Bradford A. Benson

Wilson Fellow and Associate Scientist at Fermi National Accelerator Laboratory; KICP Senior member

Ph.D., Physics, Stanford University, 2004
Contact Information
Phone: (773) 702-6452
Location: ERC 435
WWW: Web Site
At the South Pole.
I am an experimental cosmologist and mm-wavelength astronomer whose research focuses on studies of structure formation, and measurements of fine-scale cosmic microwave background (CMB) temperature and polarization anisotropy.

I am interested in the following questions: What is the nature of dark energy? What is the energy scale of Inflation? What is the mass of the neutrino? What was the nature of the first stars, galaxies, and active galactic nuclei in the universe? How did they affect the growth of cosmic structures?

Ongoing Scientific Projects:

Past Scientific Projects: Interferometric Sunyaev-Zel'dovich Effect Imaging Experiment (SZE)
KICP Highlights & News

Talks, Lectures, & Workshops

Past Students

UNDERGRADUATE: Alexander Droster (2017), Carina Baker (2014)
Currently in Committees
  • Conferences, Workshops and Visitors committee

KICP Publications
2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008

Latest Journal Publications
  1. "Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data", Monthly Notices of the Royal Astronomical Society, Volume 485, Issue 1, p.69-87 (May 2019)
  2. "First M87 Event Horizon Telescope Results. II. Array and Instrumentation", The Astrophysical Journal Letters, Volume 875, Issue 1, article id. L2, 28 pp. (2019) (Apr 2019)
  3. "First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole", The Astrophysical Journal Letters, Volume 875, Issue 1, article id. L1, 17 pp. (2019) (Apr 2019)
  4. "Anatomy of a Cooling Flow: The Feedback Response to Pure Cooling in the Core of the Phoenix Cluster", arXiv:1904.08942 (Apr 2019)
  5. "Sunyaev-Zel'dovich effect and X-ray scaling relations from weak lensing mass calibration of 32 South Pole Telescope selected galaxy clusters", Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, p.2871-2906 (Mar 2019)
  6. "Science from an Ultra-Deep, High-Resolution Millimeter-Wave Survey", arXiv:1903.03263 (Mar 2019)
  7. "Messengers from the Early Universe: Cosmic Neutrinos and Other Light Relics", arXiv:1903.04763 (Mar 2019)
  8. "The Future Landscape of High-Redshift Galaxy Cluster Science", arXiv:1903.05606 (Mar 2019)
  9. "Galaxy populations in the most distant SPT-SZ clusters. I. Environmental quenching in massive clusters at 1.4 ≲ z ≲ 1.7", Astronomy & Astrophysics, Volume 622, id.A117, 28 pp (Feb 2019)
  10. "Mass Calibration of Optically Selected DES Clusters Using a Measurement of CMB-cluster Lensing with SPTpol Data", The Astrophysical Journal, Volume 872, Issue 2, article id. 170, 14 pp. (2019) (Feb 2019)
  11. "Dark Energy Survey Year 1 results: Methodology and projections for joint analysis of galaxy clustering, galaxy lensing, and CMB lensing two-point functions", Physical Review D, Volume 99, Issue 2, id.023508 (Jan 2019)
  12. "Galaxy kinematics and mass calibration in massive SZE-selected galaxy clusters to z = 1.3", Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 1, p.1043-1061 (Jan 2019)
  13. "Spectroscopic Confirmation of Five Galaxy Clusters at z > 1.25 in the 2500 deg2 SPT-SZ Survey", The Astrophysical Journal, Volume 870, Issue 1, article id. 7, 16 pp. (2019) (Jan 2019)
  14. "X-Ray Properties of SPT-selected Galaxy Clusters at 0.2 < z < 1.5 Observed with XMM-Newton", The Astrophysical Journal, Volume 871, Issue 1, article id. 50, 26 pp. (2019) (Jan 2019)
  15. "A Detailed Study of the Most Relaxed SPT-selected Galaxy Clusters: Properties of the Cool Core and Central Galaxy", The Astrophysical Journal, Volume 870, Issue 2, article id. 85, 13 pp. (2019) (Jan 2019)
  16. "Cluster Cosmology Constraints from the 2500 deg$^2$ SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope", arXiv:1812.01679 (Dec 2018)
  17. "Dark Energy Survey Year 1 Results: A Precise H0 Estimate from DES Y1, BAO, and D/H Data", Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 3, p.3879-3888 (Nov 2018)
  18. "Maps of the Southern Millimeter-wave Sky from Combined 2500 deg2 SPT-SZ and Planck Temperature Data", The Astrophysical Journal Supplement Series, Volume 239, Issue 1, article id. 10, 14 pp. (2018) (Nov 2018)
  19. "Optical Characterization of the SPT-3G Camera", Journal of Low Temperature Physics, Volume 193, Issue 3-4, pp. 305-313 (Nov 2018)
  20. "Measurement of the Splashback Feature around SZ-selected Galaxy Clusters with DES, SPT and ACT", arXiv:1811.06081 (Nov 2018)

Latest Conference Proceedings
  1. "Broadband anti-reflective coatings for cosmic microwave background experiments", Proceedings of the SPIE, Volume 10708, id. 1070843 13 pp. (2018) (Jul 2018)
  2. "Characterization and performance of the second-year SPT-3G focal plane", Proceedings of the SPIE, Volume 10708, id. 107081Z 13 pp. (2018) (Jul 2018)
  3. "Year two instrument status of the SPT-3G cosmic microwave background receiver", Proceedings of the SPIE, Volume 10708, id. 1070803 21 pp. (2018) (Jul 2018)
  4. "X-ray Scaling Relations of SPT Selected Galaxy Clusters Observed with XMM-Newton", American Astronomical Society, AAS Meeting #229, id.404.09 (Jan 2017)
  5. "Integrated performance of a frequency domain multiplexing readout in the SPT-3G receiver", Proceedings of the SPIE, Volume 9914, id. 99141D 11 pp. (2016) (Jul 2016)
  6. "Large arrays of dual-polarized multichroic TES detectors for CMB measurements with the SPT-3G receiver", Proceedings of the SPIE, Volume 9914, id. 991417 11 pp. (2016) (Jul 2016)
  7. "Still Red and Dead? Measuring feedback and star-formation in clusters at z > 1", American Astronomical Society, AAS Meeting #228, id.118.07 (Jun 2016)
  8. "Sunyaev Zel'dovich Cluster Surveys", American Astronomical Society, HEAD meeting #14, id.102.01 (Aug 2014)
  9. "SPT-3G: a next-generation cosmic microwave background polarization experiment on the South Pole telescope", Proceedings of the SPIE, Volume 9153, id. 91531P 21 pp. (2014) (Jul 2014)
  10. "RedMaPPEr selected clusters from DES science verification data and their SPT-SZE signature", Building the Euclid Cluster Survey - Scientific Program, proceedings of a conference held July 6-11 2014 at the Sexten Center for Astrophysics. Online at, i

Past Visitors:
  1. Sebastian Bocquet, LMU Munich (2015)
  2. Fabian Koehlinger, Leiden Observatory (2015)
  3. Alexander van Engelen, Canadian Institute for Theoretical Astrophysics (2015)
  4. Rahlin Alexandra, Princeton University (2014)
  5. Neelima Sehgal, KIPAC, Stanford University (2011)