Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2701h&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #27.01D; Bulletin of the American Astronomical Society, Vol. 24, p.1162
Astronomy and Astrophysics
Astronomy
Scientific paper
A comparison of the luminosity functions of two samples of emission line galaxies is to be made so as to determine the extent to which evolutionary effects play a role in these objects from z<0.5 to the present. The distant sample of objects were taken from the 4-Shooter transit surveys of Schmidt, Schneider and Gunn (hereafter SSG). It consists of 370 galaxies whose inclusion was based on the detection of either the Hβ lambda 4861 or the [OIII]lambda lambda 4959,5007 emission line. The nearby sample was taken from the CfA Northern Sky Redshift Survey (Davis, et.al., 1983). From the work of Burg (1987), a subset of 81 galaxies with strong [OIII] emission (EW>25 Angstroms) has been selected. An additional 26 Seyfert galaxies from Edelson (1987) were added to that list. This group of 107 CfA galaxies represented an initial sample to be observed using the Echelle Spectrograph on the 1.5m Oscar Meyer telescope at Palomar Observatory. The spectrograph was operated in a low-resolution, long slit (360'') mode, covering the range from 4350 Angstroms to 7200 Angstroms. Spectra were taken along the major and minor axes of each CfA galaxy, and were modeled to determine how each galaxy would appear in the transit survey as a function of redshift. Having determined the maximum observable redshift for each CfA galaxy, based on the transit survey criteria, a luminosity function is calculated. This is then compared to the observed luminosity function of the sample of distant emission line galaxies, and, upon completion of this work, a statement will be made on the effects of evolution on various sub-classes of emission line galaxies.
Horowitz Irwin Kenneth
Schmidt Matthias
Schneider David P.
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