|Title||Two candidates radio-quiet millisecond pulsars in Fermi unassociated sources|
|Author||Dr Fabio Acero|
|Description||Multi-wavelength observations have been the key to identifying the many unassociated gamma-ray sources detected by the Fermi-LAT telescope. In two of the top ten brightest Fermi sources that remain unassociated, optical observations of their error ellipses have revealed variable stars each coincident with an X-ray source detected by Swift. In both cases, a putative binary orbital period of has been identified from the optical variability, indicating that these are candidate millisecond pulsars (MSPs) that may be the counterparts to the bright gamma-ray sources. However, unlike all previous gamma-ray MSPs detected by Fermi, there is no indication of radio emission from either source.|
|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, 2015-06-27T22:00:00Z, 074293, 17.56_20190403_1200. https://doi.org/10.5270/esa-4ismfq9|