16 Aug 2016

  • (abs, pdf) Lofthouse et al., Major mergers are not significant drivers of star formation or morphological transformation around the epoch of peak cosmic star formation
  • (abs, pdf) Ma et al., The Structure and Dynamical Evolution of the Stellar Disk of a Simulated Milky Way-Mass Galaxy
  • (abs, pdf) Dugan et al., AGN Outflow Shocks on Bonnor-Ebert Spheres
  • (abs, pdf) Ashtekar & Gupt, Quantum Gravity in the Sky: Interplay between fundamental theory and observations

Solar Superstorms Video

During my visit to the NSF and US Senate, I was interviewed by the NSF for an educational video on solar storms and their effects. Take a look!

In a flash, all of your electronics could be gone, courtesy of a solar storm. However, a collaboration of National Science Foundation-funded scientists has created groundbreaking visualizations to help scientists and non-scientists alike understand these massive cosmic eruptions and develop ways to mitigate the disasters they could cause. These visualizations are available at no cost to educational institutions.

Original air date: July 18, 2016.

Credit: NSF

New Paper: Early X-ray Background

About a month ago, we submitted a new paper on the build-up of the X-ray radiation background. Here we used the Renaissance Simulations to estimate the number density of high-mass X-ray binaries from the first metal-free (Population III) stars. We found that these binaries produce about 6 eV of energy in the X-rays per hydrogen atom, potentially pre-heating the intergalactic medium to about 1000 K. These effects are important to consider when deciphering future 21-cm observations of the early universe that can tell us the last cosmic phase transition, reionization.

09 Aug 2016

  • (abs, pdf) Lehmann et al., SHOCKFIND – An algorithm to identify magnetohydrodynamic shock waves in turbulent clouds
  • (abs, pdf) Ceverino et al., Formation and Settling of a Disc Galaxy During the Last 8 Billion Years in a Cosmological Simulation
  • (abs, pdf) Rossi et al., Evolution of star cluster systems in isolated galaxies: first results from direct $N$-body simulations
  • (abs, pdf) Du et al., Substructure of fuzzy dark matter halos