Evolution of virial clouds-I: from surface of last scattering up to the formation of population-III stars

Tahir, Noraiz; Qadir, Asghar; Sakhi, Muhammad; Paolis, F. De

doi:10.1140/epjc/s10052-021-09620-9

Cited by 3 publications

(4 citation statements)

References 28 publications

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“…It was seen in Ref. [54] that at z = 50 virial clouds which are made of primordial gas have a mass of about 10 5 M which does not violate the results of Ref. [55].…”

Section: Resultsmentioning

confidence: 76%

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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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“…It was seen in Ref. [54] that at z = 50 virial clouds which are made of primordial gas have a mass of about 10 5 M which does not violate the results of Ref. [55].…”

Section: Resultsmentioning

confidence: 76%

“…Their formation would have been after the recombination time (that is at z < 1000), and they must have been in equilibrium with the CMB since then. The first step of the evolution of these clouds from the surface of the last scattering (LSS) up to the formation of population-III stars has been studied in detail [54]. In Ref.…”

Section: Resultsmentioning

confidence: 99%

On the Galactic Halos Rotation by Planck Data

et al. 2023

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“…It was seen in Ref. (Tahir et al , 2021) that at z = 50 virial clouds which are made of primordial gas have a mass of about 10 5 M ⊙ which does not violate the results of Ref. Bromm et al (1999).…”

Section: Dementioning

confidence: 74%

Section: Dementioning

confidence: 99%

On the Galactic Halos Rotation by Planck Data

Tahir,

De Paolis,

Qadir

et al. 2023

Preprint

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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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The rotational kinetic Sunyaev–Zeldovich contribution to the temperature asymmetry toward the M 31 halo

Tahir

Paolis

Qadir

et al. 2022

A&A

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Temperature asymmetry in the cosmic microwave background (CMB) data by the Planck satellite has been discovered and analyzed toward several nearby edge-on spiral galaxies. It provides a way to probe galactic halo rotation, and to constrain the baryon fraction in the galactic halos. The frequency independence of the observed data provides a strong indication of the Doppler shift nature of the effect, due to the galactic halo rotation. It was proposed that this effect may arise from the emission of cold gas clouds populating the galactic halos. However, in order to confirm this view, other effects that might give rise to a temperature asymmetry in the CMB data, have to be considered and studied in detail. The main aim of the present paper is to estimate the contribution in the CMB temperature asymmetry data due to the free-free emission by hot gas (particularly electrons) through the rotational kinetic Sunyaev-Zeldovich (rkSZ) effect. We concentrate, in particular, on the M31 galactic halo and compare the estimated values of the rkSZ induced temperature asymmetry with those obtained by using the SMICA pipeline of the Planck data release, already employed to project out the SZ sources and for lensing studies. As an additional consistency check, we also verified that the hot gas diffuse emission in the X-ray band does not exceed that detected in the soft X-ray band by ROSAT observations. We note that our results clearly show that the rkSZ effect gives only a minor contribution to the observed M31 halo temperature asymmetry by Planck data.

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Evolution of virial clouds-I: from surface of last scattering up to the formation of population-III stars

Cited by 3 publications

References 28 publications

On the Galactic Halos Rotation by Planck Data

On the Galactic Halos Rotation by Planck Data

On the Galactic Halos Rotation by Planck Data

The rotational kinetic Sunyaev–Zeldovich contribution to the temperature asymmetry toward the M 31 halo

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