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oai:docta.ucm.es:20.500.14352/518342023-08-27T06:23:05Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Jablonka, P. author Gorgas García, Francisco Javier author Goudfrooij, P. author 2007-11 We present the analysis of the radial gradients of stellar absorption lines in a sample of 32 bulges of edge-on spiral galaxies, spanning nearly the full Hubble sequence (from S0 to Sc types), and a large range of velocity dispersion (from about 60 to 300 km s^-1). Different diagnostics such as index-index, gradient-gradient diagrams, and simple stellar population models are used to tackle the origin of the variation of the bulge stellar population. We find that the vast majority of bulges show older age, lower metallicity and higher [α/Fe] in their outer regions than in their central parts. The radial gradients in [Fe/H] are 2 to 3 times larger than in Log(age). The relation between gradient and bulge velocity dispersion is interpreted as a gradual build up of the gradient mean values and their dispersions from high to low velocity dispersion, rather than a pure correlation. The bulge effective radii and the Hubble type of the parent galaxies seem to play a more minor role in causing the observed spatial distributions. At a given velocity dispersion, bulges and ellipticals share common properties. 0004-6361 10.1051/0004-6361:20066691 https://hdl.handle.net/20.500.14352/51834 http://dx.doi.org/10.1051/0004-6361:20066691 http://www.aanda.org/ Stellar population gradients in bulges along the Hubble sequence - II. Relations with galaxy properties