Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.1105g&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #11.05; Bulletin of the American Astronomical Society, Vol. 28, p.840
Astronomy and Astrophysics
Astronomy
Scientific paper
In the light of the recent finding that nebular emission lines are commonly found in the inner regions of early-type galaxies, we evaluate their effect via stellar absorption-line indices. We derive analytical expressions for changes induced by the presence of nebular emission lines, both for atomic and molecular absorption-line indices. We find that the [Ni] emission-line doublet at 5199 Angstroms \ can significantly affect Mgb line-strength measurements. For typical equivalent widths of the [Ni] doublet in nuclei of early-type galaxies featuring nebular emission, the Mgb index is artificially enhanced by 0.4--2 Angstroms. This represents a significant fraction of the typical equivalent width of the Mgb line in early-type galaxies. We argue that this effect should be considered when studying line-strength gradients in the inner regions of early-type galaxies. Several illustrations of this effect will be shown.
Emsellem Eric
Goudfrooij Paul
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