The far-infrared/submillimeter properties of galaxies located behind the Bullet cluster

Abstract

The Herschel Lensing Survey (HLS) takes advantage of gravitational lensing by massive galaxy clusters to sample a population of high-redshift galaxies which are too faint to be detected above the confusion limit of current far-infrared/submillimeter telescopes. Measurements from 100-500 micron bracket the peaks of the far-infrared spectral energy distributions of these galaxies, characterizing their infrared luminosities and star formation rates. We introduce initial results from our science demonstration phase observations, directed toward the Bullet cluster (1E0657-56). By combining our observations with LABOCA 870 micron and AzTEC 1.1 mm data we fully constrain the spectral energy distributions of 19 MIPS 24 micron selected galaxies which are located behind the cluster. We find that their colors are best fit using templates based on local galaxies with systematically lower infrared luminosities.This suggests that our sources are not like local ultra-luminous infrared galaxies in which vigorous star formation is contained in a compact highly dust-obscured region. Instead, they appear to be scaled up versions of lower luminosity local galaxies with star formation occurring on larger physical scales.

8 pages with 4 figures. Accepted for publication in Astronomy and Astrophysics (Herschel special issue)

References in corpus (10)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
• The Herschel Lensing Survey (HLS): overview
• First detection of the Sunyaev Zel'dovich effect increment at lambda < 650 um
• Improving the identification of high-z Herschel sources with position priors and optical/NIR and FIR/mm photometric redshifts
• Deep Herschel view of obscured star formation in the Bullet cluster
• A Multiply Imaged Luminous Infrared Galaxy Behind the Bullet Cluster
• A Bright Submillimeter Source in the Bullet Cluster (1E0657--56) Field Detected with BLAST

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