Other
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..211h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 211-224.
Other
60
Galactic Structure, H Alpha Line, Ionized Gases, Markarian Galaxies, Star Formation, Ubv Spectra, Astronomical Spectroscopy, Galactic Nuclei, Interstellar Extinction, Spectral Line Width
Scientific paper
Digital images and spectra of the host galaxy of Markarian 231 are presented. Its morphology does not fall within standard classification schemes, but suggests a merger or other violent dynamical disturbance. Spectral features from a young stellar population and ionized gas are present, and the stellar population is younger than normally found in high-luminosity galaxies of any type. H II region-like emission is found only in one area; spectroscopic data suggest a sudden, galaxy-wide cutoff in star formation or show a less extreme, but unusually young, stellar population. A spatially resolved narrow-line region has been identified, of unusually low density and extent about 10 kpc. Gas further out in the galaxy is contiguous with this narrow-line region and appears to be ionized by the nuclear continuum (or possible shocks), but is of such low ionization that the extinction on nearly all lines of sight must be comparable to that presently observed; that is, the clouds responsible for reddening the nuclear continuum have a covering factor near unity.
Hamilton Donald
Keel William C.
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