|Title||The nature of high Lx-Lopt sources|
|Author||Prof Keith Mason|
|Description||GT- While the majority of X-ray sources from serendipitous surveys have been identified, a significant fraction (10-20%) have no optical counterpart down to magnitudes, Rvirgul20. These objects have eluded identification to date; possible candidates are diskless quasars, isolated neutron stars, optically-poor clusters, or even a new category of high Lx-Lopt sources not yet discovered. We propose observations of two bright X-ray sources from WGACAT with high optical to X-ray flux ratios (>80, this limit is higher than that for any known class of object). The XMM images will give accurate X-ray positions for these sources which, together with the OM data, provide firm evidence for their identification or for follow-up work, if necessary.|
|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, 2003-09-04T00:00:00Z, 010507, 17.56_20190403_1200. https://doi.org/10.5270/esa-01narjg|