Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens

  title={Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens},
  author={P. Kelly and J. Diego and S. Rodney and N. Kaiser and T. Broadhurst and A. Zitrin and T. Treu and P. P'erez-Gonz'alez and T. Morishita and M. Jauzac and J. Selsing and M. Oguri and L. Pueyo and T. Ross and A. Filippenko and N. Smith and J. Hjorth and S. Cenko and Xin Wang and D. Howell and J. Richard and B. Frye and S. Jha and R. Foley and C. Norman and M. Brada{\vc} and W. Zheng and G. Brammer and A. Benito and A. Cava and L. Christensen and S. E. Mink and O. Graur and C. Grillo and R. Kawamata and Jean-Paul Kneib and T. Matheson and C. Mccully and M. Nonino and I. P'erez-Fournon and A. Riess and P. Rosati and K. Schmidt and K. Sharon and B. Weiner},
  journal={Nature Astronomy},
  • P. Kelly, J. Diego, +42 authors B. Weiner
  • Published 2018
  • Physics
  • Nature Astronomy
  • Galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to ~50. Here we report an image of an individual star at redshift z = 1.49 (dubbed MACS J1149 Lensed Star 1) magnified by more than ×2,000. A separate image, detected briefly 0.26″ from Lensed Star 1, is probably a counterimage of the first star demagnified for multiple years by an object of ≳3 solar masses in the cluster. For reasonable assumptions about the lensing system, microlensing fluctuations in… CONTINUE READING
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