| Name | 050590 |
| Title | Probing the X-ray properties of Extend Star Clusters in the far Halo of M31 |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0505900101 |
| DOI | https://doi.org/10.5270/esa-si3ys5k |
| Author | European Space Agency |
| Description | We have recently discovered a population of old star clusters in the halo of M31 which have colours and magnitudes typical of GCs but are much more extended spatially. These clusters have no known analogue in the Milky Way and their origin remains a mystery. We seek to study their X-ray properties distinguish between competing scenarios for their evolution. For example, if these clusters formed as diffuse systems, their relatively low stellar densities would lead us to expect a low X-ray source population, and raise the question, do they have dark matter halos? Alternatively have they been heated to their current state by a large population of binaries and/or black holes, which would make these clusters rich X-ray sources and viable test beds of modified gravitational theories. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2007-07-21T11:03:59Z/2008-02-09T19:47:07Z |
| 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 | 2009-03-07T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2009, Probing The X-Ray Properties Of Extend Star Clusters In The Far Halo Of M31, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-si3ys5k |