Ionized gas in elliptical and S0 galaxies. I - A survey for H-alpha and forbidden N II emission

Details Ionized gas in elliptical and S0 galaxies. I - A survey for H-alpha and forbidden N II emission Ionized gas in elliptical and S0 galaxies. I - A survey for H-alpha and forbidden N II emission

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1062p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1062-1085.

Astronomy and Astrophysics

Astronomy

279

Disk Galaxies, Elliptical Galaxies, Emission Spectra, H Alpha Line, Ionized Gases, Nitrogen Ions, Astronomical Spectroscopy, Charge Coupled Devices, Galactic Evolution, Galactic Nuclei, Spectral Line Width, Spectrum Analysis

Scientific paper

A spectroscopic survey of a large sample of southern E and S0 galaxies in order to detect ionized gas in the nuclei is reported. The strongest line in the 6000-7000 A range was nearly always forbidden N II 6584 A, followed by H-alpha and forbidden S II 6716, 6731 A. Identical detection rates of about 50 percent were obtained for the forbidden N II line in both E and S0 galaxies. The mass of ionized gas in early-type galaxies was very small, with values typically in the range 1000-10,000 solar masses. The relative emission-line strengths in virtually every case were indistinguishable from those of LINER nuclei. The observed values of the forbidden N II 6584 A/H-alpha ratios fell mostly between one and three and seem correlated with galaxy absolute magnitude. The existence of such a correlation may be indicative of metallicity differences.

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