Stephen Padin

KICP Senior member

Ph.D., University of Manchester, 1985
 
Contact Information
Phone: (773) 834-9786
Location: ERC 337
Email: spadinuchicago.edu
 
Research
South Pole Telescope by day

Image credit: Steve Padin
My research is in instrumentation for astronomy. I am interested in interferometry, optical & radio telescope design, and observations of the cosmic microwave background radiation.
Submilimeter-wave Astronomy
I was working on the design of CCAT, a 25-m submillimeter-wave telescope that will be located in Chile.
The Cosmic Microwave Background Radiation
I was the Project Manager for the South Pole Telescope (SPT), a 10-m off-axis Gregorian telescope equipped with a wide-field millimeter-wave bolometer camera. The SPT is surveying galaxy clusters using the Sunyaev-Zel'dovich effect, and will measure polarization of the cosmic microwave background radiation. It is located at the Amundsen-Scott South Pole Station in Antarctica. My main contribution to the SPT was the optical design, which is a classical Gregorian with a cold stop surrounding the secondary.

I was the Project Scientist for the Cosmic Background Imager (CBI), an interferometer array which measured the angular power spectrum of fluctuations in the 3K cosmic microwave background radiation. Our results confirmed the presence of a damping tail and high-order doppler peaks, which are key predictions of the standard Big Bang models. The CBI has thirteen 1-m antennas, with cooled receivers operating at a wavelength of 1 cm. It is located in the Atacama Desert at an altitude of 5000 m. My main contribution to the CBI was a 10-GHz bandwidth analog correlator.

Ongoing Scientific Projects:
 
Talks, Lectures, & Workshops

 
KICP Publications
2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2005 | 2004


Latest Journal Publications
  1. "A 2500 square-degree CMB lensing map from combined South Pole Telescope and Planck data", arXiv:1705.00743 (May 2017)
  2. "A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data", arXiv:1704.00884 (Apr 2017)
  3. "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)
  4. "CMB Polarization B-mode Delensing with SPTpol and Herschel", arXiv:1701.04396 (Jan 2017)
  5. "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)
  6. "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)
  7. "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)
  8. "A Measurement of the Cosmic Microwave Background Gravitational Lensing Potential from 100 Square Degrees of SPTpol Data", The Astrophysical Journal, Volume 810, Issue 1, article id. 50, 16 pp. (2015) (Sep 2015)
  9. "Measurements of Sub-degree B-mode Polarization in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data", The Astrophysical Journal, Volume 807, Issue 2, article id. 151, 18 pp. (2015) (Jul 2015)
  10. "A Measurement of Gravitational Lensing of the Cosmic Microwave Background by Galaxy Clusters Using Data from the South Pole Telescope", The Astrophysical Journal, Volume 806, Issue 2, article id. 247, 14 pp. (2015) (Jun 2015)
  11. "Measurements of E-Mode Polarization and Temperature-E-Mode Correlation in the Cosmic Microwave Background from 100 Square Degrees of SPTpol Data", The Astrophysical Journal, Volume 805, Issue 1, article id. 36, 18 pp. (2015) (May 2015)
  12. "Analysis of Sunyaev-Zel'dovich effect mass-observable relations using South Pole Telescope observations of an X-ray selected sample of low-mass galaxy clusters and groups", Monthly Notices of the Royal Astronomical Society, Volume 448, Issue 3, p.2085-2099 (Apr 2015)
  13. "VizieR Online Data Catalog: Galaxy clusters discovered in the SPT-SZ survey (Bleem+, 2015)", VizieR On-line Data Catalog: J/ApJS/216/27. Originally published in: 2015ApJS..216...27B (Mar 2015)
  14. "Measurement of Galaxy Cluster Integrated Comptonization and Mass Scaling Relations with the South Pole Telescope", The Astrophysical Journal, Volume 799, Issue 2, article id. 137, 14 pp. (2015) (Feb 2015)
  15. "A Measurement of Secondary Cosmic Microwave Background Anisotropies from the 2500 Square-degree SPT-SZ Survey", The Astrophysical Journal, Volume 799, Issue 2, article id. 177, 22 pp. (2015) (Feb 2015)
  16. "Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-Square-Degree SPT-SZ Survey", The Astrophysical Journal Supplement, Volume 216, Issue 2, article id. 27, 21 pp. (2015) (Feb 2015)
  17. "Mass Calibration and Cosmological Analysis of the SPT-SZ Galaxy Cluster Sample Using Velocity Dispersion σ v and X-Ray Y X Measurements", The Astrophysical Journal, Volume 799, Issue 2, article id. 214, 16 pp. (2015) (Feb 2015)
  18. "SPT-CL J2040-4451: An SZ-selected Galaxy Cluster at z = 1.478 with Significant Ongoing Star Formation", The Astrophysical Journal, Volume 794, Issue 1, article id. 12, 14 pp. (2014) (Oct 2014)
  19. "The Redshift Evolution of the Mean Temperature, Pressure, and Entropy Profiles in 80 SPT-Selected Galaxy Clusters", The Astrophysical Journal, Volume 794, Issue 1, article id. 67, 16 pp. (2014) (Oct 2014)
  20. "Optical Spectroscopy and Velocity Dispersions of Galaxy Clusters from the SPT-SZ Survey", The Astrophysical Journal, Volume 792, Issue 1, article id. 45, 17 pp. (2014) (Sep 2014)

Latest Conference Proceedings
  1. "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)
  2. "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)
  3. "SuperSpec: development towards a full-scale filter bank", Proceedings of the SPIE, Volume 9914, id. 99143K 9 pp. (2016) (Jul 2016)
  4. "Status of SuperSpec: a broadband, on-chip millimeter-wave spectrometer", Proceedings of the SPIE, Volume 9153, id. 91530M 16 pp. (2014) (Aug 2014)
  5. "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)
  6. "Performance and on-sky optical characterization of the SPTpol instrument", Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. Proceedings of the SPIE, Volume 8452, article id. 84521F, 15 pp. (2012) (Sep 2012)
  7. "SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope", Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. Proceedings of the SPIE, Volume 8452, article id. 84521E, 18 pp. (2012) (Sep 2012)
  8. "Feedhorn-coupled TES polarimeter camera modules at 150 GHz for CMB polarization measurements with SPTpol", Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. Proceedings of the SPIE, Volume 8452, article id. 84523A, 15 pp. (2012) (Sep 2012)
  9. "Design and characterization of 90 GHz feedhorn-coupled TES polarimeter pixels in the SPTPol camera", Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. Proceedings of the SPIE, Volume 8452, article id. 845239, 12 pp. (2012) (Sep 2012)
  10. "South Pole Telescope software systems: control, monitoring, and data acquisition", Software and Cyberinfrastructure for Astronomy II. Proceedings of the SPIE, Volume 8451, article id. 84510T, 11 pp. (2012) (Sep 2012)