27 Feb 2012

  • (abs, pdf) Davis et al., A Radiation Transfer Solver for Athena using Short Characteristics
  • (abs, pdf) Johnston et al., Probing the Halo From the Solar Vicinity to the Outer Galaxy: Connecting Stars in Local Velocity Structures to Large-Scale Clouds
  • (abs, pdf) Gabor & Davé, The Growth of Red Sequence Galaxies in a Cosmological Hydrodynamic Simulation
  • (abs, pdf) Wegg, Pseudo-Newtonian Potentials for Nearly Parabolic Orbits
  • (abs, pdf) Inayoshi & Omukai, Supermassive black hole formation by the cold accretion shocks in the first galaxies
  • (abs, pdf) Miralda-Escude, A star disrupted by a stellar black hole as the origin of the cloud falling towards the Galactic center

Talk: Extragalactic B-fields from Gamma Rays

Speaker: Tom Weisgarber (Chicago)

  • Voids: <1nG; filaments: ~0.3 µG; galaxies: ~1 µG; clusters: 10 µG.  No detections of B-fields in voids.
  • Gamma rays interact with the extragalactic background light (EBL) and create electron-positron pairs, which then cascade down to create more gamma rays. This cascade is then observed with some opening angle.  Pair production and inverse Compton scattering are the important processes in creating the cascades.
  • Semi-analytic model for the cascade: Huan+ (2011, ApJL 735, 28). Using the blazar RGB J0710+591, they constrain the B-field to be <3e-16 G (<3e-18 G for a 3 year livetime).

WREK Interview

A few weeks ago, I was interviewed by Charlie Bennett, who runs the North Avenue Lounge show on Georgia Tech’s student radio station.  I had a great time during the show. We chatted about my homecoming to Georgia Tech, my research, and the construction of the visualization lab for our group.  The show will be streaming until March 5th, so go listen!

22 Feb 2012

  • (abs, pdf) Leaman et al., The Resolved Structure and Dynamics of an Isolated Dwarf Galaxy: A VLT and Keck Spectroscopic Survey of WLM
  • (abs, pdf) Šurlan et al., 3-D Monte Carlo radiative transfer calculation of resonance line formation in the inhomogeneous expanding stellar wind
  • (abs, pdf) Banerjee et al., Generation of strong magnetic fields via the small-scale dynamo during the formation of the first stars
  • (abs, pdf) Limongi & Chieffi, Presupernova evolution and explosive nucleosynthesis of zero metal massive stars
  • (abs, pdf) Hobbs et al., Modelling supermassive black hole growth: towards an improved sub-grid prescription