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We report the discovery of an intrinsically faint, quintuply-imaged, dusty galaxy MACS0600-z6 at a redshift $z=$6.07 viewed through the cluster MACSJ0600.1-2008 ($z$=0.46). A $simeq4sigma$ dust detection is seen at 1.2mm as part of the ALMA Lensing Cluster Survey (ALCS), an on-going ALMA Large program, and the redshift is secured via [C II] 158 $mu$m emission described in a companion paper. In addition, spectroscopic follow-up with GMOS/Gemini-North shows a break in the galaxys spectrum, consistent with the Lyman break at that redshift. We use a detailed mass model of the cluster and infer a magnification $mugtrsim$30 for the most magnified image of this galaxy, which provides an unprecedented opportunity to probe the physical properties of a sub-luminous galaxy at the end of cosmic reionisation. Based on the spectral energy distribution, we infer lensing-corrected stellar and dust masses of $rm{2.9^{+11.5}_{-2.3}times10^9}$ and $rm{4.8^{+4.5}_{-3.4}times10^6}$ $rm{M_{odot}}$ respectively, a star formation rate of $rm{9.7^{+22.0}_{-6.6} M_{odot} yr^{-1}}$, an intrinsic size of $rm{0.54^{+0.26}_{-0.14}}$ kpc, and a luminosity-weighted age of 200$pm$100 Myr. Strikingly, the dust production rate in this relatively young galaxy appears to be larger than that observed for equivalent, lower redshift sources. We discuss if this implies that early supernovae are more efficient dust producers and the consequences for using dust mass as a probe of earlier star formation.
We present bright [CII] 158 $mu$m line detections from a strongly magnified and multiply-imaged ($musim20-160$) sub-$L^{*}$ ($M_{rm UV}$ = $-19.75^{+0.55}_{-0.44}$) Lyman-break galaxy (LBG) at $z=6.0719pm0.0004$ from the ALMA Lensing Cluster Survey (
We report the discovery of a multiply-imaged gravitationally lensed Type Ia supernova, iPTF16geu (SN 2016geu), at redshift $z=0.409$. This phenomenon could be identified because the light from the stellar explosion was magnified more than fifty times
The properties of galaxies at redshift $z>6$ hold the key to our understanding of the early stages of galaxy evolution and can potentially identify the sources of the ultraviolet radiation that give rise to the epoch of reionisation. The far-infrared
We study the kinematical properties of galaxies in the Epoch of Reionization via the [CII] 158$mu$m line emission. The line profile provides information on the kinematics as well as structural properties such as the presence of a disk and satellites.
Large surveys of galaxy clusters with the Hubble and Spitzer Space Telescopes, including CLASH and the Frontier Fields, have demonstrated the power of strong gravitational lensing to efficiently deliver large samples of high-redshift galaxies. We ext