A highly magnified star at redshift 6.2

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  • Brian Welch
  • Dan Coe
  • Jose M. Diego
  • Adi Zitrin
  • Erik Zackrisson
  • Paola Dimauro
  • Yolanda Jimenez-Teja
  • Patrick Kelly
  • Guillaume Mahler
  • Masamune Oguri
  • F. X. Timmes
  • Rogier Windhorst
  • Michael Florian
  • S. E. de Mink
  • Roberto J. Avila
  • Jay Anderson
  • Larry Bradley
  • Keren Sharon
  • Anton Vikaeus
  • Stephan McCandliss
  • Marusa Bradac
  • Jane Rigby
  • Brenda Frye
  • Michele Trenti
  • Soniya Sharma
  • Felipe Andrade-Santos
  • Tom Broadhurst

Galaxy clusters magnify background objects through strong gravitational lensing. Typical magnifications for lensed galaxies are factors of a few but can also be as high as tens or hundreds, stretching galaxies into giant arcs(1,2). Individual stars can attain even higher magnifications given fortuitous alignment with the lensing cluster. Recently, several individual stars at redshifts between approximately 1 and 1.5 have been discovered, magnified by factors of thousands, temporarily boosted by microlensing(3-6). Here we report observations of a more distant and persistent magnified star at a redshift of 6.2 +/- 0.1, 900 million years after the Big Bang. This star is magnified by a factor of thousands by the foreground galaxy cluster lens WHL0137-08 (redshift 0.566), as estimated by four independent lens models. Unlike previous lensed stars, the magnification and observed brightness (AB magnitude, 27.2) have remained roughly constant over 3.5 years of imaging and follow-up. The delensed absolute UV magnitude, -10 +/- 2, is consistent with a star of mass greater than 50 times the mass of the Sun. Confirmation and spectral classification are forthcoming from approved observations with the James Webb Space Telescope.

Original languageEnglish
JournalNature
Volume603
Issue number7903
Pages (from-to)815-818
ISSN0028-0836
DOIs
Publication statusPublished - 2022

    Research areas

  • MASS-DISTRIBUTION, GALAXIES, STELLAR, RELICS, EVOLUTION, PHOTOMETRY, SPECTRUM

ID: 303675625