Triangulum galaxy viewed by Planck

F., de Paolis , V. G., Gurzadyan , A. A., Nucita , L. Chemin (1) , A., Qadir , A. L., Kashin , H. G., Khachatryan , S., Sargsyan (2) , G., Yegorian , G., Ingrosso (3) , Ph., Jetzer (4) , D., Vetrugno

1 M2A 2016
2 IRCCyN - Institut de Recherche en Communications et en Cybernétique de Nantes
3 OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale
4 Physik-Institut [Zürich]

We used Planck data to study the M33 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 degree, and it is found to extend up to about 3 degrees 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 M33 galaxy and of its extended baryonic halo.

Mots clés: Astrophysics - Astrophysics of Galaxies

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

F., de Paolis, V. G., Gurzadyan, A. A., Nucita, L. Chemin, A., Qadir, et al.. Triangulum galaxy viewed by Planck. Astronomy and Astrophysics - A&A, 2016, 593, pp.A57. ⟨10.1051/0004-6361/201628780⟩. ⟨hal-01358310⟩