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25 April 2024 |
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A Transition Mass in the Local Tully-Fisher Relation | | Raymond C. Simons
; Susan A. Kassin
; Benjamin J. Weiner
; Timothy M. Heckman
; Janice C. Lee
; Jennifer M. Lotz
; Michael Peth
; Kirill Tchernyshyov
; | | Date: |
12 Jun 2015 | | Abstract: | 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$_*$ = 9.5 M$_{odot}$. Above this
mass, nearly all galaxies are rotation-dominated, on average more
morphologically disk-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 disks on the
TFR or asymmetric or compact galaxies which scatter off. We refer to this
transition mass as the "mass of disk formation", M$_{mathrm{df}}$ because
above it all star-forming galaxies form disks (except for a small number of
major mergers and highly star-forming systems), whereas below it a galaxy may
or may not form a disk. | | Source: | arXiv, 1506.4144 | | Services: | Forum | Review | PDF | Favorites | |
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