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Planck confirmation of the disk and halo rotation of M 31

Planck data acquired during the first 15.4 months of observations toward both the disk and halo of the M 31 galaxy were analyzed. We confirm the temperature asymmetry that was previously detected by using the seven-year WMAP data in the direction of the rotation of M 31, which indicates that this is...

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Published in:Astronomy and astrophysics (Berlin) 2014-05, Vol.565, p.np-np
Main Authors: De Paolis, F., Gurzadyan, V. G., Nucita, A. A., Ingrosso, G., Kashin, A. L., Khachatryan, H. G., Mirzoyan, S., Poghosian, E., Jetzer, Ph, Qadir, A., Vetrugno, D.
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Language:English
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Summary:Planck data acquired during the first 15.4 months of observations toward both the disk and halo of the M 31 galaxy were analyzed. We confirm the temperature asymmetry that was previously detected by using the seven-year WMAP data in the direction of the rotation of M 31, which indicates that this is a Doppler-induced effect. The asymmetry extends to about 10° (≃130 kpc) from the center of M 31. We also investigated the recent problem raised in Rubin and Loeb (2014, JCAP, 01, 051) about the kinetic Sunyaev-Zel’dovich effect from the diffuse hot gas in the Local Group, which is predicted to generate a hot spot of a few degrees in size in the cosmic microwave background maps in the direction of M 31, where the free electron optical depth is highest. We also considered whether the same effect in the opposite direction with respect to the M 31 galaxy induces a minimum in temperature in the Planck maps of the sky. We find that the Planck data at 100 GHz show an even stronger effect than that expected.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201423849