| Name | 076121 |
| Title | Is there a minimum Mach number for particle acceleration in cluster shocks |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0761210101 |
| DOI | https://doi.org/10.5270/esa-87duybt |
| Author | European Space Agency |
| Description | The largest collisionless shocks detected in the Universe are those in clusters of galaxies, which show up in X-rays through their temperature and brighness jumps, and in radio through synchrotron emission. The latter are called relics, and they indicate that particles are accelerated by the shock. It is not clear why some shocks emit radio emission and others do not. According to theory only shocks with Mach numbers M>2.24 should be able to accelerate particles. Indeed most relics seem to have Mach numbers exceeding this limit. But recently Suzaku found evidence that the SE relic in A3667 has Mach number 1.75. This needs further study by XMM-Newton with a 100 ks pointing targeting this relic, thereby completing the XMM map of this important cluster. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2015-10-12T08:26:49Z/2015-10-13T05:31:49Z |
| Version | 17.56_20190403_1200 |
| Mission Description | The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2016-11-04T23:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2016, Is There A Minimum Mach Number For Particle Acceleration In Cluster Shocks, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-87duybt |