Tim Linden

The Galactic Center Gamma-Ray Excess

The Milky Way Galactic Center

High Mass X-Ray Binaries


My reseach focuses on particle astrophysics, which is the study of how high-energy particles interact throughout the universe. Generally I use observations and models of the highest energy objects in our universe (like supernovae, neutron stars, and black holes) to understand how physics works at energies even higher than we can produce in particle accelerators on Earth. Sometimes my research works backwards, using our understanding of particle physics to determine how the largest objects in our universe work. Some of my key research interests involve dark matter, gamma-ray astronomy, the Galactic center of the Milky Way, pulsars, and high-mass X-Ray binaries.

Research Interests

Dark Matter

Dark Matter is 6x as prevalent as all the visible matter in our universe. It doesn't interact with light. That's most of what we know.

Gamma-Ray Astronomy

Gamma-Rays are photons that have more than 1 million times as much energy as light we can see! I usually work with data from the Fermi-LAT telescope


Pulsars have a mass greater than our sun - but condensed into a region smaller than Manhattan! Oh, and they can also rotate 1000x per second.

Galactic Center

It is 4 light years between our sun and the nearest other star (Alpha Centauri), the Galactic Center has almost 1 million stars in that same volume.

X-Ray Binaries

Among the brightest X-Ray sources in the sky, these systems have a massive star that is losing mass onto either a neutron star or black hole.

Latest Results

TeV Halos

TeV electrons accelerated by pulsars may explain the diffuse TeV excess observed by Milagro.

Dark Kinetic Heating

Dark Matter collisions with neutron stars set a minimum neutron star temperature. This may be observable with next-generation instruments.

Star-Forming Galaxies

An analysis of 584 SFGs finds significant dispersion in their far-IR to gamma-ray correlation. SFGs significantly contribute to the IGRB.