Kavli Affiliate: Michael D. Gladders
| First 5 Authors: Guillaume Mahler, Keren Sharon, Matthew Bayliss, Lindsey. E. Bleem, Mark Brodwin
| Summary:
We report the results from a study of two massive ($M_{500c} > 6.0 times
10^{14} M_{odot}$) strong lensing clusters selected from the South Pole
Telescope cluster survey for their high Einstein radius ($R_E > 40”$),
SPT-CLJ2325$-$4111 and SPT-CLJ0049$-$2440. Ground-based and shallow HST imaging
indicated extensive strong lensing evidence in these fields, with giant arcs
spanning 18arcsec and 31arcsec, respectively, motivating further space-based
imaging followup. Here, we present multiband HST imaging and ground-based
Magellan spectroscopy of the fields, from which we compile detailed strong
lensing models. The lens models of SPT-CL,J2325$-$4111 and
SPT-CL,J0049$-$2440 were optimized using 9, and 8 secure multiple-imaged
systems with a final image-plane rms of 0farcs63 and 0farcs73, respectively.
From the lensing analysis, we measure the projected mass density within 500~kpc
of $M(<500 ~{rm kpc}) = 7.30pm0.07 times 10^{14}$$M_{odot}$, and $M(<500
~{rm kpc})=7.12^{+0.16}_{-0.19}times 10^{14}$ $M_{odot}$ for these two
clusters, and a sub-halos mass ratio of $0.12pm{0.01}$ and
$0.21^{+0.07}_{-0.05}$, respectively. Both clusters produce a large area with
high magnification ($mugeq 3$) for a source at $z=9$, $A^{lens}_{| mu | geq
3 }=4.93^{+0.03}_{-0.04} arcmin^2$, and $A^{lens}_{| mu | geq 3
}=3.64^{+0.14}_{-0.10} arcmin^2$ respectively, placing them in the top tier of
strong lensing clusters. We conclude that these clusters are spectacular
sightlines for further observations that will reduce the systematic
uncertainties due to cosmic variance. This paper provides the community with
two additional well-calibrated cosmic telescopes, as strong as the Frontier
Fields, suitable for studies of the highly magnified background Universe.
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