SIMBAD references

2009ApJ...696..681A - Astrophys. J., 696, 681-689 (2009/May-1)

Oxygen metallicity determinations from optical emission lines in early-type galaxies.


Abstract (from CDS):

We measured the oxygen abundances of the warm (T ∼ 104 K) phase of gas in seven early-type galaxies through long-slit observations. A template spectra was constructed from galaxies void of warm gas and subtracted from the emission-line galaxies, allowing for a clean measurement of the nebular lines. The ratios of the emission lines are consistent with photoionization, which likely originates from the ultraviolet flux of postasymototic giant branch stars. We employ H II region photoionization models to determine a mean oxygen metallicity of 1.01±0.50 solar for the warm interstellar medium (ISM) in this sample. This warm ISM 0.5-1.5 solar metallicity is consistent with modern determinations of the metallicity in the hot (T ∼ 106-107 K) ISM and the upper range of this warm ISM metallicity is consistent with stellar population metallicity determinations. A solar metallicity of the warm ISM favors an internal origin for the warm ISM such as asymptotic giant branch mass loss within the galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: ISM

Simbad objects: 21

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