Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-05-06
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Published in ApJ Letters; column added to table 1 and final column amended, plus minor corrections to match published version
Scientific paper
10.1088/2041-8205/716/1/L45
We present extragalactic number counts and a lower limit estimate for the cosmic infrared background at 15 um from AKARI ultra deep mapping of the gravitational lensing cluster Abell 2218. This data is the deepest taken by any facility at this wavelength, and uniquely samples the normal galaxy population. We have de-blended our sources, to resolve photometric confusion, and de-lensed our photometry to probe beyond AKARI's blank-field sensitivity. We estimate a de-blended 5 sigma sensitivity of 28.7 uJy. The resulting 15 um galaxy number counts are a factor of three fainter than previous results, extending to a depth of ~ 0.01 mJy and providing a stronger lower limit constraint on the cosmic infrared background at 15 um of 1.9 +/- 0.5 nW m^-2 sr^-1.
Egami Eiichi E.
Hopwood Ros
Im Myungshin
Kneib Jean Paul
Ko Jongwan
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