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gravitational collapse of the galactic dark matter
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نویسنده
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farhadi e ,shariati a
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منبع
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پژوهش فيزيك ايران - 2023 - دوره : 23 - شماره : 3 - صفحه:101 -106
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چکیده
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A spherically symmetric matter collapses under its own gravity. for the milky way, the time scale of collapse for a spherical halo with nfw density is ∼ 26 my which is very small compared to the age of the milky way. the effect of a pressure, obeying a polytrope equation of state is investigated. it is shown that for p ∝ ρ9/8, the time scale would be of the order of 1 gy. it is also argued that such a polytrope, if considered to be in equilibrium, could explain the rotation curve of the milky way.
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کلیدواژه
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milky way ,galaxy ,dark matter ,gravitational collapse ,polytrope
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آدرس
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university of alzahra, faculty of physics, department of fundamental physics, iran, university of alzahra, faculty of physics, department of fundamental physics, iran
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پست الکترونیکی
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shariati@mailaps.org
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gravitational collapse of the galactic dark matter
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Authors
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Abstract
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a spherically symmetric matter collapses under its own gravity. for the milky way, the time scale of collapse for a spherical halo with nfw density is ∼ 26 my which is very small compared to the age of the milky way. the effect of a pressure, obeying a polytrope equation of state is investigated. it is shown that for p ∝ ρ9/8, the time scale would be of the order of 1 gy. it is also argued that such a polytrope, if considered to be in equilibrium, could explain the rotation curve of the milky way.
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Keywords
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milky way ,galaxy ,dark matter ,gravitational collapse ,polytrope
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