Abstract
We present first results of a comprehensive survey of deep long-slit spectra along the minor axis of bulges of edge-on spiral galaxies. Our results indicate that stellar populations in bulges are fairly old and encompass a range of metallicities. The luminosity-weighted ages of bulges range from those found for cluster ellipticals to slightly ‘younger’ (by up to only a few Gyr, however). Their α/Fe element ratio is typically supersolar, consistent with those found in giant ellipticals. The radial line-strength gradients in bulges correlate with bulge luminosity. Generally, these findings are more compatible with predictions of the ‘dissipative collapse’ model than with those of the ‘secular evolution’ model.
*Based on observations obtained at ESO, La Silla, Chile (Observing Programmes 58.A-0192, 59, A-0774, and 61, A-0326), and that the Isaac Newton Telescope operad on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos the instituto de Astrofisica de Canarias
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Goudfrooij, P., Gorgas, J., Jablonka, P. (2000). Line Strengths and Line Strength Gradients in Bulges Along the Hubble Sequence. In: Block, D.L., Puerari, I., Stockton, A., Ferreira, D. (eds) Toward a New Millennium in Galaxy Morphology. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4114-7_7
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DOI: https://doi.org/10.1007/978-94-011-4114-7_7
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