30 Apr 2015

  • (abs, pdf) Koposov et al., Kinematics and chemistry of recently discovered Reticulum 2 and Horologium 1 dwarf galaxies
  • (abs, pdf) Zitrin et al., A Pilot Survey for CIII] Emission in the Reionization Era: Gravitationally-Lensed z$\sim7-8$ Galaxies in the Frontier Fields Cluster Abell 2744
  • (abs, pdf) Smith et al., The First Population II Stars Formed in Externally Enriched Mini-halos
  • (abs, pdf) Russell et al., Inside the Bondi radius of M87

New Paper: The First Metal-Enriched Stars

Today, we have submitted a new paper on the formation of the first metal-enriched stars. We concentrate on the scenario where an external supernova blastwave enriches a nearby halo to 1/30,000th of the solar metallicity, sparking the gravitational collapse of the gas that can cool through molecular hydrogen formation on newly-formed dust grains. See the movie below for a full tour of the simulation’s evolution.

The First Pop II Star from Britton Smith on Vimeo.

This work significantly improves on previous efforts that only considered non-cosmological simulations or a uniformly enriched medium. Our simulations include coupled radiative feedback from Population III massive stars and their supernova, following the metal enrichment from the explosion site to the subsequent star forming region. We find that cooling through dust grains enhances fragmentation during the collapse, suggesting that the most metal-poor stars are the result of incomplete mixing. For more images and details, see Britton Smith’s webpage on the paper.

29 Apr 2015

  • (abs, pdf) Penzo et al., Effects of Coupled Dark Energy on the Milky Way and its Satellites
  • (abs, pdf) Cen, Coevolution Between Supermassive Black Holes and Bulges Is Not Via Internal Feedback Regulation But By Rationed Gas Supply Due To Angular Momentum Distribution
  • (abs, pdf) Roth et al., Genetically modified halos: towards controlled experiments in $\Lambda$CDM galaxy formation
  • (abs, pdf) Ross et al., Metallicity Distribution Functions of Four Local Group dwarf galaxies
  • (abs, pdf) Chiaki & Yoshida, Particle splitting in smoothed particle hydrodynamics based on Voronoi diagram

28 Apr 2015

  • (abs, pdf) Feng et al., The formation of Milky Way-mass disk galaxies in the first 500 million years of a cold dark matter universe
  • (abs, pdf) Feng et al., The BlueTides Simulation: First Galaxies and Reionization
  • (abs, pdf) Boylan-Kolchin et al., The Local Group as a time machine: studying the high-redshift Universe with nearby galaxies
  • (abs, pdf) Stark et al., Spectroscopic detection of CIV in a galaxy at z=7.045: Implications for the ionizing spectra of reionization-era galaxies