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From the far-ultraviolet to the far-infrared -- galaxy emission at $0le z le 10$ in the Shark semi-analytic model | | Claudia del P. Lagos
; Aaron S. G. Robotham
; James W. Trayford
; Rodrigo Tobar
; Matías Bravo
; Sabine Bellstedt
; Luke J. M. Davies
; Simon P. Driver
; Pascal J. Elahi
; Danail Obreschkow
; Chris Power
; | | Date: |
9 Aug 2019 | | Abstract: | We combine the Shark semi-analytic model of galaxy formation with the
ProSpect software tool for spectral energy distribution (SED) generation to
study the multi-wavelength emission of galaxies from the far-ultraviolet (FUV)
to the far-infrared (FIR) at $0le zle 10$. We produce a physical model for
the attenuation of galaxies across comic time by combining a local Universe
empirical relation to compute the dust mass of galaxies from their gas
metallicity and mass, attenuation curves derived from radiative transfer
calculations of galaxies in the EAGLE hydrodynamic simulation suite, and the
properties of Shark galaxies. We are able to produce a wide range of galaxies,
from the $z=8$ star-forming galaxies with almost no extinction, $z=2$
submillimeter galaxies, down to the normal star-forming and red sequence
galaxies at $z=0$. Quantitatively, we find that Shark reproduces the observed
(i) the $z=0$ FUV-to-FIR, (ii) $0le zle 3$ rest-frame $K$-band, and (iii)
$0le zle 10$ rest-frame FUV luminosity functions, (iv) $zle 8$ UV slopes,
(v) the FUV-to-FIR number counts (including the widely disputed 850$mu$m),
(vi) redshift distribution of bright $850mu$m galaxies and (vii) the
integrated cosmic SED from $z=0$ to $z=1$ to an unprecedented level. This is
achieved without the need to invoke changes in the stellar initial mass
function, dust-to-metal mass ratio, or metal enrichment timescales. Our model
predicts star formation in galaxy disks to dominate in the FUV-to-optical,
while bulges dominate at the NIR at all redshifts. The FIR sees a strong
evolution in which disks dominate at $zle 1$ and starbursts (triggered by both
galaxy mergers and disk instabilities, in an even mix) dominate at higher
redshifts, even out to $z=10$. | | Source: | arXiv, 1908.3423 | | Services: | Forum | Review | PDF | Favorites | |
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