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Discovery of an unusually compact lensed Lyman-break galaxy from the Hyper Suprime-Cam Survey

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Suyu,  Sherry H.
Physical Cosmology, MPI for Astrophysics, Max Planck Society;

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Citation

Jaelani, A. T., More, A., Sonnenfeld, A., Oguri, M., Rusu, C. E., Wong, K. C., et al. (2020). Discovery of an unusually compact lensed Lyman-break galaxy from the Hyper Suprime-Cam Survey. Monthly Notices of the Royal Astronomical Society, 494(3), 3156-3165. doi:10.1093/mnras/staa583.


Cite as: http://hdl.handle.net/21.11116/0000-0006-BD31-E
Abstract
We report the serendipitous discovery of HSC J0904–0102, a quadruply lensed Lyman-break galaxy (LBG) in the Survey of Gravitationally-lensed Objects in Hyper Suprime-Cam Imaging (SuGOHI). Owing to its point-like appearance, the source was thought to be a lensed active galactic nucleus. We obtained follow-up spectroscopic data with the Gemini Multi-Object Spectrographs on the Gemini South Telescope, which confirmed this to be a lens system. The deflecting foreground galaxy is a typical early-type galaxy at a high redshift of z=0.957 with stellar velocity dispersion σv=259±56 km s−1. The lensed source is identified as an LBG at zs=3.403⁠, based on the sharp drop bluewards of Lyα and other absorption features. A simple lens mass model for the system, assuming a singular isothermal ellipsoid, yields an Einstein radius of θEin=1.23 arcsec and a total mass within the Einstein radius of MEin=(5.55±0.24)×1011M corresponding to a velocity dispersion of σSIE=283±3 km s−1, which is in good agreement with the value derived spectroscopically. The most isolated lensed LBG image has a magnification of ∼6.5⁠. In comparison with other lensed LBGs and typical z∼4 LBG populations, HSC J0904–0102 is unusually compact, an outlier at >2σ confidence. Together with a previously discovered SuGOHI lens, HSC J1152+0047, which is similarly compact, we believe that the HSC survey is extending LBG studies down to smaller galaxy sizes.