Volume 609, January 2018
|Number of page(s)||4|
|Published online||05 February 2018|
Messier 81’s Planck view versus its halo mapping
1 Center for Cosmology and Astrophysics, Alikhanian National Laboratory and Yerevan State University, 0036 Yerevan, Armenia
2 SIA, Sapienza University of Rome, 00185 Rome, Italy
3 Dipartimento di Matematica e Fisica “E. De Giorgi”, Università del Salento, via per Arnesano, 73100 Lecce, Italy
4 INFN, Sezione di Lecce, via per Arnesano, 73100 Lecce, Italy
5 Department of Physics, School of Natural Sciences, National University of Sciences and Technology, 44000 Islamabad, Pakistan
6 Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
7 Department of Physics, University of Trento, 38123 Povo, Trento, Italy and TIFPA/INFN, 38123 Povo, Italy
Received: 6 August 2017
Accepted: 3 October 2017
This paper is a follow-up of a previous paper about the M 82 galaxy and its halo based on Planck observations. As in the case of M 82, a substantial north-south and east-west temperature asymmetry is also found for the M 81 galaxy, 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 M 81 halo rotation and/or triggered by the gravitational interaction of the galaxies within the M 81 Group. Along with the analogous study of several nearby edge-on spiral galaxies, the cosmic microwave background 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.
Key words: galaxies: general / galaxies: individual: M 81 / galaxies: halos
© ESO, 2018
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