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arXiv 2101.01740astro-ph.GAastro-ph.CO
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ALMA透镜星团巡天:$z\geq$ 6强透镜多重成像尘埃系统

ALMA Lensing Cluster Survey: a strongly lensed multiply imaged dusty system at $z\geq$6

N. Laporte, A. Zitrin, R. S. Ellis, S. Fujimoto, G. Brammer, J. Richard, M. Oguri, G. B. Caminha, K. Kohno, Y. Yoshimura, Y. Ao, F. E. Bauer, K. Caputi, E. Egam… 展开作者

N. Laporte, A. Zitrin, R. S. Ellis, S. Fujimoto, G. Brammer, J. Richard, M. Oguri, G. B. Caminha, K. Kohno, Y. Yoshimura, Y. Ao, F. E. Bauer, K. Caputi, E. Egami, D. Espada, J. González-López, B. Hatsukade, K. K. Knudsen, M. M. Lee, G. Magdis, M. Ouchi, F. Valentino, T. Wang

摘要:

我们报告发现了一个本质上暗淡的,五倍成像的,尘埃星系MACS 0600-z6在红移$z=$ 6.07通过集群MACS 0600.1 -2008($z$ =0.46)。一个$\simeq4σ$尘埃探测器在1.2毫米处被发现,这是ALMA透镜星团巡天(ALCS)的一部分,ALMA正在进行的大型项目,红移是通过在一篇配套论文中描述的[C II] 158 $μ$ m发射得到的。此外,GMOS/Gemini-North的光谱跟踪显示星系光谱中有一个断裂,与该红移处的莱曼断裂一致。我们使用一个详细的质量模型的集群和推断放大率$μ\gtrsim$ 30为最放大的图像,这个星系,这提供了一个前所未有的机会,探测宇宙再电离结束时的亚发光星系的物理特性。根据光谱能量分布,我们推断出经透镜校正的恒星质量和尘埃质量分别为$\rm{2.9^{+11.5}_{-2.3}\times10^9}$和$\rm{4.8^{+4.5}_{-3.4}\times10^6}$ $\rm{M_{\odot}}$,恒星形成速率为$\rm{9.7^{+22.0}_{-6.6} M_{\odot} yr^{-1}}$,内禀尺寸为$\rm{0.54^{+0.26}_{-0.14}}$ kpc,光度加权年龄为200 $\pm$ 1亿年。引人注目的是,这个相对年轻的星系中的尘埃产生率似乎比同等的低红移源所观察到的要大。我们讨论,如果这意味着早期的超新星更有效的尘埃生产商和使用尘埃质量作为早期恒星形成的探针的后果。

英文摘要:

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 $\simeq4σ$ 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 $μ$m 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\gtrsim$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.

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