期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 325, 期 3, 页码 1241-1252出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2001.04566.x
关键词
methods : observational; techniques : photometric; galaxies : evolution; galaxies : photometry; cosmology : observations; infrared : galaxies
Recent ISO data have allowed, for the first time, observationally based estimates for source confusion in mid-infrared surveys. We use the extragalactic source counts from ISOCAM in conjunction with K-band counts to predict the confusion resulting from galaxies in deep midinfrared observations. We specifically concentrate on the near-future Space Infrared Telescope Facility (SIRTF) mission, and calculate expected confusion for the Infrared Array Camera (IRAC) on board SIRTF. A defining scientific goal of the IRAC instrument will be the study of high-redshift galaxies using a deep, confusion-limited wide-field survey at 3-10 mum. A deep survey can reach 3-mu Jy sources with reasonable confidence in the shorter wavelength IRAC bands. Truly confusion-limited images with the 8 mum will be difficult to obtain because of practical time constraints, unless infrared galaxies exhibit very strong evolution beyond the deepest current observations. We find L* galaxies to be detectable to z = 3-3.5 at 8 mum, which is slightly more pessimistic than found in 1999 by Simpson & Eisenhardt.
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