Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..661g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 661-666. Research supported by Lowell Observatory.
Astronomy and Astrophysics
Astrophysics
7
Astronomical Photometry, Faint Objects, Galactic Evolution, Spectrophotometry, Color, Emission Spectra, H Lines, Photoionization, Spectral Line Width
Scientific paper
Spectrophotometric observations are presented for two distant and one nearby faint blue galaxy. All three systems have emission lines that are appropriate in strength for their optical colors and, by comparison with nearby blue galaxies, the emission lines are likely to be due to photoionization by OB stars. The two distant galaxies resemble nearby luminous blue galaxies of the types cataloged by Zwicky or Markarian and thus are not unique classes of objects in terms of stellar content. If seen at higher redshifts, they would fall into the domain populated by very faint very blue galaxies. Blue galaxies at high redshifts are not required to be in very young or starburst evolutionary stages. The rates of spectral evolution of these objects can reasonably cover a wide range of possibilities; thus, it is impossible to tell from studies of individual galaxies of this type whether or not there is net evolution in the galaxy population between the present epoch and z of roughly 0.25. The nearby faint blue galaxy is a typical, noninteracting amorphous system.
Gallagher John S. III
Hamilton Donald
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