Astrophysical Journal, ( ISI ), Volume (872), No (6), Year (2019-2) , Pages (1-12)

Title : ( Evolution of spiral galaxies in modified gravity )

Authors: Mahmood Roshan , Sohrab Rahvar ,

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Abstract

We study the evolution of simulated disk galaxies in the context of a nonlocal theory of gravity. In this theory, the appearance of the dark matter problem in cosmology and astrophysics is a manifestation of the nonlocality of the gravitational interaction. Using high-resolution N-body simulations, we investigate the dynamical evolution of disk galaxies and compare the result with the standard dark matter viewpoint. Specifically, we construct two exponential galaxy models, one in nonlocal gravity -NLG- and the other surrounded by a Plummer dark matter halo. Both systems start from the same baryonic matter distribution, particles velocities, and random velocities and the initial Toomre’s parameter. However, although the initial conditions are the same in both models, their long- term dynamics reveal some notable differences. For example, it turns out that the bar instability happens with a higher rate in the NLG model compared with the standard case. On the other hand, at the end of the simulation, we find that bars are weaker and faster in NLG compared with the standard case.

Keywords

evolution – galaxies: kinematics and dynamics – galaxies: spiral – instabilities
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@article{paperid:1073025,
author = {Roshan, Mahmood and Sohrab Rahvar},
title = {Evolution of spiral galaxies in modified gravity},
journal = {Astrophysical Journal},
year = {2019},
volume = {872},
number = {6},
month = {February},
issn = {0004-637X},
pages = {1--12},
numpages = {11},
keywords = {evolution – galaxies: kinematics and dynamics – galaxies: spiral – instabilities},
}

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%0 Journal Article
%T Evolution of spiral galaxies in modified gravity
%A Roshan, Mahmood
%A Sohrab Rahvar
%J Astrophysical Journal
%@ 0004-637X
%D 2019

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