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• W4376636094 endingPage "3132" @default.
• W4376636094 startingPage "3119" @default.
• W4376636094 abstract "We present an empirical analysis of the properties of dust-continuum emission in a sample of 17 galaxies in the early Universe ($4 < z < 8$) with well-sampled far-infrared (FIR) spectral energy distributions (SEDs) compiled from the literature. We place our results into context by self-consistently comparing to samples of nearby star-forming galaxies, luminous infrared galaxies (LIRGs), and quasars. With the exception of two sources, we find no significant evolution in the dust emissivity index across cosmic time, measuring a consistent value of $beta_text{IR} = 1.8 pm 0.3$ at $z > 4$, suggesting the effective dust properties do not change dramatically for most galaxies. Despite having comparable stellar masses, we find the high-redshift galaxies to be similar to, or even more extreme than, LIRGs in the HERUS sample in terms of dust temperature ($T_text{dust} > 40 , mathrm{K}$) and IR luminosity ($L_text{IR} > 10^{11} , mathrm{L_odot}$). We find the dust temperature evolves mildly towards high redshift, though the LIRGs and quasars exhibit elevated temperatures indicating a more efficient and/or additional heating mechanism. Where available, we compare stellar-mass estimates to our inferred dust masses, whose degeneracy with dust temperature can only be mitigated with a well-constrained SED. In merely half of the cases the dust yield may be explained by supernovae alone, with four sources ($44%$) significantly exceeding a highly optimistic yield where $M_text{dust} approx 0.01 M_*$. We discuss possible explanations for this apparent inconsistency and potential observational biases in the measurements of the dust properties of high-redshift galaxies, including in the current IR-bright sample." @default.
• W4376636094 created "2023-05-17" @default.
• W4376636094 creator A5003021088 @default.
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• W4376636094 creator A5020335855 @default.
• W4376636094 creator A5045313350 @default.
• W4376636094 creator A5082283978 @default.
• W4376636094 date "2023-05-16" @default.
• W4376636094 modified "2023-10-14" @default.
• W4376636094 title "An empirical study of dust properties at the earliest epochs" @default.
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