Tokyo

Works: Viewgraphs, Posters, Images, Animations...

Research Interests: Galaxy Formation and Evolution

  • Progenitors of Type Ia Supernovae (SNe Ia)
    • NOT the double-degenerate but the single-degenerate scenario, where the progenitor is a pair of white dwarf and normal star.
    • In terms of the evolution of the binary system, metallicity effect is important on the occurrence of SNe Ia (Kobayashi et al. 1998).
    • The observed scatter of the SNIa luminosity can be explained (Umeda et al. 1999).
    • The dust effect on the SNIa cosmology can be estimated (Totani & Kobayashi 1999).
    • The cosmic SN Ia rate will show a decrease from z~1.5 (Kobayashi et al. 98, 00)
    • The bimodarity in lifetime distribution has been prediced (Kobayashi & Nomoto 2008).
  • Galactic and Cosmic Chemical Evolution
    • Chemical abundances are fossils to tell us the star formation history of galaxies and the universe; Stars formed from gas clouds in a galaxy, eject heavy elements into the interstellar medium via supernovae. Different heavy elements are produced from different types of supernovae (SN Ia, II, and HN) with different timescales.
    • Computed with one zone-models, with which I can make a galaxy in 2 minutes:) (Kobayashi, Tsujimoto, Nomoto 00)
    • Computed with SPH simulations, which takes 2 weeks for a galaxy, 2 months for the Universe... (Kobayashi, Springel, White 06)
  • Spatial Distribution of Heavy Elements in galaxies and the Universe
    • The formation history of the galaxy is imprinted in such internal structure of the galaxy, which will be obtained with the Integral Field Spectrographs and Adaptive Optics.
    • Metallicity gradients of nearby elliptical galaxies observed (Kobayashi & Arimoto 99).
    • Color gradients of distant (z<1) elliptical galaxies observed (Tamura, Kobayashi, et al. 00).
  • GRAPE-SPH Chemodynamical Simulation
    • I've simulated the formation and evolution of more than a hundred elliptical galaxies from the CDM initial fluctuation. GRAPE is a Japan-made special computer to calculate gravity.
    • By reproducing the observed variety of radial metallicity gradients, I conclude that not all ellipticals formed by major mergers, but some of them formed monolithically (Kobayashi 2004).
    • The observed scaling relations and fundamental plane can be reproduced (Kobayashi 2005).
    • Chemodynamical evolution of the Milky Way Galaxy for the Galactic Archaeology (Kobayashi, Nakasato, in prep.).
  • Cosmic Chemical Enrichment with GADGET
    • I've introduced my schemes of feedback and chemical enrichment into GADGET, which is widely used parallel SPH code, German-made.
    • I succeed in blowing the galactic winds from a small disk galaxy, not by hand but by supernova thermal feedback.
    • Cosmic SFRs, chemical evolution, mass-dependent galactic winds, and the mass-metallicity relation of galaxies are reproduced (Kobayashi, Springel, White 06).
  • Origin of Galactic Morphology
    • How did spiral and elliptical galaxies form? What are dwarf galaxies? What are DLA, LBG, ERO, DRG, BzK,...
  • Environmental Effects
    • Galaxy formation in fields vs clusters? Elemental abundance patterns of ICM?
  • Hypernovae nucleosynthesis (Kobayashi, Umeda, Tominaga, et al. 06)
  • Gamma-ray burst rates (Kobayashi, Maeda, in prep.)

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