Triangulum galaxy viewed by Planck
Chemin, L.; Nucita, A. A.; De Paolis, F.; Ingrosso, G.; Vetrugno, D.; Gurzadyan, V. G.; Qadir, A.; Kashin, A. L.; Khachatryan, H. G.; Sargsyan, S.; Yegorian, G.; Jetzer, Ph.
Italy, Armenia, France, Pakistan, Switzerland
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.