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The velocity distribution of SDSS satellites in MOND · Around

2007

The velocity distribution of SDSS satellites in MOND

Angus, Garry, Famaey, Benoit, Tiret, Olivier et al.

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The recent SDSS measured velocity distribution of satellite galaxies has been modelled in the context of MOND.

We show that even when the extra constraint of adhering to the projected satellite number density profile is added, the two line of sight (los) velocity dispersion profiles presented in Klypin & Prada (2007) can be matched simply with a radially varying anisotropy.
Interestingly, the anisotropies required to fit the los velocity dispersions are remarkably similar to the anisotropies generated by dissipationless collapse simulations in MOND.
The mass-to-light ratios of the two host galaxies used are sensible and positivity of the distribution function is satisfied.

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Milgrom M., 2002, ApJ, 577, L75
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Bournaud F., et al., 2007, Science, 311, 1166
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Gentile G., Famaey B., Combes F., Kroupa P., Zhao H.S., Tiret O., 2007, A&A, 472, L25
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Klypin A., Prada F., 2007, (arXiv:0706.3554v1)
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Milgrom M., 2007, ApJ in press (arXiv:0706.0875)
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Sanders R.H., 2007, MNRAS, 380, 331
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