A triple rollover: a third multiply imaged source at z ≈ 6 behind the Jackpot gravitational lens

@article{Collett2020ATR,
  title={A triple rollover: a third multiply imaged source at z ≈ 6 behind the Jackpot gravitational lens},
  author={Thomas E. Collett and Russell J Smith},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2020},
  volume={497},
  pages={1654-1660}
}
Using a 5-h adaptive-optics-assisted observation with Multi-Unit Spectroscopic Explorer, we have identified a doubly imaged Ly α source at a redshift of 5.975 behind the z = 0.222 lens galaxy J0946+1006 (the ‘Jackpot’). The source separation implies an Einstein radius of ∼2.5 arcsec. Combined with the two previously known Einstein rings in this lens (radii 1.4 arcsec at z = 0.609 and 2.1 arcsec at z ≈ 2.4), this system is now a unique galaxy-scale triple-source-plane lens. We show that existing… 
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