Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6017s&link_type=abstract
American Astronomical Society Meeting 205, #60.17; Bulletin of the American Astronomical Society, Vol. 36, p.1445
Other
Scientific paper
We present initial results from a study to evaluate the role of disk stability in setting the observed upper bound to spiral galaxy rotational velocities (Vrot ˜ 400 km/s). The canonical galaxy formation paradigm leads to scaling relations between Vrot and other structural properties of disks. Within this framework disks are stable if the spin parameter of the halo (λ ) exceeds the ratio of the disk mass to that of the halo (md). An upper limit to Vrot then arises because massive halos retain all of their baryons during disk formation, and thus few have λ large enough to satisfy the stability requirement. We have obtained high-quality Hα spectra, HI aperture synthesis maps and accurate I-band images for 8 of the fastest known rotators, which are being used in an attempt to measure λ and md via the scaling relations to test this hypothesis. We discuss a first analysis of this data, as well as the observed scaling relations for a sample of over 4000 spiral galaxies from the SFI++ database maintained at Cornell. This work is partially funded by NSF grants AST-0307396 and AST-0307661.
Giovanelli Riccardo
Spekkens Kristine
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