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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20170404T123000
DTEND;TZID=Atlantic/Canary:20170404T133000
UID:iactalks-1023
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1023
CREATED:2017-04-04T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Dust in the Reionization Era: ALMA Observations of a z = 8.38 Gravi
 tationally Lensed Galaxy
DESCRIPTION:Dust in the Reionization Era: ALMA Observations of a z = 8.38 G
 ravitationally Lensed Galaxy\nDr. Ismael Perez Fournon, Dr. Alina Streblya
 nska\n\nHow far can we see galaxies in the distant Universe? When are the 
 first metals and the first dust formed?We have now the first results on th
 ese topics (Laporte et al. 2017, ApJL, 837, 21L) based on the detailed ana
 lysis ofa gravitationally lensed Y-band dropout, A2744_YD4, selected from 
 deep Hubble Space Telescope imaging in the Frontier Fieldcluster Abell 274
 4. Band 7 observations with the Atacama Large Millimeter/submillimeter Arr
 ay (ALMA) indicate the proximatedetection of a significant 1 mm continuum 
 flux suggesting the presence of dust for a star-forming galaxy with a phot
 ometricredshift of z~8. Deep X-SHOOTER spectra confirms the high-redshift 
 identity of A2744_YD4 via the detection of Lyα emissionat a redshift
  z =8.38.  The association with the ALMA detection is confirmed by th
 e presence of [O III] 88 μm emission at thesame redshift.  Althoug
 h both emission features are only significant at the 4-sigma level, we arg
 ue their joint detection andthe positional coincidence with a high-redshif
 t dropout in the Hubble Space Telescope images confirms the physical assoc
 iation.Analysis of the available photometric data and the modest gravitati
 onal lensing magnification indicates A2744_YD4has a stellar mass of ∼2
  × 10^9 solar mass, a star formation rate of ∼20 solar mass_yr^â
 €‘1 and a dust mass of ∼6 × 10^6 solar mass.We discuss the impli
 cations of the formation of such a dust mass only ≃ 200 Myr after the on
 set of cosmic reionization.
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