Dust emission from the first massive galaxies
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.
- Publication:
-
Boletin de la Asociacion Argentina de Astronomia La Plata Argentina
- Pub Date:
- July 2020
- DOI:
- 10.48550/arXiv.2001.04303
- arXiv:
- arXiv:2001.04303
- Bibcode:
- 2020BAAA...61B.180D
- Keywords:
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- galaxies: high-redshift;
- galaxies: evolution;
- galaxies: formation;
- galaxies: star formation;
- cosmology: theory;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 3 pages, 2 figures. Accepted for publication in BAAA, Vol. 61B, 2020