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)
Talks, Lectures, & Workshops

Past Students

UNDERGRADUATE: Carina Baker (2014)
Currently in Committees
  • Wednesday Colloquium committee
  • Conferences, Workshops and Visitors committee

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

Latest Journal Publications
  1. "CMB Polarization B-mode Delensing with SPTpol and Herschel", The Astrophysical Journal, Volume 846, Issue 1, article id. 45, 17 pp. (2017) (Sep 2017)
  2. "Weak-lensing mass calibration of redMaPPer galaxy clusters in Dark Energy Survey Science Verification data", Monthly Notices of the Royal Astronomical Society, Volume 469, Issue 4, p.4899-4920 (Aug 2017)
  3. "A Measurement of CMB Cluster Lensing with SPT and DES Year 1 Data", arXiv:1708.01360 (Aug 2017)
  4. "Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing", arXiv:1708.01530 (Aug 2017)
  5. "Optical-SZE scaling relations for DES optically selected clusters within the SPT-SZ Survey", Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 3, p.3347-3360 (Jul 2017)
  6. "The Remarkable Similarity of Massive Galaxy Clusters from z ˜ 0 to z ˜ 1.9", The Astrophysical Journal, Volume 843, Issue 1, article id. 28, 15 pp. (2017) (Jul 2017)
  7. "Measurements of the Temperature and E-Mode Polarization of the CMB from 500 Square Degrees of SPTpol Data", arXiv:1707.09353 (Jul 2017)
  8. "CMB-S4 Technology Book, First Edition", arXiv:1706.02464 (Jun 2017)
  9. "A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite", arXiv:1706.10286 (Jun 2017)
  10. "High-frequency cluster radio galaxies: luminosity functions and implications for SZE-selected cluster samples", Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 3, p.3737-3750 (May 2017)
  11. "Testing for X-Ray-SZ Differences and Redshift Evolution in the X-Ray Morphology of Galaxy Clusters", The Astrophysical Journal, Volume 841, Issue 1, article id. 5, 11 pp. (2017) (May 2017)
  12. "A 2500 square-degree CMB lensing map from combined South Pole Telescope and Planck data", arXiv:1705.00743 (May 2017)
  13. "A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data", arXiv:1704.00884 (Apr 2017)
  14. "VizieR Online Data Catalog: SPT-SZ survey galaxy clusters optical spectroscopy (Ruel+, 2014)", VizieR On-line Data Catalog: J/ApJ/792/45. Originally published in: 2014ApJ...792...45R (Apr 2017)
  15. "Velocity Segregation and Systematic Biases In Velocity Dispersion Estimates with the SPT-GMOS Spectroscopic Survey", The Astrophysical Journal, Volume 837, Issue 1, article id. 88, 17 pp. (2017) (Mar 2017)
  16. "Alma Observations of Massive Molecular Gas Filaments Encasing Radio Bubbles in the Phoenix Cluster", The Astrophysical Journal, Volume 836, Issue 1, article id. 130, 9 pp. (2017) (Feb 2017)
  17. "Maps of the Magellanic Clouds from Combined South Pole Telescope and PLANCK Data", The Astrophysical Journal Supplement Series, Volume 227, Issue 2, article id. 23, 20 pp. (2016) (Dec 2016)
  18. "VizieR Online Data Catalog: Full spectroscopic data release of the SPT-GMOS (Bayliss+, 2016)", VizieR On-line Data Catalog: J/ApJS/227/3. Originally published in: 2016ApJS..227....3B (Nov 2016)
  19. "Cluster Mass Calibration at High Redshift: HST Weak Lensing Analysis of 13 Distant Galaxy Clusters from the South Pole Telescope Sunyaev-Zel'dovich Survey", arXiv:1611.03866 (Nov 2016)
  20. "Cosmological Constraints from Galaxy Clusters in the 2500 Square-degree SPT-SZ Survey", The Astrophysical Journal, Volume 832, Issue 1, article id. 95, 17 pp. (2016) (Nov 2016)

Latest Conference Proceedings
  1. "X-ray Scaling Relations of SPT Selected Galaxy Clusters Observed with XMM-Newton", American Astronomical Society, AAS Meeting #229, id.404.09 (Jan 2017)
  2. "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)
  3. "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)
  4. "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)
  5. "Sunyaev Zel'dovich Cluster Surveys", American Astronomical Society, HEAD meeting #14, id.102.01 (Aug 2014)
  6. "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)
  7. "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
  8. "The South Pole Telescope Cluster Survey", American Astronomical Society, AAS Meeting #223, id.135.02 (Jan 2014)
  9. "Probing the Stellar Content of High Redshift SPT Clusters", Tracing Cosmic Evolution with Clusters of Galaxies, a conference held 1-5 July, 2013 in Sexton, Italy. Online at, id.109 (Jul 2013)
  10. "Sunyaev-Zel'dovich Cluster Surveys: Latest Results and Future Prospects", Tracing Cosmic Evolution with Clusters of Galaxies, a conference held 1-5 July, 2013 in Sexton, Italy. Online at, id.30 (Jul 2013)

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)