Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-14
Adv.Space Res.40:600-604,2007
Astronomy and Astrophysics
Astrophysics
12 pages, 5 figures, uses elsart.cls, Accepted for publication in Advances in Space Research, 36th COSPAR Scientific Assembly
Scientific paper
10.1016/j.asr.2007.05.010
The Cosmic Far-Infrared Background (CFIRB) contains information about the number and distribution of contributing sources and thus gives us an important key to understand the evolution of galaxies. Using a confusion study to set a fundamental limit to the observations, we investigate the potential to explore the CFIRB with AKARI/FIS deep observations. The Far-Infrared Surveyor (FIS) is one of the focal-plane instruments on the AKARI (formerly known as ASTRO-F) satellite, which was launched in early 2006. Based upon source distribution models assuming three different cosmological evolutionary scenarios (no evolution, weak evolution, and strong evolution), an extensive model for diffuse emission from infrared cirrus, and instrumental noise estimates, we present a comprehensive analysis for the determination of the confusion levels for deep far-infrared observations. We use our derived sensitivities to suggest the best observational strategy for the AKARI/FIS mission to detect the CFIRB fluctuations. If the source distribution follows the evolutionary models, observations will be mostly limited by source confusion. We find that we will be able to detect the CFIRB fluctuations and that these will in turn provide information to discriminate between the evolutionary scenarios of galaxies in most low-to-medium cirrus regions.
Hwang Ho Seong
Jeong Woong-Seob
Kawada Mitsunobu
Lee Hyung Mok
Lee Sungho
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