2021/04/28 by Sérgio M. Santos, Sérgio Santos, David Sobral +11
Physics and Astronomy · #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Luminosity #Luminosity function #Physics #Radio Astronomy Observations and Technology #Redshift #Star (game theory) #Star formation #Stellar mass #astro-ph.GA
paper · pdf · doi:10.1093/mnras/stab1218
Accepted for publication in MNRAS. 20 pages, 13 figures, 4 tables
openalex publication_date 2021/04/28 · arxiv created 2021/04/30 · openalex created_date 2021/05/10 · arxiv updated 2021/05/12 · openalex updated_date 2026/08/05
ABSTRACT We measure the evolution of the rest-frame UV luminosity function (LF) and the stellar mass function (SMF) of Lyman-α (Ly α) emitters (LAEs) from z ∼ 2 to z ∼ 6 by exploring ∼4000 LAEs from the SC4K sample. We find a correlation between Ly α luminosity (LLy α) and rest-frame UV (MUV), with best fit M\rm UV=-1.6-0.3+0.2log 10 (\rm LLy α /erg s-1)+47-11+12 and a shallower relation between LLy α and stellar mass (M⋆), with best fit log 10 (\rm M_⋆ /\rm M_\odot)=0.9-0.1+0.1log 10 (\rm LLy α /erg s-1)-28-3.8+4.0. An increasing LLy α cut predominantly lowers the number density of faint MUV and low M⋆ LAEs. We estimate a proxy for the full UV LFs and SMFs of LAEs with simple assumptions of the faint end slope. For the UV LF, we find a brightening of the characteristic UV luminosity (M\rm UV^*) with increasing redshift and a decrease of the characteristic number density (Φ*). For the SMF, we measure a characteristic stellar mass (\rm M_⋆ ^*/\rm M_\odot ) increase with increasing redshift, and a Φ* decline. However, if we apply a uniform luminosity cut of log 10 (\rm LLy α /erg s-1) ≥ 43.0, we find much milder to no evolution in the UV and SMF of LAEs. The UV luminosity density (ρUV) of the full sample of LAEs shows moderate evolution and the stellar mass density (ρM) decreases, with both being always lower than the total ρUV and ρM of more typical galaxies but slowly approaching them with increasing redshift. Overall, our results indicate that both ρUV and ρM of LAEs slowly approach the measurements of continuum-selected galaxies at z > 6, which suggests a key role of LAEs in the epoch of reionization.