Daniel Schaerer

TL;DR: In this article, a comparison of plane-parallel non-LTE model atmospheres and comoving frame calculations is presented for massive Population III stars and stellar populations based on a recent stellar evolution tracks and up-to-date evolutionary synthesis models, with the aim to study their spectral properties, including their dependence on age, star formation history, and IMF.

TL;DR: In this paper, the authors presented a new set of synthesis models for stellar populations obtained with Starburst99 and based on new stellar evolutionary tracks with rotation, which results in pronounced changes in the integrated spectral energy distribution of a population containing massive stars.

TL;DR: In this paper, the authors used deep Hubble Space Telescope imaging of the Frontier Fields to accurately measure the galaxy rest-frame ultraviolet luminosity function (UV LF) in the redshift range z ∼ 6-8.

TL;DR: In this paper, the authors used the complete Hubble Space Telescope observations of the first HFF cluster A2744, and reported the detection of 50 galaxy candidates at z similar to 7 and eight candidates at Z similar to 8 in a total survey area of 0.96 arcmin(2) in the source plane.

TL;DR: In this article, the authors obtained deep spectroscopic observations of several nearby gamma-ray burst (GRB) host galaxies revealing the presence of Wolf-Rayet (WR) stars and numerous O stars located in rich and compact clusters or star forming regions.