Further Spectroscopy of the Diffuse Ionized Gas in NGC 891 and Evidence for a Secondary Source of Ionization

@inproceedings{Rand1998FurtherSO,
  title={Further Spectroscopy of the Diffuse Ionized Gas in NGC 891 and Evidence for a Secondary Source of Ionization},
  author={Richard J.. Rand},
  year={1998}
}
Two long-slit spectra of the diffuse ionized gas in NGC 891 are presented. The first reveals variations parallel to the major axis in emission line ratios in the halo gas at z = 700 pc. It is found that filaments of Hα emission show lower values of [N II]/Hα, [S II]/Hα and [O I]/Hα. Although this result is expected if the filaments represent the walls of evacuated chimneys, it merely reflects a more general correlation of these ratios with Hα surface brightness along the slit, and may simply… CONTINUE READING

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