Messier 81’s Planck view versus its halo mapping

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.

doi:10.1051/0004-6361/201731725

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.

Titolo:	Messier 81’s Planck view versus its halo mapping
Autori:	Gurzadyan, V. G. DE PAOLIS, Francesco NUCITA, Achille Kashin, A. L. Amekhyan, A. Sargsyan, S. Yegorian, G. Qadir, A. INGROSSO, Gabriele Jetzer, Ph. Vetrugno, D. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2018
Rivista:	ASTRONOMY & ASTROPHYSICS
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.
Handle:	http://hdl.handle.net/11587/427122
Appare nelle tipologie:	Articolo pubblicato su Rivista

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