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

@article{Kelly2017ExtremeMO,
  title={Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens},
  author={Patrick L. Kelly and Jose M. Diego and Steven A. Rodney and Nick Kaiser and Tom Broadhurst and Adi Zitrin and Tommaso Treu and Pablo G. P{\'e}rez-Gonz{\'a}lez and Takahiro Morishita and Mathilde Jauzac and Jonatan Selsing and Masamune Oguri and Laurent Pueyo and Timothy W. Ross and Alexei V. Filippenko and Nathan Smith and Jens Hjorth and S. Bradley Cenko and Xin Wang and D. Andrew Howell and Johan Richard and Brenda L. Frye and Saurabh W. Jha and Ryan J. Foley and Colin Norman and Maru{\vs}a Brada{\vc} and Wei Zheng and Gabriel B. Brammer and Alberto Molino Benito and Antonio Cava and Lise Christensen and Selma de Mink and Or Graur and Claudio Grillo and Ryota Kawamata and Jean-Paul Kneib and Thomas Matheson and Curtis McCully and Mario Nonino and Ismael P{\'e}rez-Fournon and Adam G. Riess and Piero Rosati and Kasper B. Schmidt and Keren Sharon and Benjamin J. Weiner},
  journal={Nature Astronomy},
  year={2017},
  volume={2},
  pages={334-342}
}
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… 
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  • J. Diego
  • Physics
    Astronomy & Astrophysics
  • 2019
Extreme magnifications of distant objects by factors of several thousand have recently become a reality. Small, very luminous compact objects, such as supernovae (SNe), giant stars at z = 1 − 2, Pop
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Recent observations of lensed galaxies at cosmological distances have detected individual stars that are extremely magnified when crossing the caustics of lensing clusters. In idealized cluster
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