|Title||A Request for a Re-observation of a Distant X-ray Luminous Cluster of Galaxies|
|Author||Prof Melville Ulmer|
|Description||We are requesting time to re-observe a rich cluster of galaxies (CL 1257+4738; z = 0.866) that we have observed with XMM-newton (obsID 0413380), but we only had much less (how much is yet to be determined) than 16 ksec of usable data out of a 83 ksec observation. With these data we confirm the existence of diffuse X-ray emission. We tentatively conclude that the cluster is unusually cool for its bolometric luminosity and compared to all other clusters at this redshift. More observation time is needed to confirm or deny this result. The spectrum is so soft and the Chandra observation so short that we could not derive a spectrum from the Chandra data.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2010-01-17T00:00:00Z, 055109, 17.56_20190403_1200. https://doi.org/10.5270/esa-m5dxsa3|