English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a detailed analysis of an individual case of gravitational lensingof a $z\sim8$ Lyman-Break galaxy (LBG) in a blank field, identified in HubbleSpace Telescope imaging obtained as part of the Brightest of ReionizingGalaxies survey. To investigate the close proximity of the bright($m_{AB}=25.8$) $Y_{098}$-dropout to a small group of foreground galaxies, weobtained deep spectroscopy of the dropout and two foreground galaxies usingVLT/X-Shooter. We detect H-$\alpha$, H-$\beta$, [OIII] and [OII] emission inthe brightest two foreground galaxies (unresolved at the natural seeing of$0.8$ arcsec), placing the pair at $z=1.327$. We can rule out emission linescontributing all of the observed broadband flux in $H_{160}$ band at$70\sigma$, allowing us to exclude the $z\sim8$ candidate as a low redshiftinterloper with broadband photometry dominated by strong emission lines. Theforeground galaxy pair lies at the peak of the luminosity, redshift andseparation distributions for deflectors of strongly lensed $z\sim8$ objects,and we make a marginal detection of a demagnified secondary image in thedeepest ($J_{125}$) filter. We show that the configuration can be accuratelymodelled by a singular isothermal ellipsoidal deflector and a S\'{e}rsic sourcemagnified by a factor of $\mu=4.3\pm0.2$. The reconstructed source in thebest-fitting model is consistent with luminosities and morphologies of $z\sim8$LBGs in the literature. The lens model yields a group mass of$9.62\pm0.31\times10^{11} M_{\odot}$ and a stellar mass-to-light ratio for thebrightest deflector galaxy of $M_{\star}/L_{B}=2.3^{+0.8}_{-0.6}M_{\odot}/L_{\odot}$ within its effective radius. The foreground galaxies'redshifts would make this one of the few strong lensing deflectors discoveredat $z>1$.

A spectroscopically confirmed z=1.327 galaxy-scale deflector magnifying a z~8 Lyman-Break galaxy in the Brightest of Reionizing Galaxies survey