Les fluctuations du fond diffus extragalactique et ses avant-plans, de l'infrarouge au domaine millimétrique

Abstract : This thesis presents a work on the cosmic diffuse background fluctuations in the infrared and micro-wave wavelengths. (1) A cirrus color study shows the increase of the color B(60 microns)/B(100 microns) from 0.21 to 0.28 when cirrus brightness is lower then 3 MJy/sr. This is due to an increase of the very small grains abundance at high latitude, where supernovae winds cause erosion and fragmentation of grains. (2) Separation between cirrus and cosmic infrared background (CIB) fluctuations with colors B(60)/B(100), B(60)/B(170), B(100)/B(170) is not efficient because of the closeness of the two spectra. This analyse should be done at longer wavelengths with the futur missions Planck and Herschel. (3) Power spectrum of the CIB fluctuations shows no correlation. We deduce an upper limit of 0.6 on the infrared bias. This reveal that galaxies forming the CIB fluctuations are at low redshift. We must explore bigger maps to detect correlation. (4) A statistical way to separate cosmic micro-wave backgound (CMB) fluctuations from kinetic Sunyaev-Zel'dovich (SZ) effect could be a law known in advance between the kinetic SZ effect and the covariance product between the thermal SZ effect and the mixture map (CMB + kinetic SZ).
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Submitted on : Wednesday, July 13, 2005 - 3:49:37 PM
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Maud Sorel. Les fluctuations du fond diffus extragalactique et ses avant-plans, de l'infrarouge au domaine millimétrique. Astrophysique [astro-ph]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00009750⟩

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