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Far-IR detection limits I: Sky confusion due to galactic cirrus

Jeong, Woong-Seob; Lee, Hyung Mok; Pak, Soojong; Nakagawa, Takao; Kwon, Suk Minn; Pearson, Chris P. and White, Glenn (2005). Far-IR detection limits I: Sky confusion due to galactic cirrus. Monthly Notices of the Royal Astronomical Society, 357(2) pp. 535–547.

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Fluctuations in the brightness of the background radiation can lead to confusion with real point sources. This type of confusion with background emission is relevant when making infrared (IR) observations with relatively large beam sizes, since the amount of fluctuation tends to increase with the angular scale. To quantitively assess the effect of the background emission on the detection of point sources for current and future far-IR observations by space-borne missions such as Spitzer, ASTRO-F, Herschel and Space Infrared Telescope for Cosmology and Astrophysics (SPICA), we have extended the Galactic emission map to a higher level of angular resolution than that of the currently available data. Using this high-resolution map, we estimate the sky confusion noise owing to the emission from interstellar dust clouds or cirrus, based on fluctuation analysis and detailed photometry over realistically simulated images. We find that the confusion noise derived by simple fluctuation analysis agrees well with the results from realistic simulations. Although sky confusion noise becomes dominant in long wavelength bands (>100 ?m) with 60�90 cm aperture missions, it is expected to be two orders of magnitude lower for the next generation of space missions (with larger aperture sizes) such as Herschel and SPICA.

Item Type: Journal Item
Copyright Holders: 2005 Royal Astronomical Society
ISSN: 1365-2966
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetKOSEF [R14-2002-058-01000-0]
Keywords: methods:data analysis; techniques:image processing; ISM:structure; galaxies:photometry; infrared:ISM
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 24781
Depositing User: Tracy Bartlett
Date Deposited: 31 Mar 2011 11:24
Last Modified: 11 Dec 2018 01:18
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