Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-20
Astrophysical Journal 540, 14-19 (2000)
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures; uses emulateapj.sty; submitted to ApJ
Scientific paper
10.1086/309301
The low redshift structures of the Universe act as lenses in a similar way on the Cosmic Microwave Background light and on the distant galaxies (say at redshift about unity). As a consequence, the CMB temperature distortions are expected to be statistically correlated with the galaxy shear, exhibiting a non-uniform distribution of the relative angle between the CMB and the galactic ellipticities. Investigating this effect we find that its amplitude is as high as a 10% excess of alignement between CMB and the galactic ellipticities relative to the uniform distribution. The relatively high signal-to-noise ratio we found should makes possible a detection with the planned CMB data sets, provided that a galaxy survey follow up can be done on a sufficiently large area. It would provide a complementary bias-independent constraint on the cosmological parameters.
Benabed Karim
Bernardeau Francis
Waerbeke Ludo van
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