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26 April 2024 |
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Kinematic Downsizing at z~2 | | Raymond C. Simons
; Susan A. Kassin
; Jonathan R. Trump
; Benjamin J. Weiner
; Timothy M. Heckman
; Guillermo Barro
; David C. Koo
; Yicheng Guo
; Camilla Pacifici
; Anton Koekemoer
; Andrew W. Stephens
; | | Date: |
31 May 2016 | | Abstract: | We present results from a survey of the internal kinematics of 49
star-forming galaxies at z$,sim,$2 in the CANDELS fields with the
Keck/MOSFIRE spectrograph (SIGMA, Survey in the near-Infrared of Galaxies with
Multiple position Angles). Kinematics (rotation velocity $V_{rot}$ and
integrated gas velocity dispersion $sigma_g$) are measured from nebular
emission lines which trace the hot ionized gas surrounding star-forming
regions. We find that by z$,sim,$2, massive star-forming galaxies
($log,M_*/M_{odot}gtrsim10.2$) have assembled primitive disks: their
kinematics are dominated by rotation, they are consistent with a marginally
stable disk model, and they form a Tully-Fisher relation. These massive
galaxies have values of $V_{rot}/sigma_g$ which are factors of 2-5 lower than
local well-ordered galaxies at similar masses. Such results are consistent with
findings by other studies. We find that low mass galaxies
($log,M_*/M_{odot}lesssim10.2$) at this epoch are still in the early stages
of disk assembly: their kinematics are often supported by gas velocity
dispersion and they fall from the Tully-Fisher relation to significantly low
values of $V_{rot}$. This "kinematic downsizing" implies that the process(es)
responsible for disrupting disks at z$,sim,$2 have a stronger effect and/or
are more active in low mass systems. In conclusion, we find that the period of
rapid stellar mass growth at z$,sim,$2 is coincident with the nascent
assembly of low mass disks and the assembly and settling of high mass disks. | | Source: | arXiv, 1606.0009 | | Services: | Forum | Review | PDF | Favorites | |
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