• David R. Andersen
  • Matthew A. Bershady
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)


We present integral-field echelle observations of the warm, ionized phase of the interstellar medium (ISM) of many, nearly face-on spiral galaxies. Luminosities and line-widths of Hα, [SII] and [NII] reveal several distinct trends in the conditions of the ionized gas. In principle these measures yield estimates for temperature, density, and energy sources of the kinematic heating. The emergent picture is complex: we find variations of the line-widths between galaxies and with galactic radius, and correlations between line-widths and emission-line luminosity and line-ratio. Two related bimodalities appear in line-ratio distributions and in the radial distribution of Hα luminosity. We briefly contrast ISM observations of nearby galaxies to the Milky Way and high-z galaxies.


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Copyright information

© Springer 2007

Authors and Affiliations

  • David R. Andersen
    • 1
  • Matthew A. Bershady
    • 2
  1. 1.University of WisconsinUSA
  2. 2.Herzberg Institute of AstrophysicsCanada

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