Laporte, N;
Zitrin, A;
Ellis, R;
Fujimoto, S;
Brammer, G;
Richard, J;
Oguri, M;
... Wang, T; + view all
(2021)
ALMA Lensing Cluster Survey: a strongly lensed multiply imaged dusty system at z ≥6.
Monthly Notices of the Royal Astronomical Society
10.1093/mnras/stab191.
(In press).
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Abstract
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 ≃ 4σ 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 μm emission described in a companion paper. In addition, spectroscopic follow-up with GMOS/Gemini-North shows a break in the galaxy’s spectrum, consistent with the Lyman break at that redshift. We use a detailed mass model of the cluster and infer a magnification μ ≳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 2.9+11.5−2.3×109 and 4.8+4.5−3.4×106 M⊙ respectively, a star formation rate of 9.7+22.0−6.6M⊙yr−1, an intrinsic size of 0.54+0.26−0.14 kpc, and a luminosity-weighted age of 200±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.
| Type: | Article |
|---|---|
| Title: | ALMA Lensing Cluster Survey: a strongly lensed multiply imaged dusty system at z ≥6 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab191 |
| Publisher version: | https://doi.org/10.1093/mnras/stab191 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10119895 |
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