Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26s.191g&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
In this poster we investigate the Tully-Fisher (TF) and Baryonic TF (BTF) relations for gas-rich disk galaxies. While the classical TF formulation relates the luminosity of the stars in the galaxy to the disk rotational velocity, the BTF formulation relates the total baryon mass of gas (mostly neutral hydrogen) plus the stellar mass to the rotational velocity. Some authors have found larger dispersions at the faint (dwarf) end of the TF relation eg: Willick (1999), Giovanelli et al. (1995). The larger dispersion at the faint end may hint at a break in the TF and BTF relations, (Gurovich et al. 2004). In this work on the BTF relation, we use the Bruzual & Charlot (2003) GALAXEV code to obtain accurate stellar M/L values in order to estimate the stellar baryon mass of our faint HI-selected field galaxies. This will allow us to delineate the structure of the TF & BTF relations more precisely.
Freeman Ken C.
Gurovich Sebastian
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