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25 April 2024 |
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Article overview
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Diverse Structural Evolution at z > 1 in Cosmologically Simulated Galaxies | | Gregory F. Snyder
; Jennifer Lotz
; Christopher Moody
; Michael Peth
; Peter Freeman
; Daniel Ceverino
; Joel Primack
; Avishai Dekel
; | | Date: |
4 Sep 2014 | | Abstract: | From mock Hubble Space Telescope images, we quantify non-parametric
statistics of galaxy morphology, thereby predicting the emergence of
relationships among stellar mass, star formation, and observed rest-frame
optical structure at 1 < z < 3. We measure these diagnostics of galaxy
morphology from cosmological simulations of the formation of 22 central
galaxies with 9.3 < log_10 M_*/M_sun < 10.7. These high-spatial-resolution
zoom-in calculations enable accurate modeling of the rest-frame UV and optical
morphology. This could depend strongly on dust radiative transfer, which we
model using the Sunrise code. Even with small numbers of galaxies, we find that
structural evolution is neither universal nor monotonic: galaxy interactions
may trigger either bulge or disc formation, and optically bulge-dominated
galaxies at this mass may not remain so forever. Simulated galaxies with M_* >
10^10 M_sun contain relatively more disc-dominated light profiles than those
with lower mass, reflecting significant disc brightening in some haloes at 1 <
z < 2. By this epoch, simulated galaxies with specific star formation rates
below 10^-9.7 yr^-1 are more likely than normal star-formers to have a broader
mix of structural types, especially at M_* > 10^10 M_sun. We analyze a
cosmological major merger at z~1.5 and find that the newly proposed MID
morphology diagnostics trace later stages while G-M20 trace earlier ones. MID
is sensitive also to clumpy star-forming discs. The observability time of
typical MID-enhanced events in our simulation sample is less than 100 Myr. A
larger sample of cosmological assembly histories may be required to calibrate
such diagnostics in the face of their sensitivity to viewing angle,
segmentation algorithm, and various phenomena such as clumpy star formation and
minor mergers. | | Source: | arXiv, 1409.1583 | | Services: | Forum | Review | PDF | Favorites | |
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