Messier 81's Planck view versus its halo mapping
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2018
- DOI:
- 10.1051/0004-6361/201731725
- arXiv:
- arXiv:1710.04166
- Bibcode:
- 2018A&A...609A.131G
- Keywords:
-
- galaxies: general;
- galaxies: individual: M 81;
- galaxies: halos;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 5 pages, 3 figures, in press in Astronomy and Astrophysics, Main Journal