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Dust emission from the first massive galaxies

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arxiv 2001.04303 v1 pith:GYAZSH7H submitted 2020-01-13 astro-ph.GA astro-ph.CO

classification astro-ph.GAastro-ph.CO
keywords galaxiesdustmassiveobservedsedsemissionenergyfirst
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abstract

We compare observed far-infrared (FIR) galaxy spectral energy distributions (SEDs) at $z\sim6$ and theoretical predictions for first massive population II (Pop II) galaxies. Observed FIR SEDs at $z\gtrsim5$ are broad and shifted to bluer wavelengths when compared to galaxies at $z\sim3$. By implementing an analytical model for dust emission from Pop II massive galaxies,we were able to reproduce the observed behaviour as a consequence of the high energy densities and silicate-rich dust composition of high-$z$ model galaxies. As noted in a previous work, the non-blackbody nature of galaxy SEDs at $z \sim 6$ should be taken into account when interpreting measurements of FIR luminosities to avoid underestimating star formation rates.

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Cited by 1 Pith paper

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  1. Determining Total Infrared Luminosities from Submm Measurements of High Redshift Galaxies

    astro-ph.GA 2026-07 conditional novelty 5.0 of 10

    IR SED broadening in high-z galaxies is driven primarily by luminosity density, requiring ~1.6–1.7 (up to ~2) corrections to modified-blackbody total infrared luminosities.

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