Publication details
Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116+111
| Authors | |
|---|---|
| Year of publication | 2019 |
| Type | Article in Periodical |
| Magazine / Source | Monthly Notices of the Royal Astronomical Society |
| MU Faculty or unit | |
| Citation | |
| Web | |
| Doi | http://dx.doi.org/10.1093/mnras/stz1228 |
| Keywords | magnetic fields; galaxies: active; galaxies: clusters: individual: MRC 0116+111; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters |
| Description | MRC 0116 111 is a nearby (z = 0.132) poor galaxy group, which was previously known for exhibiting a bright diffuse radio emission with no central point-like source, presumably related to a past activity of the active galactic nucleus (AGN) in its central cif.) galaxy. Here, we present an X-ray observation (similar to 30 ks of cleaned XM M Newtonll TIC exposure) of this system, allowing us for the first time a detailed comparison between the thermal and non-thermal components of its intragroup medium (1GrM). Remarkably, we find that the radio-lo-X-ray luminosity ratio is among the highest ever observed for a diffuse extragalactic source so far, while the extent of the observed radio emission is about three limes larger than its observed soft: X-ray emission. Although powerful AGN activity may have disturbed the dynamics of the thermal 1GrM in the form of turbulence, possibly re-energizing part of the relativistic electron population, the gas properties lie within the 1.0 scaling relation established previously for other groups. The upper limit we rind for the non-thermal inverse-Compton X-ray emission translates into a surprisingly high lower limit for the volume-averaged magnetic field of the group (>4.3 G). Finally, we discuss some interesting properties of a distant (z similar or equal to 0.525) galaxy cluster serendipitously discovered in our EPIC field of view. |