Abstract
AMI observations towards CIZA J2242+5301, in comparison with observations of weak gravitational lensing and X-ray emission from the literature, are used to investigate the behaviour
of non-baryonic dark matter (NBDM) and gas during the merger. Analysis of the Sunyaev- Zel’dovich (SZ) signal indicates the presence of high pressure gas elongated perpendicularly
to the X-ray and weak-lensing morphologies which, given the merger-axis constraints in the literature, implies that high pressure gas is pushed out into a linear structure during core
passing. Simulations in the literature closely matching the inferred merger scenario show the formation of gas density and temperature structures perpendicular to the merger axis. These
SZ observations are challenging for modified gravity theories in which NBDM is not the dominant contributor to galaxy-cluster gravity.
of non-baryonic dark matter (NBDM) and gas during the merger. Analysis of the Sunyaev- Zel’dovich (SZ) signal indicates the presence of high pressure gas elongated perpendicularly
to the X-ray and weak-lensing morphologies which, given the merger-axis constraints in the literature, implies that high pressure gas is pushed out into a linear structure during core
passing. Simulations in the literature closely matching the inferred merger scenario show the formation of gas density and temperature structures perpendicular to the merger axis. These
SZ observations are challenging for modified gravity theories in which NBDM is not the dominant contributor to galaxy-cluster gravity.
| Original language | English |
|---|---|
| Article number | stx1429 |
| Journal | Monthly Notices of the Royal Astronomical Society |
| Early online date | 9 Jun 2017 |
| DOIs | |
| Publication status | Published - 2017 |
Keywords
- galaxies: clusters: individual
- methods: observational
- techniques: interferometric
- Large-scale structure of the Universe
- dark matter