A Triple Rollover: A third multiply-imaged source at z~6 behind the Jackpot gravitational lens. (arXiv:2004.00649v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Collett_T/0/1/0/all/0/1">Thomas E. Collett</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Smith_R/0/1/0/all/0/1">Russell J. Smith</a>
Using deep integral-field spectroscopy with MUSE, we have identified a
doubly-imaged Ly alpha source at redshift 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 lensing
models for J0946+1006 successfully map the two new observed images to a common
point on the z=5.975 source plane. The new source will provide further
constraints on the mass distribution in the lens and in the two previously
known sources. The third source also probes two new distance scaling factors
which are sensitive to the cosmological parameters of the Universe. We show
that detection of a new multiply imaged emission-line source is not unexpected
in observations of this depth; similar data for other known lenses should
reveal a larger sample of multiple-image-plane systems for cosmography and
other applications.
Using deep integral-field spectroscopy with MUSE, we have identified a
doubly-imaged Ly alpha source at redshift 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 lensing
models for J0946+1006 successfully map the two new observed images to a common
point on the z=5.975 source plane. The new source will provide further
constraints on the mass distribution in the lens and in the two previously
known sources. The third source also probes two new distance scaling factors
which are sensitive to the cosmological parameters of the Universe. We show
that detection of a new multiply imaged emission-line source is not unexpected
in observations of this depth; similar data for other known lenses should
reveal a larger sample of multiple-image-plane systems for cosmography and
other applications.
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