Abstract
We used Planck data to study the M 33 galaxy and find a substantial temperature asymmetry with respect to its minor axis projected onto the sky plane. This temperature asymmetry correlates well with the HI velocity field at 21 cm, at least within a galactocentric distance of 0.5°, and it is found to extend up to about 3° from the galaxy center. We conclude that the revealed effect, that is, the temperature asymmetry and its extension, implies that we detected the differential rotation of the M 33 galaxy and of its extended baryonic halo.
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De Paolis, F., Gurzadyan, V. G., Nucita, A. A., Chemin, L., Qadir, A., Kashin, A. L., … Vetrugno, D. (2016). Triangulum galaxy viewed by Planck. Astronomy and Astrophysics, 593. https://doi.org/10.1051/0004-6361/201628780
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