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

Jaelani, Anton T.; More, Anupreeta; Sonnenfeld, Alessandro; Oguri, Masamune; Rusu, Cristian E.; Wong, Kenneth C.; Chan, James H. H.; Suyu, Sherry H.; Kayo, Issha; Lee, Chien-Hsiu; Inoue, Kaiki T.

doi:10.1093/mnras/staa583

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

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

MPS-Authors

/persons/resource/persons196332

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

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

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: https://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_ℓ=0.957 with stellar velocity dispersion σ_v=259±56 km s⁻¹. The lensed source is identified as an LBG at z_s=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 θ_Ein=1.23 arcsec and a total mass within the Einstein radius of M_Ein=(5.55±0.24)×10¹¹M_⊙ corresponding to a velocity dispersion of σ_SIE=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.