Galactic Sun's motion in the cold dark matter, MOdified Newtonian Dynamics and modified gravity scenarios
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Publication:3401342
DOI10.1002/ASNA.200911239zbMATH Open1181.85014arXiv0908.2689OpenAlexW3099749138WikidataQ68576373 ScholiaQ68576373MaRDI QIDQ3401342
Author name not available (Why is that?)
Publication date: 29 January 2010
Published in: (Search for Journal in Brave)
Abstract: We numerically integrate the equations of motion of the Sun in Galactocentric Cartesian rectangular coordinates for -4.5 Gyr <= t <= 0 in Newtonian mechanics with two different models for the Cold Dark Matter (CDM) halo, in MOdified Newtonian Dynamics (MOND) and in MOdified Gravity (MOG) without resorting to CDM. The initial conditions used come from the latest kinematical determination of the 3D Sun's motion in the Milky Way (MW) by assuming for the rotation speed of the Local Standard of Rest (LSR) the recent value Theta_0=268 km s^-1 and the IAU recommended value Theta_0=220 km s^-1; the Sun is assumed located at 8.5 kpc from the Galactic Center (GC). For Theta_0=268 km s^-1 the birth of the Sun, 4.5 Gyr ago, would have occurred at large Galactocentric distances (12-27 kpc depending on the model used), while for Theta_0=220 km s^-1 it would have occurred at about 8.8-9.3 kpc for almost all the models used. The integrated trajectories are far from being circular, especially for Theta_0=268 km s^-1, and differ each other with the CDM models yielding the widest spatial extensions for the Sun's orbital path.
Full work available at URL: https://arxiv.org/abs/0908.2689
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