Armine Amekhyan's publications

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Publication: Article

Messier 81's Planck view vs its halo mapping
V. G. Gurzadyan
F. De Paolis
A. A. Nucita
A. L. Kashin
S. Sargsyan
G. Yegorian
A. Qadir
G. Ingrosso
Ph. Jetzer
D. Vetrugno
Astronomy & Astrophysics

Vol. 609 No. A131 pp. 4 (2018)

URL: https://arxiv.org/abs/1710.04166

DOI: https://doi.org/10.1051/0004-6361/201731725

Description: 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.


On the structure of galactic halos and the microwave temperature maps
International Journal of Modern Physics D

Vol. 28 No. 16, 2040016 pp. 10 (2019)

URL: https://arxiv.org/abs/1903.10757

DOI: https://doi.org/10.1142/S0218271820400167

Description: The study of Planck microwave temperature maps towards several nearby spiral edge-on galaxies had revealed frequency independent temperature asymmetry of Doppler origin in their halos. On an example of M31, as of relatively detailed studied galaxy, the contribution of the dust component in that effect is studied using the models of dust emission and the phenomenological profiles of the dark matter configurations. The results are in accordance with those obtained from the microwave temperature asymmetry data,thus indicating the possible contribution of dust among other radiation mechanisms in revealing the dark halo parameters.


Role of dust in the microwave emission of galactic halos
Սեդա Սարգսյան

Publication: Thesis

Dark Matter and Galactic Halos

Institution: Ա.Ալիխանյանի անվան ազգային լաբորատորիան (ԵրՖԻ)

Publication Year:2020