Ionization state of inter-stellar medium in galaxies: evolution, SFR-M * -Z dependence, and ionizing photon escape

@article{Nakajima2014IonizationSO,
  title={Ionization state of inter-stellar medium in galaxies: evolution, SFR-M * -Z dependence, and ionizing photon escape},
  author={Kimihiko Nakajima and Masami Ouchi},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={442},
  pages={900-916}
}
  • K. Nakajima, M. Ouchi
  • Published 1 September 2013
  • Physics
  • Monthly Notices of the Royal Astronomical Society
We present a systematic study for ionization state of inter-stellar medium in galaxies at z=0-3 with ~140,000 SDSS galaxies and 108 intermediate to high redshift galaxies from the literature, using an ionization-parameter sensitive line ratio of [OIII]5007/[OII]3727 and photoionization models. We confirm that z=2-3 galaxies show an [OIII]/[OII] ratio significantly higher than a typical star-forming galaxy of SDSS by a factor of >~10, and the photoionization models reveal that these high-z… 
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