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Research Interests

I am primarily interested in  high-energy astrophysics. I am currently researching Active Galactic Nuclei (AGN) accretion disks using X-ray spectroscopy with NuSTAR and Suzaku working with Dr. Laura Brenneman at the Harvard-Smithsonian Center for Astrophysics. The primary goal of this work is characterizing the properties of AGN accretion disk corona, absorbers, and, if possible, space-time near the central supermassive black hole for several X-ray bright AGN. Supermassive black hole spin can be deduced if highly-broadened reflection features are present in the AGN X-ray spectrum.

 I recently have been researching Blazars, a type of AGN that emits a high energy jet nearly straight at Earth, with Dr. Alan Marscher and the Blazar Research Group at Boston University.  Blazar's radiation, which is prominent across the entire electromagnetic spectrum, exhibits violent variability in brightness. Bright `knots' appear to move at superluminal speeds down blazar jets, an illusion caused by the jet orientation combined with near-light flow speeds. Supermassive black holes are thought to be the `central engines' that produce the jets. Using Very Long Baseline Interferometry (VLBI), a technique that combines radio antennas to create an effective continent-sized telescope, I made high resolution images of Blazar jets to study jet structure and the source of photons that get inverse-Compton scattered up to gamma-rays by electrons in the jet. 


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Copyright 2010 Thomson Reuters   

Co-Author Papers

"Gamma-Ray Energies in the Decay of 38Cl," K.S. Krane, M.L. Keck, E.B. Norman, and A.P. Shivprasad, Applied Radiation and Isotopes, (2011),     doi:10.1016/j.apradiso.2011.12.033