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Title:
A Multiply Imaged Luminous Infrared Galaxy Behind the Bullet Cluster (1E0657-56)
Authors:
Gonzalez, Anthony H.; Clowe, Douglas; Bradač, Maruša; Zaritsky, Dennis; Jones, Christine; Markevitch, Maxim
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA ), AB(Department of Physics & Astronomy, Ohio University, Clippinger Labs 251B, Athens, OH 45701, USA ), AC(Department of Physics, University of California at Santa Barbara, Santa Barbara, CA 93106, USA ), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA ), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA)
Publication:
The Astrophysical Journal, Volume 691, Issue 1, pp. 525-530 (2009). (ApJ Homepage)
Publication Date:
01/2009
Origin:
IOP
ApJ Keywords:
galaxies: clusters: general, galaxies: evolution, galaxies: starburst, gravitational lensing
DOI:
10.1088/0004-637X/691/1/525
Bibliographic Code:
2009ApJ...691..525G

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 * ~ 2 × 1010 M sun and a star formation rate (SFR) of ~90 M sun 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.

This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile, the Hubble Space Telescope, and the Spitzer Space Telescope.

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