Joshua A. Frieman

Theoretical Astrophysics Group, Fermilab; Professor, Dept. of Astronomy & Astrophysics

Ph.D., Physics, University of Chicago, 1985
Contact Information
Phone: (773)702-7971
Location: ERC 453
WWW: Web Site
The 2.5-meter telescope at Apache Point Observatory, named the Sloan Foundation Telescope in recognition of the pivotal and generous support of the Alfred P. Sloan Foundation through all phases of the SDSS.
Josh Frieman is a senior staff member (Scientist III) in the Theoretical Astrophysics group at Fermilab and the Fermilab Center for Particle Astrophysics. He is also Professor of Astronomy and Astrophysics at the University of Chicago, where he is a member of the Kavli Institute for Cosmological Physics.
Frieman earned a B.Sc. degree from Stanford (1981) and a PhD in Physics from the University of Chicago (1985). After a postdoc in the SLAC Theory Group, he joined the scientific staff at Fermilab in 1988. He served as Head of the Theoretical Astrophysics Group from 1994 to 1999. He is a Fellow of the American Physical Society and of the American Association for the Advancement of Science and a Trustee of the Aspen Center for Physics. He has served on the Executive Committee of the APS Divison of Astrophysics, on the Particle Physics Project Prioritization Panel (P5) of HEPAP, on the Astro 2010 Decadal Survey Committee, and on the Astronomy and Astrophysics Advisory Committee (AAAC).

Frieman's research centers on theoretical and observational cosmology, including studies of the nature of dark energy, the early Universe, gravitational lensing, the large-scale structure of the Universe, and supernovae as cosmological distance indicators. The author of over 230 publications, he led the Sloan Digital Sky Survey (SDSS-II) Supernova Survey, which discovered over 500 type Ia supernovae for cosmology studies, and served as chair of the SDSS Collaboration Council. He is a founder of and currently serves as Director of the Dark Energy Survey, a collaboration of over 120 scientists from 20 institutions on 3 continents, which is building a 570-Megapixel camera to carry out a wide-field survey on the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory in Chile to probe the origin of cosmic acceleration.

Ongoing Scientific Projects:

Past Scientific Projects: Sloan Digital Sky Survey (SDSS) | SDSS Supernova Survey (SDSS SS)
KICP Highlights & News

Talks, Lectures, & Workshops

Past Students

GRADUATE: Jennifer Helsby (2015), Alan Zablocki (2015), Felipe Marin (2010), Carlos E. Cunha (2008), Benjamin E. Dilday (2008), David Johnston (2003), Jonathan Mitchell (2003), Craig Wiegert (2003)

UNDERGRADUATE: Paul Williams (2015), Alex Lanzano (2013), Rebecca Pierce (2013)
Currently in Committees
  • Fellowship committee
  • Appointments committee
  • PFC Executive committee

KICP Publications
2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001

Latest Journal Publications
  1. "OzDES multifibre spectroscopy for the Dark Energy Survey: first-year operation and results", Monthly Notices of the Royal Astronomical Society, Volume 452, Issue 3, p.3047-3063 (Sep 2015)
  2. "Automated Transient Identification in the Dark Energy Survey", The Astronomical Journal, Volume 150, Issue 3, article id. 82, 15 pp. (2015) (Sep 2015)
  3. "The Phoenix stream: a cold stream in the Southern hemisphere", arXiv:1509.04283 (Sep 2015)
  4. "Discovery of a Stellar Overdensity in Eridanus-Phoenix in the Dark Energy Survey", arXiv:1509.04296 (Sep 2015)
  5. "The SDSS-IV eBOSS emission-line galaxy pilot survey", arXiv:1509.05045 (Sep 2015)
  6. "Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS", arXiv:1509.07121 (Sep 2015)
  7. "Discovery and Classification of DES15C2ir by SALT", The Astronomer's Telegram, #7973 (Sep 2015)
  8. "Search for Gamma-Ray Emission from DES Dwarf Spheroidal Galaxy Candidates with Fermi-LAT Data", The Astrophysical Journal Letters, Volume 809, Issue 1, article id. L4, 8 pp. (2015) (Aug 2015)
  9. "Optimizing spectroscopic and photometric galaxy surveys: same-sky benefits for dark energy and modified gravity", Monthly Notices of the Royal Astronomical Society, Volume 451, Issue 4, p.4424-4444 (Aug 2015)
  10. "Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey", arXiv:1508.03622 (Aug 2015)
  11. "Digging deeper into the Southern skies: a compact Milky-Way companion discovered in first-year Dark Energy Survey data", arXiv:1508.02381 (Aug 2015)
  12. "Discovery of two gravitationally lensed quasars in the Dark Energy Survey", arXiv:1508.01203 (Aug 2015)
  13. "No galaxy left behind: accurate measurements with the faintest objects in the Dark Energy Survey", arXiv:1507.08336 (Jul 2015)
  14. "Eight New Milky Way Companions Discovered in First-year Dark Energy Survey Data", The Astrophysical Journal, Volume 807, Issue 1, article id. 50, 16 pp. (2015) (Jul 2015)
  15. "Wide-field lensing mass maps from Dark Energy Survey science verification data: Methodology and detailed analysis", Physical Review D, Volume 92, Issue 2, id.022006 (Jul 2015)
  16. "Stellar Kinematics and Metallicities in the Ultra-faint Dwarf Galaxy Reticulum II", The Astrophysical Journal, Volume 808, Issue 1, article id. 95, 14 pp. (2015) (Jul 2015)
  17. "Wide-Field Lensing Mass Maps from Dark Energy Survey Science Verification Data", Physical Review Letters, Volume 115, Issue 5, id.051301 (Jul 2015)
  18. "The DES Science Verification Weak Lensing Shear Catalogs", arXiv:1507.05603 (Jul 2015)
  19. "Cosmic Shear Measurements with DES Science Verification Data", arXiv:1507.05598 (Jul 2015)
  20. "Cosmology from Cosmic Shear with DES Science Verification Data", arXiv:1507.05552 (Jul 2015)

Latest Conference Proceedings
  1. "Properties of type Ia supernovae inside rich galaxy clusters", XIV Latin American Regional IAU Meeting (Eds. A. Mateus, J. Gregorio-Hetem & R. Cid Fernandes) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 44, pp. 206-206 (2014) (Oct 2014)
  2. "The Dark Energy Survey and operations: Year 1", Proceedings of the SPIE, Volume 9149, id. 91490V 15 pp. (2014) (Aug 2014)
  3. "The Dark Energy Survey: Overview", American Astronomical Society, AAS Meeting #221, #335.01 (Jan 2013)
  4. "Correlations Between Type Ia Supernovae and Their Host Galaxies Using the SDSS and Multi-wavelength Photometry", American Astronomical Society, AAS Meeting #221, #106.06 (Jan 2013)
  5. "The Dark Energy Spectrometer: a potential multi-fiber instrument for the Blanco 4-meter Telescope", Ground-based and Airborne Instrumentation for Astronomy IV. Proceedings of the SPIE, Volume 8446, article id. 844656, 13 pp. (2012) (Sep 2012)
  6. "Dark Energy Spectrometer - A Proposed Multi-Fiber Instrument for the Blanco 4 Meter Telescope", American Astronomical Society, AAS Meeting #219, #422.09 (Jan 2012)
  7. "WFC3 and WFPC2 Follow Up of Strong Gravitational Lenses", American Astronomical Society, AAS Meeting #217, #347.03; Bulletin of the American Astronomical Society, Vol. 43, 2011 (Jan 2011)
  8. "SBAS: The Sloan Bright Arcs Survey", American Astronomical Society, AAS Meeting #217, #347.01; Bulletin of the American Astronomical Society, Vol. 43, 2011 (Jan 2011)
  9. "The Dark Energy Survey", American Astronomical Society, AAS Meeting #217, #205.01; Bulletin of the American Astronomical Society, Vol. 43, 2011 (Jan 2011)
  10. "Identifying Faint Supernovae in the SDSS-II SN Survey Data", American Astronomical Society, AAS Meeting #215, #430.21; Bulletin of the American Astronomical Society, Vol. 42, p.359 (Jan 2010)

Current & Future Visitors:
  1. Aurélien Benoit-Lévy, University College London / Institut d'Astrophysique de Paris
Past Visitors:
  1. Keith Bechtol, WIPAC / University of Wisconsin-Madison (2015)
  2. Chihway Chang, ETH Zurich (2015)
  3. Steve Kahn, Stanford National Accelerator Laboratory (2014)
  4. Brian Nord, Fermilab (2014)
  5. Natalie Roe, LBNL (2014)
  6. Florian Beutler, University of Western Australia (2012)
  7. Felipe Marin, Swinburne University (2011)
  8. Roberto Trotta, Imperial College London (2011)
  9. Felipe Marin, Swinburne University (2010)
  10. Tamara Davis, University of Queensland (2009)
  11. Renee Hlozek, University of Oxford (2009)
  12. Alexandra Abate, University College London (2008)
  13. Manda Banerji, University College London (2008)
  14. Alison Coil, University of California, San Diego (2008)
  15. Tamara Davis, University of Queensland (2008)
  16. Eanna Flanagan, Cornell University (2008)
  17. Marcelo Gleiser, Dartmouth College (2008)
  18. Ofer Lahav, University College London (2008)
  19. Julie McEnery, NASA, Goddard Space Flight Center (2008)
  20. Jean Quashnock, Carthage College (2007)
  21. Mat Smith, University of Portsmouth (2007)
  22. Joseph Zuntz, Imperial College, London (2007)
  23. Anna Cabre Albos, Institut d'Estudis Espacials de Catalunya (2006)
  24. David Cinabro, Wayne State University (2006)
  25. Rogerio Rosenfeld, Instituto de Fisica Teorica-UNESP (2006)
  26. Masao Sako, University of Pennsylvania (2006)
  27. Brandon Allgood, University of California, Santa Cruz (2005)
  28. Lifan Wang, Lawrence Berkeley National Laboratory (2005)
  29. Alexander Conley, University of California, Berkeley (2004)
  30. Masao Sako, Stanford University (2004)
  31. Roman Scoccimarro, New York University (2004)
  32. Andreas Berlind, New York University (2003)
  33. Enrique Gaztanaga, Instituto Nacional de Astrofisica (2002)
  34. Timothy McKay, University of Michigan (2002)
  35. Erin Sheldon, University of Michigan (2002)