Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310510g&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #105.10; Bulletin of the American Astronomical Society, Vol. 30, p.1408
Astronomy and Astrophysics
Astronomy
Scientific paper
We show the first results of an extensive imaging and medium-resolution spectrophotometric survey of edge-on spirals to investigate radial population gradients in their bulge component (i.e., along their minor axis). Bulges of spiral galaxies constitute a main key to our understanding of the origin of the Hubble sequence. Located at the centers of spirals, they hold the signature of the sequence of formation ---outside-in or inside-out--- of the different sub-systems building a spiral galaxy: halo, disc, and bulge. The main goal of this proposal is to put significant constraints on current theories regarding bulge formation: (i) Bulges form on short time scales (the dissipative collapse scenario) versus (ii) Bulges form from processed disk material through bar-driven re-distribution of angular momentum (the Secular Evolution scenario). As to the latter scenario, models of mixing gas flows have shown that the radial abundance gradients are significantly reduced with respect to those in the dissipative collapse scenario (at a given bulge luminosity). In this presentation, we will present first results of this survey. We will concentrate on Sa -- Sc galaxy types for which bulges stand out clearly. We have considered a suitable range in luminosity for each sub-type.
Gorgas Javier
Goudfrooij Paul
Jablonka Pascale
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