Volume 593, September 2016
|Number of page(s)||7|
|Published online||21 September 2016|
Triangulum galaxy viewed by Planck
1 Dipartimento di Matematica e Fisica “Ennio De Giorgi”, Università del Salento, via per Arnesano, 73100 Lecce, Italy
2 INFN, Sezione di Lecce, via per Arnesano, 73100 Lecce, Italy
3 Center for Cosmology and Astrophysics, Alikhanian National Laboratory and Yerevan State University, Yerevan, Armenia
4 SIA, Sapienza University of Rome, 00185 Rome, Italy
5 LAB, CNRS UMR 5804, Université de Bordeaux, 33270 Floirac, France
6 School of Natural Sciences, National University of Sciences and Technology, 44000 Islamabad, Pakistan
7 Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
8 Department of Physics, University of Trento; and TIFPA/INFN, 38123 Povo, Trento, Italy
Received: 23 April 2016
Accepted: 11 July 2016
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.
Key words: galaxies: general / galaxies: individual: M 33 / galaxies: halos
© ESO, 2016
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