2017/09/30 by Jason Jaacks, Steven L. Finkelstein, Volker Bromm
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Dark matter #Extinction (optical mineralogy) #Galactic halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Physics #Redshift #Star formation #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1093/mnras/sty049
Published 01/2018 pages, 5 figures
openalex created_date 2017/10/06 · openalex publication_date 2018/01/05 · arxiv created 2018/01/18 · arxiv updated 2018/01/22 · openalex updated_date 2026/08/06
Using cosmological volume simulations and a custom built sub-grid model for Population III (Pop III) star formation, we examine the baseline dust extinction in the first galaxies due to Pop III metal enrichment in the first billion years of cosmic history. We find that although the most enriched, high-density lines of sight in primordial galaxies can experience a measurable amount of extinction from Pop III dust [E(B − V)max = 0.07, AV, max ≈ 0.28], the average extinction is very low with 〈E(B − V)〉 ≲ 10−3. We derive a power-law relationship between dark matter halo mass and extinction of |E(B-V)∝ M\rm halo0.80|. Performing a Monte Carlo parameter study, we establish the baseline reddening of the ultraviolet spectra of dwarf galaxies at high redshift due to Pop III enrichment only. With this method, we find 〈βUV〉 − 2.51 ± 0.07, which is both nearly halo mass and redshift independent.