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arXiv:astro-ph/9602046 (astro-ph)
[Submitted on 9 Feb 1996]

Title:Ionized gas in early-type galaxies: Its effect on Mgb and other stellar line-strength indices

Authors:Paul Goudfrooij (ESO Garching), Eric Emsellem (Sterrewacht Leiden)
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Abstract: 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 to 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 A 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 A, which represents a significant fraction of the typical equivalent width of the Mgb line in early-type galaxies.
We illustrate this effect in the case of NGC 2974.
Comments: Astronomy and Astrophysics Letters, in press (accepted Jan 11, 1996). 4 pages in revised A&A LaTeX style (enclosed); figures enclosed. Requires this http URL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/9602046
  (or arXiv:astro-ph/9602046v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9602046

Submission history

From: Paul Goudfrooij [view email]
[v1] Fri, 9 Feb 1996 17:16:30 UTC (49 KB)
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