Astrophysics Seminars

Hypervelocity stars leaving the Galaxy at ~1000 km/s are a natural consequence of a massive black hole in a dense stellar environment. In 2005 we discovered the first such hypervelocity star (HVS): a 3 solar mass B star, similar to stars seen in...

I will discuss recent hydrodynamic and emission models for the shock transition zone in Balmer-dominated SNRs. I will emphasize the role of atomic interactions in producing distinct populations of hot neutral hydrogen atoms, which emit the observed...

I will present various results based upon a synergistic methodology whose primary objective encompasses probing discrete gamma-ray burst (GRB) high-energy particle astrophysics via a broad-band, multi-messenger paradigm. The interface between...

The popular model for the formation of early-type galaxies is the hierarchical merging scenario. However, the details and frequency of merging are not yet known, particularly in dense environments. The high-mass end of the galaxy luminosity function...

In this talk I will discuss observations of ionized and neutral gas in the early-type galaxy NGC 2974. We extracted rotation curves both for the warm and cold gas, and applied the asymmetric drift correction to the velocities obtained from the...