On the orbital velocity of isolated galaxy pairs: a test of gravity in the low acceleration regime

Scarpa, Riccardo; Falomo, Renato; Treves, Aldo
Bibliographical reference

Monthly Notices of the Royal Astronomical Society

Advertised on:
2
2022
Number of authors
3
IAC number of authors
1
Citations
4
Refereed citations
4
Description
The dynamics of isolated galaxy pairs represents an important tool to investigate the behaviour of gravity in the low acceleration regime. Statistical analysis of a large sample of galaxy pairs led to the noticeable discovery of a region of preferred 3-dimensional velocities centered at ~150 and ~100 km s-1 wide, a feature hard to justify in the context of numerical simulations of cosmological structure formation. It is shown here that such a feature is expected within the framework of the modified Newtonian dynamics, which, however, predicts it to be centered at ~ 170 Km s-1.
Related projects
Project Image
Relativistic and Theoretical Astrophysics
Introduction Gravitational lenses are a powerful tool for Astrophysics and Cosmology. The goals of this project are: i) to obtain a robust determination of the Hubble constant from the time delay measured between the images of a lensed quasar; ii) to study the individual and statistical properties of dark matter condensations in lens galaxies from
Evencio
Mediavilla Gradolph