Stefan Westerhoff

Stefan Westerhoff is a professor of physics at the University of Wisconsin–Madison.  He is a member of the IceCube and the HAWC collaborations.  Primary research interests include the search for sources of high-energy cosmic rays and the study of the sky in gamma rays at TeV energies. Recent research includes the study of anisotropy in the arrival direction of cosmic rays with both IceCube and HAWC. Currently he is teaching High Energy Astrophysics and accepting inquiries for graduate and undergraduate research positions. More information about his research and courses is available on his personal webpage


Select Publications

Observation of Small-scale Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays with HAWC
HAWC Collaboration: A. U. Abeysekara et al
(Journal Article) Astrophys. J. 796 (2014) 108; DOI: 10.1088/0004-637X/796/2/108; e-print: arXiv:1408.4805 [astro-ph.HE]

Observation of Cosmic Ray Anisotropy with the IceTop Air Shower Array
IceCube Collaboration: M. G. Aartsen et al
(Journal Article) Astrophysical Journal 765 (2013) 55; e-print archive arXiv:1210.5278 [astro-ph.HE], 18 October 2012

A Bayesian Approach to Comparing Cosmic Ray Energy Spectra
S.Y. BenZvi, B.M. Connolly, C.G. Pfendner, S. Westerhoff
(Journal Article) Astrophysical Journal 738, 82 (2011) |

Observation of Anisotropy in the Arrival Directions of Galactic Cosmic Rays at Multiple Angular Scales with IceCube
IceCube Collaboration: R. Abbasi et al
(Journal Article) Astrophysical Journal 740 (2011) 16, 10 October 2011

The Highest-Energy Cosmic Rays
James J. Beatty and Stefan Westerhoff
(Journal Article) Ann. Rev. Nucl. Part. Sci. 59 (2009) 319. DOI: 10.1146/annurev.nucl.58.110707.171154

Honors and Awards

    • American Physical Society Fellow (2013)


(608) 890-0543
University of Wisconsin–Madison
Department of Physics
4209 Chamberlin Hall
Madison, Wisconsin 53706
222 W Washington Ave
5th floor, room 5412
Madison, WI 53703


Faculty Profiles

WIPAC faculty and students are involved in IceCube, the Askaryan Radio Array (ARA), the High-Altitude Water Cherenkov (HAWC) experiment, Cherenkov Telescope Array (CTA), Big Data, and DM-Ice.


In keeping with our vision, we encourage and support visits from researchers who have interests, or who wish to develop interests, in several of our research areas.


The postdoctoral fellowship program was created to honor the late John Bahcall, a prominent physicist and a founding member of the IceCube experiment.  In 2015 the Balzan Fellowship was created after Francis Halzen was awarded the Balzan Prize.