Hopwood, R.; Serjeant, S.; Negrello, M.; Pearson, C.; Egami, E.; Im, M.; Kneib, J.-P.; Ko, J.; Lee, H. M.; Lee, M. G.; Matsuhara, H.; Nakagawa, T.; Smail, I. and Takagi, T.
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We present extragalactic number counts and a lower limit estimate for the cosmic infrared background (CIRB) at 15 μm from AKARI ultra deep mapping of the gravitational lensing cluster Abell 2218. These data are the deepest taken by any facility at this wavelength and uniquely sample 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 5σ sensitivity of 28.7 μJy. The resulting 15 μm galaxy number counts are a factor of 3 fainter than previous results, extending to a depth of ~ 0.01 mJy and providing a stronger lower limit constraint on the CIRB at 15 μm of 1.9 ± 0.5 nW m–2 sr–1.
|Item Type:||Journal Article|
|Copyright Holders:||2010 The American Astronomical Society|
|Keywords:||galaxies: clusters: individual (Abell 2218); galaxies: evolution; infrared: galaxies|
|Academic Unit/Department:||Science > Physical Sciences|
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Astrid Peterkin|
|Date Deposited:||14 Dec 2010 12:21|
|Last Modified:||20 Nov 2012 21:34|
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