Far-infrared detection limits - I. Sky confusion due to Galactic cirrus

Jeong, Woong Seob and Lee, Hyung Mok and Pak, Soojong and Nakagawa, Takao and Kwon, Suk Minn and Pearson, Chris P. and White, Glenn J. (2005) Far-infrared detection limits - I. Sky confusion due to Galactic cirrus. Monthly Notices of the Royal Astronomical Society, 357 (2). pp. 535-547. ISSN 0035-8711. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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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 mum) 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: Article
Additional information: 55 BLACKWELL PUBLISHING LTD 895IG
Uncontrolled keywords: methods : data analysis; techniques : image processing; ISM : structure; galaxies : photometry; infrared : ISM HUBBLE DEEP FIELD; EXTRAGALACTIC SOURCE COUNTS; F/FIS OBSERVING SIMULATION; AREA ISO SURVEY; POWER SPECTRUM; ASTRO-F/FIS; MU-M; GALAXY FORMATION; NUMBER COUNTS; DUST EMISSION
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 09 Sep 2008 15:26
Last Modified: 10 Jul 2014 15:01
Resource URI: https://kar.kent.ac.uk/id/eprint/10913 (The current URI for this page, for reference purposes)
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