Kavli Affiliate: Michael D. Gladders
| First 5 Authors: Yunchong Zhang, Viraj Manwadkar, Michael D. Gladders, Gourav Khullar, Håkon Dahle
| Summary:
We report the discovery of five bright strong gravitationally lensed galaxies
at $3 < z < 4$: COOLJ0101$+$2055 ($z = 3.459$), COOLJ0104$-$0757 ($z = 3.480$),
COOLJ0145$+$1018 ($z = 3.310$), COOLJ0516$-$2208 ($z = 3.549$), and
COOLJ1356$+$0339 ($z = 3.753$). These galaxies have magnitudes of $r_{rm AB},
z_{rm AB} < 21.81$ mag and are lensed by galaxy clusters at $0.26 < z < 1$.
This sample nearly doubles the number of known bright lensed galaxies with
extended arcs at $3 < z < 4$. We characterize the lensed galaxies using
ground-based grz/giy imaging and optical spectroscopy. We report model-based
magnitudes and derive stellar masses, dust content, and star-formation rates
via stellar population synthesis modeling. Building lens models based on
ground-based imaging, we estimate source magnifications in the range $sim$29
to $sim$180. Combining these analyses, we derive demagnified stellar masses in
the range $rm log_{10}(M_{*}/M_{odot}) sim 9.69 – 10.75$ and star formation
rates in the youngest age bin ranging from $rm log_{10}(SFR/(M_{odot}cdot
yr^{-1})) sim 0.39 – 1.46$, placing the sample galaxies on the massive end of
the star-forming main sequence in this redshift interval. In addition, three of
the five galaxies have strong Ly$alpha$ emissions, offering unique
opportunities to study Ly$alpha$ emitters at high redshift in future work.
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