%0 Generic %1 laporte2017reionization %A Laporte, Nicolas %A Ellis, Richard S. %A Boone, Frederic %A Bauer, Franz E. %A Quénard, David %A Roberts-Borsani, Guido W. %A Pelló, Roser %A Pérez-Fournon, Ismael %A Streblyanska, Alina %D 2017 %K alma dust high redshift %T Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy %U http://arxiv.org/abs/1703.02039 %X We report on the detailed analysis of a gravitationally-lensed Y-band dropout, A2744_YD4, selected from deep Hubble Space Telescope imaging in the Frontier Field cluster Abell 2744. Band 7 observations with the Atacama Large Millimeter Array (ALMA) indicate the proximate detection of a significant 1mm continuum flux suggesting the presence of dust for a star-forming galaxy with a photometric redshift of $z\simeq8$. Deep X-SHOOTER spectra confirms the high redshift identity of A2744_YD4 via the detection of Lyman $\alpha$ emission at a redshift $z$=8.38. The association with the ALMA detection is confirmed by the presence of OIII 88$\mu$m emission at the same redshift. Although both emission features are only significant at the 4 $\sigma$ level, we argue their joint detection and the positional coincidence with a high redshift dropout in the HST images confirms the physical association. Analysis of the available photometric data and the modest gravitational magnification ($\mu\simeq2$) indicates A2744_YD4 has a stellar mass of $\sim$ 2$\times$10$^9$ M$_ødot$, a star formation rate of $\sim20$ M$_ødot$/yr and a dust mass of $\sim$6$\times$10$^6$ M$_ødot$. We discuss the implications of the formation of such a dust mass only $\simeq$200 Myr after the onset of cosmic reionisation.

@misc{laporte2017reionization, abstract = {We report on the detailed analysis of a gravitationally-lensed Y-band dropout, A2744_YD4, selected from deep Hubble Space Telescope imaging in the Frontier Field cluster Abell 2744. Band 7 observations with the Atacama Large Millimeter Array (ALMA) indicate the proximate detection of a significant 1mm continuum flux suggesting the presence of dust for a star-forming galaxy with a photometric redshift of $z\simeq8$. Deep X-SHOOTER spectra confirms the high redshift identity of A2744_YD4 via the detection of Lyman $\alpha$ emission at a redshift $z$=8.38. The association with the ALMA detection is confirmed by the presence of [OIII] 88$\mu$m emission at the same redshift. Although both emission features are only significant at the 4 $\sigma$ level, we argue their joint detection and the positional coincidence with a high redshift dropout in the HST images confirms the physical association. Analysis of the available photometric data and the modest gravitational magnification ($\mu\simeq2$) indicates A2744_YD4 has a stellar mass of $\sim$ 2$\times$10$^9$ M$_{\odot}$, a star formation rate of $\sim20$ M$_{\odot}$/yr and a dust mass of $\sim$6$\times$10$^{6}$ M$_{\odot}$. We discuss the implications of the formation of such a dust mass only $\simeq$200 Myr after the onset of cosmic reionisation.}, added-at = {2017-03-08T10:01:28.000+0100}, author = {Laporte, Nicolas and Ellis, Richard S. and Boone, Frederic and Bauer, Franz E. and Quénard, David and Roberts-Borsani, Guido W. and Pelló, Roser and Pérez-Fournon, Ismael and Streblyanska, Alina}, biburl = {https://www.bibsonomy.org/bibtex/213f981684c84bc43feef1d9c6639dd77/miki}, description = {[1703.02039] Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy}, interhash = {8fa5df5b65bb72fed8e54fdeddf700eb}, intrahash = {13f981684c84bc43feef1d9c6639dd77}, keywords = {alma dust high redshift}, note = {cite arxiv:1703.02039Comment: Accepted for publication in ApJL}, timestamp = {2017-03-08T10:01:28.000+0100}, title = {Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy}, url = {http://arxiv.org/abs/1703.02039}, year = 2017 }