ALMA Lensing Cluster Survey: A strongly lensed multiply imaged dusty system at z ≥ 6
Artikel i vetenskaplig tidskrift, 2021

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 programme, 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 reionization. Based on the spectral energy distribution, we infer lensing-corrected stellar and dust masses of 2.9-2.3+115 × 109 and 4.8-3.4+45 × 106 M☉, respectively, a star formation rate of 9.7-6.6+220 M☉ yr−1, an intrinsic size of 0.54-0.14+026 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.

Galaxies: formation

Galaxies: high-redshift

Galaxies: evolution

Gravitational lensing: strong


N. Laporte

University of Cambridge

A. Zitrin

Ben-Gurion University of the Negev

R. S. Ellis

University College London (UCL)

S. Fujimoto

Cosmic Dawn Center (DAWN)

G. Brammer

Cosmic Dawn Center (DAWN)

J. Richard

Centre national de la recherche scientifique (CNRS)

M. Oguri

Research Center for the Early Universe

University of Tokyo

G. B. Caminha

Rijksuniversiteit Groningen

K. Kohno

Research Center for the Early Universe

University of Tokyo

Y. Yoshimura

University of Tokyo

Y. Ao

University of Science and Technology of China

Chinese Academy of Sciences

F. E. Bauer

Pontificia Universidad Catolica de Chile

Instituto Milenio de Astrofísica

Karina I. Caputi

Cosmic Dawn Center (DAWN)

Rijksuniversiteit Groningen

E. Egami

University of Arizona

D. Espada

National Astronomical Observatory of Japan

SKA Organisation

The Graduate University for Advanced Studies (SOKENDAI)

J. González-López

Las Campanas Observatory

Universidad Diego Portales

B. Hatsukade

University of Tokyo

Kirsten Kraiberg Knudsen

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

M. M. Lee


Georgios E. Magdis

Cosmic Dawn Center (DAWN)

Masami Ouchi

University of Tokyo

F. Valentino

Cosmic Dawn Center (DAWN)

T. Wang

National Astronomical Observatory of Japan

University of Tokyo

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 505 4 4838-4846


Subatomär fysik

Astronomi, astrofysik och kosmologi

Radiologi och bildbehandling



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