Messier 81’s Planck view versus its halo mapping

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 temperat...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2018-01, Vol.609, p.A131
Main Authors: Gurzadyan, V. G., De Paolis, F., Nucita, A. A., Kashin, A. L., Amekhyan, A., Sargsyan, S., Yegorian, G., Qadir, A., Ingrosso, G., Jetzer, Ph, Vetrugno, D.
Format: Article
Language:English
Subjects:
Asymmetry
Big Bang theory
Cosmic microwave background
Cosmic microwave background temperature
Doppler effect
Galactic halos
Galactic rotation
galaxies: general
galaxies: halos
galaxies: individual: M 81
Spiral galaxies
Stars & galaxies
Temperature
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Summary: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.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201731725