We present the 250 , 350 , and 500 µm detection of bright submillimeter emission in the direction of the Bullet Cluster measured by the Balloon-borne Large-Aperture Submillimeter Telescope ( BLAST ) .
The 500 µm centroid is coincident with an AzTEC 1.1 mm point-source detection at a position close to the peak lensing magnification produced by the cluster .
However , the 250 µm and 350 µm centroids are elongated and shifted toward the south with a differential shift between bands that can not be explained by pointing uncertainties .
We therefore conclude that the BLAST detection is likely contaminated by emission from foreground galaxies associated with the Bullet Cluster .
The submillimeter redshift estimate based on 250–1100 µm photometry at the position of the AzTEC source is z _ { phot } = 2.9 ^ { +0.6 } _ { -0.3 } , consistent with the infrared color redshift estimation of the most likely IRAC counterpart .
These flux densities indicate an apparent far-infrared luminosity of L _ { FIR } = 2 \times 10 ^ { 13 } L _ { \odot } .
When the amplification due to the gravitational lensing of the cluster is removed , the intrinsic far-infrared luminosity of the source is found to be L _ { FIR } \leq 10 ^ { 12 } L _ { \odot } , consistent with typical luminous infrared galaxies .