Understanding the dynamics and energetics of low-power (FR I) radio galaxies isessential to constrain their feedback role in galaxy groups and clusters, but ithas long been known that their relativistic electron population and magneticfields cannot provide enough pressure to balance the measured external pressureif at equipartition. Our recent XMM-Newton studies of FR I radio-galaxyenvironments reveal the first direct evidence that entrainment of material fromthe hot-gas environment provides the necessary particle population: the apparentpressure imbalance is linked to radio morphology. We propose to observe a smallsample of bridged-morphology FRIs to test the prediction that their lobes shouldbe close to pressure balance at equipartition.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2008-06-12T08:18:36Z/2008-08-13T16:54:56Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Judith Croston, 2009, 'Resolving the mystery of FRI particle content', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-2tcmyo2
