TY - JOUR
T1 - Early Science with the Large Millimeter Telescope
T2 - Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster
AU - Pope, Alexandra
AU - Montaña, Alfredo
AU - Battisti, Andrew
AU - Limousin, Marceau
AU - Marchesini, Danilo
AU - Wilson, Grant W.
AU - Alberts, Stacey
AU - Aretxaga, Itziar
AU - Avila-Reese, Vladimir
AU - Bermejo-Climent, José Ramón
AU - Brammer, Gabriel
AU - Bravo-Alfaro, Hector
AU - Calzetti, Daniela
AU - Chary, Ranga Ram
AU - Cybulski, Ryan
AU - Giavalisco, Mauro
AU - Hughes, David
AU - Kado-Fong, Erin
AU - Keller, Erica
AU - Kirkpatrick, Allison
AU - Labbe, Ivo
AU - Lange-Vagle, Daniel
AU - Lowenthal, James
AU - Murphy, Eric
AU - Oesch, Pascal
AU - Gonzalez, Daniel Rosa
AU - Sánchez-Argüelles, David
AU - Shipley, Heath
AU - Stefanon, Mauro
AU - Vega, Olga
AU - Whitaker, Katherine
AU - Williams, Christina C.
AU - Yun, Min
AU - Zavala, Jorge A.
AU - Zeballos, Milagros
N1 - Publisher Copyright:
© 2017. The American Astronomical Society. All rights reserved..
PY - 2017/4/1
Y1 - 2017/4/1
N2 - We 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 (μ = 7.5) allows us to calculate an intrinsic IR luminosity of 9.7 × 1010 L o and an obscured star formation rate of 14.6 ± 4.5 M o yr-1. The unobscured star formation rate from the UV is only 4.1 ± 0.3 M o yr-1, which means the total star formation rate (18.7 ± 4.5 M o yr-1) is dominated (75%-80%) by the obscured component. With an intrinsic stellar mass of only 6.9 × 109 M o, 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-β) 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.
AB - We 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 (μ = 7.5) allows us to calculate an intrinsic IR luminosity of 9.7 × 1010 L o and an obscured star formation rate of 14.6 ± 4.5 M o yr-1. The unobscured star formation rate from the UV is only 4.1 ± 0.3 M o yr-1, which means the total star formation rate (18.7 ± 4.5 M o yr-1) is dominated (75%-80%) by the obscured component. With an intrinsic stellar mass of only 6.9 × 109 M o, 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-β) 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.
KW - dust, extinction
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: star formation
KW - gravitational lensing: strong
KW - infrared: galaxies
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U2 - 10.3847/1538-4357/aa6573
DO - 10.3847/1538-4357/aa6573
M3 - Article
AN - SCOPUS:85017302790
SN - 0004-637X
VL - 838
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 137
ER -