Informace o publikaci

Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116+111



Rok publikování 2019
Druh Článek v odborném periodiku
Časopis / Zdroj Monthly Notices of the Royal Astronomical Society
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Klíčová slova magnetic fields; galaxies: active; galaxies: clusters: individual: MRC 0116+111; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
Popis 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.

Používáte starou verzi internetového prohlížeče. Doporučujeme aktualizovat Váš prohlížeč na nejnovější verzi.

Další info