Gaseous drag on a gravitational perturber in Modified Newtonian Dynamics and the structure of the wake - AstrophysicsReport as inadecuate




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Abstract: We calculate the structure of a wake generated by, and the dynamical frictionforce on, a gravitational perturber travelling through a gaseous medium ofuniform density and constant background acceleration g ext, in the context ofModified Newtonian Dynamics MOND. The wake is described as a linearsuperposition of two terms. The dominant part displays the same structure asthe wake generated in Newtonian gravity scaled up by a factormu^{-1}g ext-a 0, where a {0} is the constant MOND acceleration and mu theinterpolating function. The structure of the second term depends greatly on theangle between g {ext} and and the velocity of the perturber. We evaluate thedynamical drag force numerically and compare our MOND results with theNewtonian case. We mention the relevance of our calculations to orbit evolutionof globular clusters and satellites in a gaseous proto-galaxy. Potentialdifferences in the X-ray emission of gravitational galactic wakes in MOND andin Newtonian gravity with a dark halo are highlighted.



Author: F. J. Sanchez-Salcedo

Source: https://arxiv.org/



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