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
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 1.1mm with the AzTEC camera on the Large
Millimeter Telescope leaving no ambiguity in the counterpart identification.
This galaxy, MACS071_Az9, is at z>4 and the strong lensing model (mu=7.5)
allows us to calculate an intrinsic IR luminosity of 9.7e10 Lsun and an
obscured star formation rate of 14.6 +/- 4.5 Msun/yr. The unobscured star
formation rate from the UV is only 4.1 +/- 0.3 Msun/yr which means the total
star formation rate (18.7 +/- 4.5 Msun/yr) is dominated (75-80%) by the
obscured component. With an intrinsic stellar mass of only 6.9e9Msun,
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 (SMC) 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.
Description
[1703.04535] 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
%0 Generic
%1 pope2017early
%A Pope, Alexandra
%A Montana, Alfredo
%A Battisti, Andrew
%A Limousin, Marceau
%A Marchesini, Danilo
%A Wilson, Grant W.
%A Alberts, Stacey
%A Aretxaga, Itziar
%A Avila-Reese, Vladimir
%A Bermejo-Climent, Jose Ramon
%A Brammer, Gabriel
%A Bravo-Alfaro, Hector
%A Calzetti, Daniela
%A Chary, Ranga-Ram
%A Cybulski, Ryan
%A Giavalisco, Mauro
%A Hughes, David
%A Kado-Fong, Erin
%A Keller, Erica
%A Kirkpatrick, Allison
%A Labbe, Ivo
%A Lange-Vagle, Daniel
%A Lowenthal, James
%A Murphy, Eric
%A Oesch, Pascal
%A Gonzalez, Daniel Rosa
%A Sanchez-Arguelles, David
%A Shipley, Heath
%A Stefanon, Mauro
%A Vega, Olga
%A Whitaker, Katherine
%A Williams, Christina C.
%A Yun, Min
%A Zavala, Jorge A.
%A Zeballos, Milagros
%D 2017
%K detection high-z mm
%T 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
%U http://arxiv.org/abs/1703.04535
%X 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 1.1mm with the AzTEC camera on the Large
Millimeter Telescope leaving no ambiguity in the counterpart identification.
This galaxy, MACS071_Az9, is at z>4 and the strong lensing model (mu=7.5)
allows us to calculate an intrinsic IR luminosity of 9.7e10 Lsun and an
obscured star formation rate of 14.6 +/- 4.5 Msun/yr. The unobscured star
formation rate from the UV is only 4.1 +/- 0.3 Msun/yr which means the total
star formation rate (18.7 +/- 4.5 Msun/yr) is dominated (75-80%) by the
obscured component. With an intrinsic stellar mass of only 6.9e9Msun,
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 (SMC) 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.
@misc{pope2017early,
abstract = {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 1.1mm with the AzTEC camera on the Large
Millimeter Telescope leaving no ambiguity in the counterpart identification.
This galaxy, MACS071_Az9, is at z>4 and the strong lensing model (mu=7.5)
allows us to calculate an intrinsic IR luminosity of 9.7e10 Lsun and an
obscured star formation rate of 14.6 +/- 4.5 Msun/yr. The unobscured star
formation rate from the UV is only 4.1 +/- 0.3 Msun/yr which means the total
star formation rate (18.7 +/- 4.5 Msun/yr) is dominated (75-80%) by the
obscured component. With an intrinsic stellar mass of only 6.9e9Msun,
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 (SMC) 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.},
added-at = {2017-03-16T11:06:27.000+0100},
author = {Pope, Alexandra and Montana, Alfredo and Battisti, Andrew and Limousin, Marceau and Marchesini, Danilo and Wilson, Grant W. and Alberts, Stacey and Aretxaga, Itziar and Avila-Reese, Vladimir and Bermejo-Climent, Jose Ramon and Brammer, Gabriel and Bravo-Alfaro, Hector and Calzetti, Daniela and Chary, Ranga-Ram and Cybulski, Ryan and Giavalisco, Mauro and Hughes, David and Kado-Fong, Erin and Keller, Erica and Kirkpatrick, Allison and Labbe, Ivo and Lange-Vagle, Daniel and Lowenthal, James and Murphy, Eric and Oesch, Pascal and Gonzalez, Daniel Rosa and Sanchez-Arguelles, David and Shipley, Heath and Stefanon, Mauro and Vega, Olga and Whitaker, Katherine and Williams, Christina C. and Yun, Min and Zavala, Jorge A. and Zeballos, Milagros},
biburl = {https://www.bibsonomy.org/bibtex/2887528a9d538cce8fa3006957d71f60b/miki},
description = {[1703.04535] 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},
interhash = {a76c814da919e0626e9773627006a158},
intrahash = {887528a9d538cce8fa3006957d71f60b},
keywords = {detection high-z mm},
note = {cite arxiv:1703.04535Comment: 12 pages, 6 figures, accepted for publication in ApJ},
timestamp = {2017-03-16T11:06:27.000+0100},
title = {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},
url = {http://arxiv.org/abs/1703.04535},
year = 2017
}