Modified Gravity (MOG) and its test on galaxy clusters

Theodorus M. Nieuwenhuizen (1, 2) , Andrea Morandi (3) , Marceau Limousin (4)

1 UNIVERSITY OF AMSTERDAM - Institute of Theoretical Physics
2 UFRGS - Instituto de Informática da UFRGS
3 UAH - University of Alabama in Huntsville
4 LAM - Laboratoire d'Astrophysique de Marseille

The MOdified Gravity (MOG) theory of J. Moffat assumes a massive vector particle which causes a repulsive contribution to the tensor gravitation. For the galaxy cluster A1689 new data for the X-ray gas and the strong lensing properties are presented. Fits to MOG are possible by adjusting the galaxy density profile. However, this appears to work as an effective dark matter component, posing a serious problem for MOG. New gas and strong lensing data for the cluster A1835 support these conclusions and point at a tendency of the gas-alone to overestimate the lensing effects in MOG theory.

Mots clés: gravitationallensing:strong; gravitation; galaxies:clusters:individual:...

Domaines: Planète et Univers [physics]; Astrophysique [astro-ph]; Astrophysique galactique [astro-ph.GA]

Theodorus M. Nieuwenhuizen, Andrea Morandi, Marceau Limousin. Modified Gravity (MOG) and its test on galaxy clusters. Monthly Notices of the Royal Astronomical Society, 2018, ⟨10.1093/mnras/sty380⟩. ⟨hal-01740477⟩