Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy   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.

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The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc