The mass distribution in early type disk galaxies

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dc.creatorNoordermeer, E.
dc.creatorvan der Hulst, J. M.
dc.creatorSancisi, R.
dc.creatorSwaters, R. A.
dc.creator.
dc.date2003-10-30
dc.date.accessioned2026-07-07T02:10:56Z
dc.date.available2026-07-07T02:10:56Z
dc.descriptionWe are studying the mass distribution in a sample of 50 early type spiral galaxies, with morphological type betweens S0 and Sab and absolute magnitudes M_B between -18 and -22; they form the massive and high-surface brightness extreme of the disk galaxy population. Our study is designed to investigate the relation between dark and luminous matter in these systems, of which very little yet is known. From a combination of WSRT HI observations and long-slit optical spectra, we have obtained high-quality rotation curves. The rotation velocities always rise very fast in the center; in the outer regions, they are often declining, with the outermost measured velocity 10-25% lower than the maximum. We decompose the rotation curves into contributions from the luminous (stellar and gaseous) and dark matter. The stellar disks and bulges always dominate the rotation curves within the inner few disk scale lengths, and are responsible for the decline in the outer parts. As an example, we present here the decompositions for UGC 9133. We are able to put tight upper and lower limits on the stellar mass-to-light ratios.
dc.description6 pages, 4 figures. To appear in IAU Symposium 220, "Dark Matter in Galaxies", ed. Stuart Ryder, D.J. Pisano, Mark walker & Ken Freeman, Publ. Astron. Soc. Pac. For a version with high resolution figures, see http://www.astro.rug.nl/~edo/IAU220.ps
dc.identifierhttps://arxiv.org/abs/astro-ph/0310868
dc.identifierhttp://arxiv.org/abs/astro-ph/0310868
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6910
dc.subjectAstrophysics
dc.titleThe mass distribution in early type disk galaxies
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