Andrey V. Kravtsov


Ph.D., Astronomy/Computer Science, New Mexico State University, 1999
Contact Information
Phone: (773)702-4249
Location: ERC 415
WWW: Web Site
CV: Curriculum Vitae
The formation of clusters and large-scale filaments in the Cold Dark Matter model with dark energy.
Cosmology, structure formation in the Universe, numerical simulations.

Study of structure formation in the Universe is an area of forefront research in astrophysics. The early evolution, when the seed fluctuations are small, can be calculated analitycally on a piece of paper without the help of large supercomputers. As the fluctuations grow in their amplitude, the evolution becomes too complex and theorists have to use computers to follow the subsequent evolution.

A typical simulation follows evolution of matter in a large box which expands at the same rate as the Universe itself. The box thus always encompasses the same mass. Over the period of time evolved in simulations the Universe expands by a factor of more than 50 and so does the simulation box (you can find a nice illustration of this here). In order to make it simpler to visualize the formation of structures, the expansion can be taken out so that the simulation box appears static. In professional lingo, the system of coordinates that expands (or co-moves) with the Universe is called the comoving coordinate system.

As the Universe expands, galaxies become more and more distant from each other. For an observer, such as ourselves, it appears that all other galaxies fly away from us. The further the galaxy, the faster it appears to recede. This recession affects the light emitted by the distant galaxies, stretching the wavelengths of emitted photons due to the Doppler redshift effect. The distance between galaxies is proportionalto the measure of this effect 1+z, where z is what astronomers call redshift. The redshift can be measured for each object if its spectrum is measured.

In addition, it takes a very long time (up to several billion years) for the light from the most distant galaxies and quasars to reach us. Not only the light we receive from these objects is redshifted, but we also see these objects as they were during the early stages in the evolution of the Universe. In this sense, the redshift z provides a universal clock and can be used as a measure of time. Observations of distant galaxies is much like a time travel into the past.

Ongoing Scientific Projects:
KICP Highlights & News

Talks, Lectures, & Workshops

Past Students

GRADUATE: Benedikt Diemer (2015), Denis Erkal (2013), Matthew Becker (2013), Samuel N. Leitner (2012), Gregory Vesper (2012), Hiroaki Oyaizu (2008), Douglas H. Rudd (2007), Jacqueline Chen (2006), Eduardo Rozo (2006), Daisuke Nagai (2005)

UNDERGRADUATE: Samuel Friedman (2004)
KICP Publications
2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002

Latest Journal Publications
  1. "The physical origin of long gas depletion times in galaxies", arXiv:1704.04239 (Apr 2017)
  2. "The splashback radius of halos from particle dynamics: II. Dependence on mass, accretion rate, redshift, and cosmology", arXiv:1703.09716 (Mar 2017)
  3. "The Halo Boundary of Galaxy Clusters in the SDSS", arXiv:1702.01722 (Feb 2017)
  4. "Star Cluster Formation in Cosmological Simulations. I. Properties of Young Clusters", The Astrophysical Journal, Volume 834, Issue 1, article id. 69, 16 pp. (2017) (Jan 2017)
  5. "Splashback Shells of Cold Dark Matter Halos", arXiv:1612.01531 (Dec 2016)
  6. "Quenching of Satellite Galaxies at the Outskirts of Galaxy Clusters", arXiv:1610.02644 (Oct 2016)
  7. "The role of penetrating gas streams in setting the dynamical state of galaxy clusters", Monthly Notices of the Royal Astronomical Society, Volume 461, Issue 1, p.412-432 (Sep 2016)
  8. "Cold Fronts and Shocks Formed by Gas Streams in Galaxy Clusters", arXiv:1609.05308 (Sep 2016)
  9. "Nonuniversal Star Formation Efficiency in Turbulent ISM", The Astrophysical Journal, Volume 826, Issue 2, article id. 200, 13 pp. (2016) (Aug 2016)
  10. "Cosmic shear measurements with Dark Energy Survey Science Verification data", Physical Review D, Volume 94, Issue 2, id.022002 (Jul 2016)
  11. "Detection of the Splashback Radius and Halo Assembly Bias of Massive Galaxy Clusters", The Astrophysical Journal, Volume 825, Issue 1, article id. 39, 20 pp. (2016) (Jul 2016)
  12. "Cosmology from cosmic shear with Dark Energy Survey Science Verification data", Physical Review D, Volume 94, Issue 2, id.022001 (Jul 2016)
  13. "The Impact of Stellar Feedback on the Structure, Size, and Morphology of Galaxies in Milky-Way-sized Dark Matter Halos", The Astrophysical Journal, Volume 824, Issue 2, article id. 79, 16 pp. (2016) (Jun 2016)
  14. "Column density profiles of multiphase gaseous haloes", Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 2, p.1164-1187 (May 2016)
  15. "On Detecting Halo Assembly Bias with Galaxy Populations", The Astrophysical Journal, Volume 819, Issue 2, article id. 119, 14 pp. (2016) (Mar 2016)
  16. "The Splashback Radius as a Physical Halo Boundary and the Growth of Halo Mass", The Astrophysical Journal, Volume 810, Issue 1, article id. 36, 16 pp. (2015) (Sep 2015)
  17. "The impact of stellar feedback on the structure, size and morphology of galaxies in Milky Way size dark matter haloes", arXiv:1509.00853 (Sep 2015)
  18. "On the Interplay between Star Formation and Feedback in Galaxy Formation Simulations", The Astrophysical Journal, Volume 804, Issue 1, article id. 18, 20 pp. (2015) (May 2015)
  19. "Preventing Star Formation in Early-Type Galaxies with Late-Time Stellar Heating", The Astrophysical Journal, Volume 803, Issue 2, article id. 77, 6 pp. (2015) (Apr 2015)
  20. "A Universal Model for Halo Concentrations", The Astrophysical Journal, Volume 799, Issue 1, article id. 108, 16 pp. (2015) (Jan 2015)

Latest Conference Proceedings
  1. "On detecting halo assembly bias with galaxy populations", American Astronomical Society, AAS Meeting #227, id.307.05 (Jan 2016)
  2. "The X-ray Surveyor Mission: a concept study", Proceedings of the SPIE, Volume 9601, id. 96010J 14 pp. (2015) (Aug 2015)
  3. "Cosmological Simulations of Galaxy Clusters: from Cores to Outskirts", Cosmological simulations: from galaxies to large scales, Proceedings of the conference held 29 June - 4 July, 2015 in Sesto (BZ) Italy. Online at:
  4. "Theoretical expectations for the properties of hot gas around galaxies and prospects for future detection", American Astronomical Society, HEAD meeting #14, id.401.03 (Aug 2014)
  5. "A High Throughput Workflow Environment for Cosmological Simulations", American Astronomical Society, AAS Meeting #221, id.#352.21 (Jan 2013)
  6. "Halo Occupation Properties of X-ray AGNs", American Astronomical Society, AAS Meeting #220, #524.06 (May 2012)
  7. "COsmic Sky MAchine (COSMA) For The Dark Energy Survey", American Astronomical Society, AAS Meeting #219, #248.13 (Jan 2012)
  8. "Baryon content of clusters and groups in the context of hierarchical cosmology", American Astronomical Society, AAS Meeting #218, #309.04; Bulletin of the American Astronomical Society, Vol. 43, 2011 (May 2011)
  9. "On the Kennicutt-Schmidt Relation of Low-Metallicity High-Redshift Galaxies", HUNTING FOR THE DARK: THE HIDDEN SIDE OF GALAXY FORMATION. Edited by Victor P. Debattista and Cristina C. Popescu AIP Conference Proceedings, Volume 1240, pp. 115-118 (2010) (Jun 2010)
  10. "Environmental dependence of the Kennicutt-Schmidt relation: implications for evolution of high-z galaxies", From Stars to Galaxies: Connecting our Understanding of Star and Galaxy Formation, University of Florida, Gainesville, Florida, USA, 7-10 April 2010. Online at, id.192 (Apr 2010)

Past Visitors:
  1. renato dupke, Univ. Michigan, Ann Arbor / Nat. Observatory, Brazil (2016)
  2. Andrew Hearin, Yale University (2016)
  3. Greg Stinson, MPIA (2014)
  4. Nicholas Battaglia, Carnegie Mellon University (2013)
  5. Peter Behroozi, Stanford University (2013)
  6. Shy Genel, Harvard-CfA (2013)
  7. Oleg Gnedin, University of Michigan (2013)
  8. Sam Leitner, University of Maryland (2013)
  9. Kate Rubin, MPIA (2013)
  10. Federico Sembolini, Universidad Autonoma de Madrid (Spain) (2013)
  11. Liang Yu, Yale University (2013)
  12. Anatoly Klypin, NMSU (2012)
  13. Niayesh Afshordi, Perimeter Institute/ University of Waterloo (2011)
  14. Megan Johnson, NRAO - Green Bank (2011)
  15. Douglas Rudd, Yale University (2011)
  16. David Weinberg, Ohio State University (2011)
  17. Charlie Conroy, Harvard-Smithsonian Center for Astrophysics (2010)
  18. Neal Dalal, Canadian Institute for Theoretical Astrophysics (2010)
  19. Ji-hoon Kim, KIPAC, Stanford University (2010)
  20. Douglas Rudd, Yale University (2010)
  21. Douglas Rudd, Institute for Advanced Study, Princeton (2010)
  22. Doug Watson, Vanderbilt University (2010)
  23. Markus Wetzstein, Princeton University (2010)
  24. Nadia Zakamska, Institute for Advanced Study, Princeton (2010)
  25. Marcel Zemp, University of Michigan (2010)
  26. Andrew Zentner, University of Pittsburgh (2010)
  27. Tom Abel, KIPAC, Stanford University (2009)
  28. Jonathan Tan, University of Florida (2009)
  29. Neal Dalal, Canadian Institute for Theoretical Astrophysics (2008)
  30. Tobias Goerdt, Racah Institute of Physics (2008)
  31. Natalia Ivanova, Canadian Institute for Theoretical Astrophysics (2008)
  32. Anatoly Klypin, New Mexico State University (2008)
  33. Yu Qingjuan, University of California, Santa Cruz (2008)
  34. Massimo Ricotti, University of Maryland (2008)
  35. Kyle Stewart, University of California, Irvine (2008)
  36. Hans Boehringer, Max-Planck-Institut fuer extraterr. Physik (2007)
  37. Daniel Ceverino, New Mexico State University (2007)
  38. August Evrard, University of Michigan (2007)
  39. Fabio Gastaldello, University of California, Irvine (2007)
  40. Marla Geha, Herzberg Institute of Astrophysics (2007)
  41. Stelios Kazantzidis, Stanford University (2007)
  42. Maxim Markevitch, Harvard-Smithsonian Center for Astrophysics (2007)
  43. Volker Mueller, Astrophysikalisches Institut Potsdam (2007)
  44. Dimitrios Psaltis, University of Arizona (2007)
  45. Michael Rauch, Carnegie Observatories (2007)
  46. Darren Reed, Los Alamos National Laboratory (2007)
  47. Frank van den Bosch, Max-Planck Institute for Astronomy (2007)
  48. Alexey Vikhlinin, Harvard-Smithsonian Center for Astrophysics (2007)
  49. Hu Zhan, University of California, Davis (2007)
  50. Kevork Abazajian, University of Maryland (2006)
  51. Darren Croton, University of California, Berkeley (2006)
  52. Anatoly Klypin, New Mexico State University (2006)
  53. Joel Primack, University of California, Santa Cruz (2006)
  54. Brant Robertson, Harvard-Smithsonian Center for Astrophysics (2006)
  55. James Bullock, University of California, Irvine (2005)
  56. Nick Gnedin, Fermi National Accelerator Laboratory (2005)
  57. Stelios Kazantzidis, University of Zurich (2005)
  58. Lucio Mayer, Institute of Astronomy, ETH Zurich (2005)
  59. Alexey Vikhlinin, Harvard-Smithsonian Center for Astrophysics (2005)
  60. Yago Ascasibar, Harvard-Smithsonian Center for Astrophysics (2004)
  61. David Hogg, New York University (2004)
  62. Stelios Kazantzidis, University of Zurich (2004)
  63. Francisco Prada, Isaac Newton Group of Telescopes (2004)
  64. Joel Primack, University of California, Santa Cruz (2004)
  65. James Bullock, Harvard-Smithsonian Center for Astrophysics (2003)
  66. Thomas Cox, University of California, Santa Cruz (2003)
  67. Nick Gnedin, University of Colorado (2003)
  68. Arieh Maller, University of Massachussetts (2003)
  69. Paul Oreto, Princeton University (2003)
  70. Alan Peel, University of California, Davis (2003)
  71. Jason Prochaska, University of California, Santa Cruz (2003)
  72. Anatoly Klypin, New Mexico State University (2002)
  73. Octavio Valenzuela, New Mexico State University (2002)
  74. Andrew Zentner, Ohio State University (2002)