NOAO >   Observing Info >   Approved Programs >   2004B-0180

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Proposal Information for 2004B-0180


PI: Laura Ferrarese, Rutgers University, lff@physics.rutgers.edu
Address: Physics Department, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA

CoI: Alessandro Pizzella, Universita' degli Studi di Padova

Title: The \vs Relation for Giant Low Surface Brightness Galaxies

Abstract: Using a sample of 16 galaxies, ranging from very late type to giant grand design spirals, Ferrarese (2002) found that the large scale HI circular velocity of the disk, and the central stellar velocity dispersion of the bulge, are tightly correlated. The circular velocity is defined as the asymptotic value reached by the HI rotation curve at several tens of kpc from the galaxy center. Bulge velocity dispersions are measured within apertures two orders of magnitude smaller. Therefore, the connection between \vc and \sigma is not a tautology. Rather, its existence holds important clues as to the mechanisms by which bulges form, provides tight observational constraints for numerical CDM simulations following the formation and evolution of galaxies, and even hints at a correlation between the masses of the central Supermassive Black Holes (SBH) and those of the surrounding dark matter halos. The goal of this proposal is to further explore the implication of the \vs relation for bulge and SBH formation. Because of their fundamentally different characteristics (relative to the galaxies which currently define the relation), we focus our attention on a sample of seven HI-rich (and thereby unevolved) giant Low Surface Brightness galaxies. The gas rotation curve, and bulge stellar velocity dispersion will be measured simultaneously using long-slit, moderate resolution spectra covering the 4500 - 6800 A wavelength region. The project will be completed in 4 nights of 4m time.


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