SPACE AND COSMIC RAY PHYSICS SEMINAR

University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, December 4, 2017
Coffee, Tea & Snacks 4:15-4:30 PM

Alice Harding
NASA Goddard Space Flight Center
Millisecond Pulsars, Positrons and the Galactic Bulge

Rotation-powered pulsars that spin at millisecond periods are prevalent in the Galaxy as radio, X-ray and gamma-ray pulsars. Fermi has discovered a population of gamma-ray millisecond pulsars (MSPs) in the disk and in globular clusters. Pulsars have been invoked to explain the local cosmic-ray positron excess, seen by AMS2, as well as the gamma-ray excess at the Galactic center seen by Fermi. I will discuss population synthesis simulations of radio and gamma-ray MSPs and the question of whether MSPs could account for the Galactic bulge excess. A population of MSP binaries thought to contain intra-binary shocks that accelerate positrons could also be contributing to the local positron excess.


Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Victoria at (301) 405-4811 or go to the UMD Space Physics group seminar web site.

There is free parking after 4:00 PM in lot B (the big parking garage across the street from the ATL building). There are a limited number of spaces in lot Q next to the new ATL wing with free parking after 4PM even when there is a basketball game on campus.