MG13 - Talk detail |
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Participant |
De Paolis, Francesco | |||||||
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Institution |
Dipartimento di Matematica e Fisica "Ennio De Giorgi" - Via Arnesano - Lecce - - Italy | |||||||
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Session |
CB2 |
Accepted |
Yes |
Order |
99 |
Time |
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Talk |
Poster abstract |
Title |
Possible evidence of the M31 halo rotation in WMAP data | |||||
| Co-authors | V. G. Gurzadyan, G. Ingrosso, Ph. Jetzer, A. Nucita, A. Qadir, D. Vetrugno, A. L. Kashin, H. G. Khachatryan, S. Mirzoyan | |||||||
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Abstract |
The 7-year WMAP data are used to trace the disk and the halo of the M31 galaxy. An asymmetry in the mean microwave temperature in the M31 disk along the direction of the M31 rotation is observed with a temperature contrast up to 130 μK/pixel. We also find a temperature asymmetry in the M31 halo, up to a galactocentric distance of about 120 kpc with a peak temperature contrast of about 40 μK/pixel. By comparing the obtained temperature contrast profiles with the real ones towards the M31 galaxy, we find that the temperature asymmetry in the M31 disk is fairly robust, while the effect in the halo is weaker. Although the confidence level of the signal is not high, if estimated purely statistically, the geometrical structure of the temperature asymmetry points towards a definite effect, which could be proven or disproven by Planck data. |
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