TY - JOUR
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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U2 - 10.1088/0004-637X/691/1/525
DO - 10.1088/0004-637X/691/1/525
M3 - Article
AN - SCOPUS:70549085409
SN - 0004-637X
VL - 691
SP - 525
EP - 530
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
ER -