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MHD Simulations of Accretion onto Sgr A*: Quiescent Fluctuations, Outbursts, and Quasi-Periodicity
Chi-kwan Chan, Siming Liu, Christopher L. Fryer +4
High resolution observations of Sgr A* have revealed a wide variety of phenomena, ranging from intense rapid flares to quasi-periodic oscillations, making this object an ideal syst…
A Radial Velocity Survey of the Cygnus OB2 Association
Daniel C. Kiminki, Henry A. Kobulnicky, K. Kinemuchi +7
We conducted a radial velocity survey of the Cygnus OB2 Association over a 6 year (1999 - 2005) time interval to search for massive close binaries. During this time we obtained 113…
Probing the Density in the Galactic Center Region: Wind-Blown Bubbles and High-Energy Proton Constraints
Christopher L. Fryer, Siming Liu, Gabriel Rockefeller +2
Recent observations of the Galactic center in high-energy gamma-rays (above 0.1TeV) have opened up new ways to study this region, from understanding the emission source of these hi…
Correlation between Flux and Spectral Index during Flares in Sagittarius A*
Jonathan M. Bittner, Siming Liu, Christopher L. Fryer +1
Flares in Sagittarius A* are produced by hot plasmas within a few Schwarzschild radii of the supermassive black hole at the Galactic center. The recent detection of a correlation b…
Collapsars in Three Dimensions
Gabriel Rockefeller, Christopher L. Fryer, Hui Li
We present the results of 3-dimensional simulations of the direct collapse to a black hole of a rotating, 60-solar-mass, zero metallicity, population III star. Because the structur…
Explosive Nucleosynthesis from GRB and Hypernova Progenitors: Direct Collapse versus Fallback
Christopher L. Fryer, Patrick A. Young, Aimee L. Hungerford
The collapsar engine behind long-duration gamma-ray bursts extracts the energy released from the rapid accretion of a collapsing star onto a stellar-massed black hole. In a collaps…