A metallicity-flattening relation for dwarf elliptical galaxies
It is shown that bright cluster dwarf ellipticals follow a relation between metallicity and apparent flattening. Rounder dwarfs tend to be more metal-rich. The evidence is based on colour as well as spectroscopic line-strength data from the literature. The large scatter of dEs around the mean metall...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2002-10, Vol.394 (1), p.L15-L18 |
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| creator | Barazza, F. D. Binggeli, B. |
| description | It is shown that bright cluster dwarf ellipticals follow a relation between metallicity and apparent flattening. Rounder dwarfs tend to be more metal-rich. The evidence is based on colour as well as spectroscopic line-strength data from the literature. The large scatter of dEs around the mean metallicity-luminosity relation, usually ascribed to large observational errors, turns out to be an ellipticity effect. In the magnitude range $-14 \ga M_B \ga -18$ the metallicity of dEs depends more strongly on ellipticity than luminosity. A possible explanation is that galaxies with masses around $10^{9}~M_{\odot}$ suffered a partial blowout of metal-enriched gas along their minor axis, rendering ellipticity a critical parameter for metallicity (De Young & Heckman [CITE]). |
| doi_str_mv | 10.1051/0004-6361:20021294 |
| format | Article |
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D.</creatorcontrib><creatorcontrib>Binggeli, B.</creatorcontrib><title>A metallicity-flattening relation for dwarf elliptical galaxies</title><title>Astronomy and astrophysics (Berlin)</title><description>It is shown that bright cluster dwarf ellipticals follow a relation between metallicity and apparent flattening. Rounder dwarfs tend to be more metal-rich. The evidence is based on colour as well as spectroscopic line-strength data from the literature. The large scatter of dEs around the mean metallicity-luminosity relation, usually ascribed to large observational errors, turns out to be an ellipticity effect. In the magnitude range $-14 \ga M_B \ga -18$ the metallicity of dEs depends more strongly on ellipticity than luminosity. 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The large scatter of dEs around the mean metallicity-luminosity relation, usually ascribed to large observational errors, turns out to be an ellipticity effect. In the magnitude range $-14 \ga M_B \ga -18$ the metallicity of dEs depends more strongly on ellipticity than luminosity. A possible explanation is that galaxies with masses around $10^{9}~M_{\odot}$ suffered a partial blowout of metal-enriched gas along their minor axis, rendering ellipticity a critical parameter for metallicity (De Young & Heckman [CITE]).</abstract><pub>EDP Sciences</pub><doi>10.1051/0004-6361:20021294</doi><oa>free_for_read</oa></addata></record> |
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| ispartof | Astronomy and astrophysics (Berlin), 2002-10, Vol.394 (1), p.L15-L18 |
| issn | 0004-6361 1432-0746 |
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| source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; EZB-FREE-00999 freely available EZB journals |
| subjects | galaxies: dwarf galaxies: elliptical galaxies: evolution galaxies: fundamental parameters galaxies: general |
| title | A metallicity-flattening relation for dwarf elliptical galaxies |
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