# Triangulum galaxy viewed byPlanck

De Paolis, F; Gurzadyan, V G; Nucita, A A; Chemin, L; Qadir, A; Kashin, A L; Khachatryan, H G; Sargsyan, S; Yegorian, G; Ingrosso, G; Jetzer, Ph; Vetrugno, D (2016). Triangulum galaxy viewed byPlanck. Astronomy and Astrophysics, 593:A57.

## 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.

## 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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11 citations in Web of Science®
12 citations in Scopus®