Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 452, Issue 1, Pages 986-997Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1298
Keywords
galaxies: evolution; galaxies: formation; galaxies: fundamental parameters; galaxies: kinematics and dynamics
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Funding
- STScI JDF
- NSF [AST 95-29098, 00-71198]
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We study the stellar mass Tully-Fisher relation (TFR; stellar mass versus rotation velocity) for a morphologically blind selection of emission line galaxies in the field at redshifts 0.1 < z < 0.375. Kinematics (sigma(g), V-rot) are measured from emission lines in Keck/DEIMOS spectra and quantitative morphology is measured from V-and I-band Hubble images. We find a transition stellar mass in the TFR, log M-*/M-circle dot = 9.5. Above this mass, nearly all galaxies are rotation dominated, on average more morphologically disc-like according to quantitative morphology, and lie on a relatively tight TFR. Below this mass, the TFR has significant scatter to low rotation velocity and galaxies can either be rotation-dominated discs on the TFR or asymmetric or compact galaxies which scatter off. We refer to this transition mass as the 'mass of disc formation', M-df because above it all star-forming galaxies form discs (except for a small number of major mergers and highly star-forming systems), whereas below it a galaxy may or may not form a disc.
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