Analytical analysis of the origin of core-cusp matter density distributions in galaxies

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Analytical analysis of the origin of core-cusp matter density distributions in galaxies. / Капустин, Александр Дмитриевич ; Пастон, Сергей Александрович.

в: Journal of Cosmology and Astroparticle Physics, Том 2022, № 11, 025, 01.11.2022.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

BibTeX

@article{d67c4882ed2d48d08dbc0bab95ddd368,

title = "Analytical analysis of the origin of core-cusp matter density distributions in galaxies",

abstract = "We propose an analytical method to describe a matter density profile near a galaxy center. The description is based on the study of the distribution function of particles over possible trajectories. We establish a relation between the central slope of density profile and the near-origin behavior of the angular momentum distribution function. We consider both a spherically symmetric (on average) matter distribution as well as deviations from it. If the density profile forms in a background of spherical gravitation potential then a core-type distribution arises. A regular matter may behave in such way if the background potential was formed by the dark matter. In the presence of deviation from spherical symmetry the formation of cusp-type distribution is possible. Moreover, a reduction of spherical symmetry to the axial one leads to a less steep cusp profile. The complete symmetry breaking (which corresponds, in particular, to the common setup of numerical simulations), leads to a steeper cusp profile.",

keywords = "dark matter simulations, dark matter theory, galaxy formation",

author = "Капустин, {Александр Дмитриевич} and Пастон, {Сергей Александрович}",

year = "2022",

month = nov,

day = "1",

doi = "10.1088/1475-7516/2022/11/025",

language = "English",

volume = "2022",

journal = "Journal of Cosmology and Astroparticle Physics",

issn = "1475-7516",

publisher = "IOP Publishing Ltd.",

number = "11",

}

RIS

TY - JOUR

T1 - Analytical analysis of the origin of core-cusp matter density distributions in galaxies

AU - Капустин, Александр Дмитриевич

AU - Пастон, Сергей Александрович

PY - 2022/11/1

Y1 - 2022/11/1

N2 - We propose an analytical method to describe a matter density profile near a galaxy center. The description is based on the study of the distribution function of particles over possible trajectories. We establish a relation between the central slope of density profile and the near-origin behavior of the angular momentum distribution function. We consider both a spherically symmetric (on average) matter distribution as well as deviations from it. If the density profile forms in a background of spherical gravitation potential then a core-type distribution arises. A regular matter may behave in such way if the background potential was formed by the dark matter. In the presence of deviation from spherical symmetry the formation of cusp-type distribution is possible. Moreover, a reduction of spherical symmetry to the axial one leads to a less steep cusp profile. The complete symmetry breaking (which corresponds, in particular, to the common setup of numerical simulations), leads to a steeper cusp profile.

AB - We propose an analytical method to describe a matter density profile near a galaxy center. The description is based on the study of the distribution function of particles over possible trajectories. We establish a relation between the central slope of density profile and the near-origin behavior of the angular momentum distribution function. We consider both a spherically symmetric (on average) matter distribution as well as deviations from it. If the density profile forms in a background of spherical gravitation potential then a core-type distribution arises. A regular matter may behave in such way if the background potential was formed by the dark matter. In the presence of deviation from spherical symmetry the formation of cusp-type distribution is possible. Moreover, a reduction of spherical symmetry to the axial one leads to a less steep cusp profile. The complete symmetry breaking (which corresponds, in particular, to the common setup of numerical simulations), leads to a steeper cusp profile.

KW - dark matter simulations

KW - dark matter theory

KW - galaxy formation

UR - http://www.scopus.com/inward/record.url?scp=85142440050&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/112d8499-65fc-3c51-982d-44ed8969ee59/

U2 - 10.1088/1475-7516/2022/11/025

DO - 10.1088/1475-7516/2022/11/025

M3 - Article

VL - 2022

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 11

M1 - 025

ER -

ID: 100709032