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Date and Time of the Query: 2018-12-15 T02:03:06 PST
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For refcode 2001A&A...372..364D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...372..364D FIRBACK: III. Catalog, source counts, and cosmological implications of the 170 micron ISO deep survey DOLE H., GISPERT R., LAGACHE G., PUGET J.-L., BOUCHET F.R., CESARSKY C., CILIEGI P., CLEMENTS D.L., DENNEFELD M., DESERT F.-X., ELBAZ D., FRANCESCHINI A., GUIDERDONI B., HARWIT M., LEMKE D., MOORWOOD A.F.M., OLIVER S., REACH W.T., ROWAN-ROBINSON M., STICKEL M. Received 23 January 2001/Accepted 5 March 2001 Abstract. The FIRBACK (Far Infrared BACKground) survey is one of the deepest imaging surveys carried out at 1705m with ISOPHOT onboard ISO, and is aimed at the study of the structure of the Cosmic Far Infrared Background. This paper provides the analysis of resolved sources. After a validated process of data reduction and calibration, we perform intensive simulations to optimize the source extraction, measure the confusion noise ({sigma}_c_ = 45 mJy), and give the photometric and astrometric accuracies. 196 galaxies with flux S > 3{sigma}_c_ are detected in the area of 3.89 square degrees. Counts of sources with flux S >4{sigma}_c_ present a steep slope of 3.3+/-0.6 on a differential "logN-logS" plot between 180 and 500mJy. As a consequence, the confusion level is high and will impact dramatically on future IR deep surveys. This strong evolution, compared with a slope of 2.5 from Euclidian geometry, is in line with models implying a strongly evolving Luminous Infrared Galaxy population. The resolved sources account for less than 10% of the Cosmic Infrared Background at 1705m, which is expected to be resolved into sources in the 1 to 10 mJy range. Key words: cosmology: miscellaneous - galaxies: infrared - galaxies: evolution - galaxies: statistics
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