AAS 195th Meeting, January 2000
Session 129. Formation and Distribution of Galaxies
Oral, Saturday, January 15, 2000, 2:00-3:30pm, Regency VI

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[129.01] The Baryonic Tully-Fisher Relation

S.S. McGaugh (U. Maryland), J.M. Schombert, G.D. Bothun (U. Oregon), W.J.G. de Blok (ATNF)

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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The author(s) of this abstract have provided an email address for comments about the abstract: ssm@astro.umd.edu

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