The Baryonic Tully-Fisher Relation

Details The Baryonic Tully-Fisher Relation The Baryonic Tully-Fisher Relation

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19512901m&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #129.01; Bulletin of the American Astronomical Society, Vol. 31, p.1559

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We extend the Tully-Fisher relation over five decades in stellar mass using new data for dwarf low surface brightness galaxies. The data include many faint galaxies with masses as low as M* = 106 M&sun; and circular velocities as low as Vc = 40 km/s. We find a clear break in the optical-NIR Tully-Fisher relation: galaxies with Vc < 90 km/s fall systematically below the relation defined by brighter galaxies. These faint galaxies are however very gas rich; adding in the gas mass and plotting baryonic mass Mb = M* + Mgas in place of luminosity restores a single linear relation. The Tully-Fisher relation appears fundamentally to be a relation between rotation velocity and total baryonic mass. This work has been supported in part by NSF grants AST 84-08225, AST 87-18465, AST 99-01663 and NASA grants NGL 05002140 and NAGW 1710.

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