Early Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster
Wilson, Grant W.
Bermejo-Climent, José Ramón
Gonzalez, Daniel Rosa
Williams, Christina C.
Zavala, Jorge A.
AffiliationUniv Arizona, Steward Observ
galaxies: star formation
gravitational lensing: strong
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationEarly Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster 2017, 838 (2):137 The Astrophysical Journal
JournalThe Astrophysical Journal
Rights© 2017. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractWe directly detect dust emission in an optically detected, multiply imaged galaxy lensed by the Frontier Fields cluster MACSJ0717.5+3745. We detect two images of the same galaxy at 1.1 mm with the AzTEC camera on the Large Millimeter Telescope leaving no ambiguity in the counterpart identification. This galaxy, MACS0717_Az9, is at z > 4 and the strong lensing model (mu = 7.5) allows us to calculate an intrinsic IR luminosity of 9.7 x 10(10) L-circle dot and an obscured star formation rate of 14.6 +/- 4.5 M-circle dot yr(-1). The unobscured star formation rate from the UV is only 4.1 +/- 0.3 M-circle dot yr(-1), which means the total star formation rate (18.7 +/- 4.5 M-circle dot yr(-1)) is dominated (75%-80%) by the obscured component. With an intrinsic stellar mass of only 6.9 x 10(9) M circle dot, MACS0717_Az9 is one of only a handful of z. >. 4 galaxies at these lower masses that is detected in dust emission. This galaxy lies close to the estimated star formation sequence at this epoch. However, it does not lie on the dust obscuration relation (IRX-beta) for local starburst galaxies and is instead consistent with the Small Magellanic Cloud attenuation law. This remarkable lower mass galaxy, showing signs of both low metallicity and high dust content, may challenge our picture of dust production in the early universe.
VersionFinal published version
SponsorsUS National Science Foundation (NSF) via the University Radio Observatory program; University of Massachusetts, Amherst; HST Frontier Fields program; NASA [NAS5-26555]; CONACYT [CB-2011-01-1672, CB-2011-01-167281]; CNRS; CNES; NSF ; NASA through a grant from STScI [HST-AR-14302]; NASA through Hubble Fellowship - Space Telescope Science Institute [HF2-51368]; Mexican Science and Technology Funding Agency, CONACYT
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