John Webb

Public profile

John Webb
61 2 9385 5578
Postal Address: 
School of Physics, The University of New South Wales, SYDNEY, 2052, Australia School of Physics Directory:
61 2 9385 6060
Grouping Type: 
Associate Members

I lead the observational work at UNSW using high resolution spectroscopy of quasars to search for variations in the fundamental constants of Nature.
A popular article can be found here:

More information about our latest research can be found here:


Selected Publications

  • Limits on Variations in Fundamental Constants from 21-cm and Ultraviolet Quasar Absorption Lines, Tzanavaris, P.; Webb, J. K.; Murphy, M. T.; Flambaum, V. V.; Curran, S. J. Physical Review Letters, vol. 95, Issue 4, (2005)
  • The University of New South Wales Extrasolar Planet Search: methods and first results from a field centred on NGC 6633, Hidas, M. G.; Ashley, M. C. B.; Webb, J. K.; Irwin, M.; Phillips, A.; Toyozumi, H.; Derekas, Christiansen, J. L.; Nutto, C.; Crothers, S. Monthly Notices of the Royal Astronomical Society, Volume 360, Issue 2, (2005) 703-717
  • Deuterium/hydrogen in a new Lyman limit absorption system at z= 3.256 towards PKS1937-1009, Crighton, N. H. M.; Webb, J. K.; Ortiz-Gil, A.; Fernández-Soto, A. Monthly Notices of the Royal Astronomical Society, Volume 355, Issue 4, (2004) 1042-1052
  • Cosmological evolution of heavy-element and H2 abundances, Curran, S. J.; Webb, J. K.; Murphy, M. T.; Carswell, R. F. Monthly Notices of the Royal Astronomical Society, Volume 351, Issue 1, (2004) L24-L28
  • Cosmological variation of the deuteron binding energy, strong interaction, and quark masses from big bang nucleosynthesis, Dmitriev, V. F.; Flambaum, V. V.; Webb, J. K. Physical Review D, vol. 69, Issue 6, (2004)
  • Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra, Murphy, M. T.; Webb, J. K.; Flambaum, V. Monthly Notices of the Royal Astronomical Society, Volume 345, Issue 2, (2003) 609-638
  • A catalogue of damped Lyman alpha absorption systems and radio flux densities of the background quasars, S. J. Curran (UNSW), J. K. Webb (UNSW), M. T. Murphy (UNSW),R. Bandiera (Arcetri), E. Corbelli (Arcetri),V. V. Flambaum (UNSW) Comments: 26 Pages, 12 PS tables, 1 embedded table. Accepted by PASA. Continuously updated online catalogue available at
  • The Gaseous Extent of Galaxies and the Origin of Lya Absorption Systems. V. Optical and Near-Infrared Photometry of Lya-absorbing Galaxies at z < 1, Hsiao-Wen Chen (Carnegie Observatories), Kenneth M. Lanzetta (SUNY at Stony Brook), John K. Webb (UNSW), Xavier Barcons (Universidad de Cantabria) Astrophys.J. 559 (2001) 654-674
  • Could We Detect Molecular Oxygen in the Atmosphere of a Transiting Extra-Solar Earth-Like Planet? John K. Webb(UNSW), Imma Wormleaton(UNSW) Astron. Soc. Austr, 2001, 18, 252-258
  • Further Evidence for Cosmological Evolution of the Fine Structure Constant, J.K. Webb, M.T. Murphy, V.V. Flambaum, V.A. Dzuba, J.D. Barrow, C.W. Churchill, J.X. Prochaska, A.M. Wolfe Phys.Rev.Lett. 87 (2001) 091301



Member for
9 years 11 months