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Astron. Astrophys. 355, 17-22 (2000)

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Detection of the extra-Galactic background fluctuations at 170 µ*

G. Lagache and J.L. Puget

Institut d'Astrophysique Spatiale, Bât. 121, Université Paris XI, 91405 Orsay Cedex, France

Received 18 March 1999 / Accepted 1 October 1999


We have used the Marano1 field observations with ISOPHOT at 170µm to search for the Cosmic Far-InfraRed Backgroundfluctuations. This field is part of the FIRBACK project (Puget et al.1999). For the first time, fluctuations due to unresolvedextra-Galactic sources are isolated. The emission of such sourcesclearly dominates, at arcminute scales, the background fluctuations inthe lowest Galactic emission regions.

The study presented here is based on a power spectrum analysiswhich allow to statistically separate each of the backgroundcomponents. With this analysis, we clearly show that we detect theCFIRB fluctuations.

Key words: cosmology: diffuseradiation – infrared: ISM:continuum – infrared: general

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA

Send offprint requests to: G. Lagache (lagache@ias.fr)

© European Southern Observatory (ESO) 2000

Online publication: March 17, 2000