Ionized gas in early-type galaxies: Its effect on Mgb and other stellar line-strength indices
| dc.creator | Goudfrooij, Paul | |
| dc.creator | Emsellem, Eric | |
| dc.date | 1996-02-09 | |
| dc.date.accessioned | 2026-07-07T06:32:00Z | |
| dc.date.available | 2026-07-07T06:32:00Z | |
| dc.description | 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. | |
| dc.description | Astronomy and Astrophysics Letters, in press (accepted Jan 11, 1996). 4 pages in revised A&A LaTeX style (enclosed); figures enclosed. Requires psfig.sty | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9602046 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9602046 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/98775 | |
| dc.subject | Astrophysics | |
| dc.title | Ionized gas in early-type galaxies: Its effect on Mgb and other stellar line-strength indices | |
| dc.type | text |