AAS 200th meeting, Albuquerque, NM, June 2002
Session 40. Evolution of Galaxies, Galaxy Surveys, IGM
Display, Tuesday, June 4, 2002, 10:00am-6:30pm, SW Exhibit Hall

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[40.05] Spectroscopic Properties of a Large Sample of KISS Emission-Line Galaxy Candidates

A. Jangren, J. J. Salzer (Wesleyan University), G. Wegner (Dartmouth College), C. Gronwall (Johns Hopkins University), J. Melbourne (University of California, Santa Cruz)

We present spectroscopic properties of a sample of 326 emission-line galaxy (ELG) candidates obtained with the MDM 2.4-m telescope. The data include redshifts, reddening estimates, equivalent line widths, H\alpha line fluxes, and emission-line ratios. Our sample is drawn from the Kitt Peak International Spectroscopic Survey (KISS) -- an ongoing wide-field objective-prism survey for extragalactic emission-line objects which to date has discovered over 2000 ELG candidates. The KISS catalog lists redshifts, equivalent widths, and line fluxes, which are determined from the digital objective-prism spectra. Here we explore how well these survey data agree with the MDM follow-up slit spectra.

Our procedure for selecting ELG candidates from KISS observations appears to be very reliable: 96% of the candidates are verified to have emission lines. The KISS objective-prism redshifts are shown to be in good agreement with the redshifts determined from the follow-up spectra. Substantial differences are found for only 5% of the candidates; these are often intermediate-redshift sources where a strong [OIII] line in the objective-prism spectrum was identified as the H\alpha line.

We also use the MDM spectra to classify ELG candidates based on their [NII]/H\alpha and [OIII]/H\beta flux ratios. Slightly more than three-quarters of the ELGs are determined to be starburst galaxies. Active galaxies (mainly Seyfert galaxies and LINERs) make up nearly 20% of the sample.

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.