Seeing the halo rotation of nearby spiral galaxies using Planck data

Tahir, Noraiz; Paolis, F. De; Qadir, Asghar; Nucita, A. A.

doi:10.1007/s40065-019-0244-x

Cited by 6 publications

(6 citation statements)

References 23 publications

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“…One needs to then use some density distribution on an ad-hoc basis. We had used it to model the distribution of these clouds in the halo of M31 [21] and several other nearby spiral galaxies [22]. Here we will start from scratch, assuming that the clouds are exactly at the CMB temperature, so they are immersed in a heat bath which is the CMB and are completely merged with it.…”

Section: The Virial Modelmentioning

confidence: 99%

Virial clouds explaining the observed rotational asymmetry in the galactic halos

2019

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Rotation of galactic objects has been seen in the CMB that could be ascribed to molecular hydrogen clouds with, or without, dust contamination and contamination from other sources. We model the clouds using the canonical ensemble for pure molecular hydrogen, a mixture of hydrogen helium and or dust, in order to constrain the physical parameters of these clouds. Since, the clouds are cold, we justify the use of the canonical ensemble by explicitly calculating the interaction between the hydrogen molecules and the CMB photons and determining the time required for thermal equilibrium to be reached, and show that there is enough time for the equilibrium to be attained.

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Section: The Virial Modelmentioning

confidence: 99%

Virial clouds explaining the observed rotational asymmetry in the galactic halos

2019

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“…The mutual gravitational interaction between baryonic and non-baryonic matter, considering that the galactic spirals are not homogeneous, must produce a reciprocal drag and the apparent stability of the configuration of the Milky Way makes the equal rotation rates of the two components credible. The problem has been considered when referred to the rotation of gas halos of galaxies [26,46] and the analogy looks reasonable. If so, the mass commonly attributed to the dark halo suggests that the associated GM effect would not be entirely negligible with respect to the usual direct attraction (gravito-electric effect).…”

Section: Experimental Rationalementioning

confidence: 99%

Detecting the gravito-magnetic field of the dark halo of the Milky Way - the LaDaHaD mission concept

Tartaglia

Bassan²,

Casalino

et al. 2021

Exp Astron

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We propose to locate transponders and atomic clocks in at least three of the Lagrange points of the Sun-Earth pair, with the aim of exploiting the time of flight asymmetry between electromagnetic signals travelling in opposite directions along polygonal loops having the Lagrange points at their vertices. The asymmetry is due to the presence of a gravito-magnetic field partly caused by the angular momentum of the Sun, partly originating from the angular momentum of the galactic dark halo in which the Milky Way is embedded. We list also various opportunities which could be associated with the main objective of this Lagrange Dark Halo Detector (LaDaHaD).

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“…The gas and dust clouds had been modeled previously in Refs. [28,29] by using ad-hoc boundary conditions and then the halo rotational velocities of the above-mentioned spiral galaxies estimated. We now use a more reliable model described in detail in Ref.…”

Section: Introductionmentioning

confidence: 99%

On the Galactic Halos Rotation by Planck Data

et al. 2023

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As galactic halos are not directly visible, there are many ambiguities regarding their composition and rotational velocity. Though most of the dark matter is non-baryonic, some fraction is, and it can be used to trace the halo rotation. Asymmetries in the CMB towards M31 had been seen in the Planck data and ascribed to the rotational Doppler shift of the M31 halo. Subsequently, the same methods were used in the direction of five other galaxies belonging to the Local Group, namely M33, M81, M82, NGC 5128, and NGC 4594. It had been proved that there could be stable clouds of gas and dust in thermal equilibrium with the CMB at 2.7 K, which had been called “virial clouds”. In this paper, adopting this scenerio, an attempt is made to constrain the fraction of dust grains and gas molecules in the clouds.

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Seeing the halo rotation of nearby spiral galaxies using Planck data

Cited by 6 publications

References 23 publications

Virial clouds explaining the observed rotational asymmetry in the galactic halos

Virial clouds explaining the observed rotational asymmetry in the galactic halos

Detecting the gravito-magnetic field of the dark halo of the Milky Way - the LaDaHaD mission concept

On the Galactic Halos Rotation by Planck Data

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