This paper is a follow-up of a previous paper about the M82 galaxy and its halo based on Planck observations. As in the case of M82, so also for the M81 galaxy a substantial North-South and East-West temperature asymmetry is found, extending up to galactocentric distances of about 1.5∘. The temperature asymmetry is almost frequency independent and can be interpreted as a Doppler-induced effect related to the M81 halo rotation and/or triggered by the gravitational interaction of the galaxies within the M81 Group. Along with the analogous study of several nearby edge-on spiral galaxies, the CMB temperature asymmetry method thus is shown to act as a direct tool to map the galactic haloes and/or the intergalactic bridges, invisible in other bands or by other methods.
Cite
@article{arxiv.1710.04166,
title = {Messier 81's Planck view vs its halo mapping},
author = {V. G. Gurzadyan and F. De Paolis and A. A. Nucita and A. L. Kashin and A. Amekhyan and S. Sargsyan and G. Yegorian and A. Qadir and G. Ingrosso and Ph. Jetzer and D. Vetrugno},
journal= {arXiv preprint arXiv:1710.04166},
year = {2018}
}
Comments
5 pages, 3 figures, in press in Astronomy and Astrophysics, Main Journal