A multiply imaged luminous infrared galaxy behind the bullet cluster (1E0657-56)

Anthony H. Gonzalez; Douglas Clowe; Maruša Bradač; Dennis Zaritsky; Christine Jones; Maxim Markevitch

doi:10.1088/0004-637X/691/1/525

A multiply imaged luminous infrared galaxy behind the bullet cluster (1E0657-56)

Anthony H. Gonzalez
, Douglas Clowe
, Maruša Bradač
, Dennis Zaritsky
, Christine Jones
, Maxim Markevitch

Astronomy

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We present evidence for a Spitzer-selected luminous infrared galaxy (LIRG) behind the Bullet Cluster (1E0657-56). The galaxy, originally identified as a multiply imaged source using Infrared Array Camera (IRAC) photometry, has a spectral energy distribution consistent with a highly extincted (A_V ∼ 3.3), strongly star forming galaxy at z = 2.7. Using our strong gravitational lensing model presented in a previous paper, we find that the magnifications are |μ| ≈ 10-50 for the three images of the galaxy. The brightest and faintest images differ by a factor of 3.2 in magnification. The implied infrared luminosity is consistent with the galaxy being a LIRG, with a stellar mass of M_®* ∼ 2 × 10¹⁰ M _® and a star formation rate (SFR) of ∼90 M_® yr^-1. With lensed fluxes at 24 μm of 0.58 mJy and 0.39 mJy in the two brightest images, this galaxy presents a unique opportunity for detailed study of an obscured starburst with a SFR comparable to that of L* galaxies at z > 2.

Original language	English (US)
Pages (from-to)	525-530
Number of pages	6
Journal	Astrophysical Journal
Volume	691
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/691/1/525
State	Published - Jan 20 2009

Keywords

galaxies: clusters: general
galaxies: evolution
galaxies: starburst
gravitational lensing

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/691/1/525

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title = "A multiply imaged luminous infrared galaxy behind the bullet cluster (1E0657-56)",

abstract = "We present evidence for a Spitzer-selected luminous infrared galaxy (LIRG) behind the Bullet Cluster (1E0657-56). The galaxy, originally identified as a multiply imaged source using Infrared Array Camera (IRAC) photometry, has a spectral energy distribution consistent with a highly extincted (AV ∼ 3.3), strongly star forming galaxy at z = 2.7. Using our strong gravitational lensing model presented in a previous paper, we find that the magnifications are |μ| ≈ 10-50 for the three images of the galaxy. The brightest and faintest images differ by a factor of 3.2 in magnification. The implied infrared luminosity is consistent with the galaxy being a LIRG, with a stellar mass of M{\textregistered}* ∼ 2 × 1010 M {\textregistered} and a star formation rate (SFR) of ∼90 M{\textregistered} yr-1. With lensed fluxes at 24 μm of 0.58 mJy and 0.39 mJy in the two brightest images, this galaxy presents a unique opportunity for detailed study of an obscured starburst with a SFR comparable to that of L* galaxies at z > 2.",

keywords = "galaxies: clusters: general, galaxies: evolution, galaxies: starburst, gravitational lensing",

author = "Gonzalez, \{Anthony H.\} and Douglas Clowe and Maru{\v s}a Brada{\v c} and Dennis Zaritsky and Christine Jones and Maxim Markevitch",

year = "2009",

month = jan,

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doi = "10.1088/0004-637X/691/1/525",

language = "English (US)",

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T1 - A multiply imaged luminous infrared galaxy behind the bullet cluster (1E0657-56)

AU - Gonzalez, Anthony H.

AU - Clowe, Douglas

AU - Bradač, Maruša

AU - Zaritsky, Dennis

AU - Jones, Christine

AU - Markevitch, Maxim

PY - 2009/1/20

Y1 - 2009/1/20

N2 - We present evidence for a Spitzer-selected luminous infrared galaxy (LIRG) behind the Bullet Cluster (1E0657-56). The galaxy, originally identified as a multiply imaged source using Infrared Array Camera (IRAC) photometry, has a spectral energy distribution consistent with a highly extincted (AV ∼ 3.3), strongly star forming galaxy at z = 2.7. Using our strong gravitational lensing model presented in a previous paper, we find that the magnifications are |μ| ≈ 10-50 for the three images of the galaxy. The brightest and faintest images differ by a factor of 3.2 in magnification. The implied infrared luminosity is consistent with the galaxy being a LIRG, with a stellar mass of M®* ∼ 2 × 1010 M ® and a star formation rate (SFR) of ∼90 M® yr-1. With lensed fluxes at 24 μm of 0.58 mJy and 0.39 mJy in the two brightest images, this galaxy presents a unique opportunity for detailed study of an obscured starburst with a SFR comparable to that of L* galaxies at z > 2.

AB - We present evidence for a Spitzer-selected luminous infrared galaxy (LIRG) behind the Bullet Cluster (1E0657-56). The galaxy, originally identified as a multiply imaged source using Infrared Array Camera (IRAC) photometry, has a spectral energy distribution consistent with a highly extincted (AV ∼ 3.3), strongly star forming galaxy at z = 2.7. Using our strong gravitational lensing model presented in a previous paper, we find that the magnifications are |μ| ≈ 10-50 for the three images of the galaxy. The brightest and faintest images differ by a factor of 3.2 in magnification. The implied infrared luminosity is consistent with the galaxy being a LIRG, with a stellar mass of M®* ∼ 2 × 1010 M ® and a star formation rate (SFR) of ∼90 M® yr-1. With lensed fluxes at 24 μm of 0.58 mJy and 0.39 mJy in the two brightest images, this galaxy presents a unique opportunity for detailed study of an obscured starburst with a SFR comparable to that of L* galaxies at z > 2.

KW - galaxies: clusters: general

KW - galaxies: evolution

KW - galaxies: starburst

KW - gravitational lensing

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JO - Astrophysical Journal

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IS - 1

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A multiply imaged luminous infrared galaxy behind the bullet cluster (1E0657-56)

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Keywords

ASJC Scopus subject areas

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