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Satellite Infall and the Growth of Bulges of Spiral Galaxies

AuthorsEliche-Moral, M. C.; Balcells, Marc; Aguerri, J. A. L.; González-García, A. César
Satellite Infall
Growth of Bulges of Spiral
Institute of Heritage Sciences
Instituto de Ciencias del Patrimonio
Issue Date18-Jan-2005
PublisherCornell University
CitationArXiv > Astrophysics (astro-ph), 13 pp.
Abstract[EN]For bulges of spiral galaxies, the concentration, or Sersic index, increases with bulge luminosity and bulge-to-disk ratio B/D (Andredakis, Peletier, & Balcells, 1995). Does this trend trace the growth of bulges via satellite accretion? And, is satellite infall consistent with this trend? Aguerri, Balcells, & Peletier (2001) (ABP01, hereandafter) investigated this question with N-body simulations of the accretion of dense, spheroidal satellites. Here, we expand on that work by running N-body simulations of the accretion of satellites that have realistic densities. Satellites are modeled as disk-bulge structures with their own darkmatter halo. A realistic density scaling with the primary galaxy is ensured by using the Tully-Fisher relation. Our merger models show that most satellites disrupt before reaching the center. However, a bulge-disk decomposition of the surface density profile after the accretion shows an increase of both the B/D and the Sersic index n of the bulge. The increase in the mass and concentration of the inner Sersic component is due to inward piling up of disk material due to transient bars during the satellite orbital decay. This research is described in Eliche-Moral et al. (2005).
DescriptionLaTeX, 13 pages, 6 figures, gzipped tar file. Proceeding of the Joint European and National Astronomical Meeting, "The Many Scales in the Universe", held in Granada, Spain, 2004
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