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Confusion limit due to galaxies: using SIRTF's Infrared Array Camera | P.Vaisanen
; E.V.Tollestrup
; G.G.Fazio
; | Date: |
6 Jun 2001 | Journal: | Mon.Not.Roy.Astron.Soc. 325 (2001) 1241 | Subject: | astro-ph | Affiliation: | 1,2), E.V.Tollestrup , G.G.Fazio ( Observatory, Helsinki; CfA | Abstract: | Recent ISO-data has 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 due to galaxies in deep mid-IR observations. We specifically concentrate on the near-future Space Infrared Telescope Facility (SIRTF) mission, and calculate expected confusion for the Infrared Array Camera (IRAC) onboard 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 microns. A deep survey can reach 3 $mu$Jy sources with reasonable confidence in the shorter wavelength IRAC bands. Truly confusion limited images at 8 microns will be difficult to obtain due to practical time constraints, unless infrared galaxies exhibit very strong evolution beyond the deepest current observations. We find L^star galaxies to be detectable to z=3-3.5 at 8 microns, which is slightly more pessimistic than found by Simpson & Eisenhardt (1999). | Source: | arXiv, astro-ph/0106092 | Services: | Forum | Review | PDF | Favorites |
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