|Title||X-rays and mode changes in PSR J2021+4026, the first variable gamma-ray pulsar|
|Author||Dr Massimiliano Razzano|
|Description||Among the radio-quiet pulsars discovered by Fermi, an unique source is PSR J2021+4026 in the Gamma Cygni supernova remnant. This pulsar has shocked the high-energy astrophysics community by featuring a simultaneous change in flux and frequency derivative, breaking the long-standing paradigm of pulsars as stable gamma-ray sources. Monitoring the gamma-ray mode changes at different energies is key to understand if such events are due to global or local changes in the magnetosphere geometry and-or configurations. We propose a ToO with XMM to study the X-ray spectral and timing behaviour of PSR J2021+4026 following a mode change. This will provide the first contemporary X and gamma-ray study of pulsar mode changes, key to decrypt this intriguing, but still obscure, aspect of pulsar physics.|
|Publication||X-Ray Study of Variable Gamma-Ray Pulsar PSR J2021+4026 . Wang, H. H., Takata, J., et all. . ApJ . 856-98 . 2018 . 2018ApJ...856...98W ,
Spectral characterization of the non-thermal X-ray emission of gamma-ray pulsars . Coti Zelati, Francesco, Torres, Diego F., et all. . MNRAS . 492-1025 . 2020 . 2020MNRAS.492.1025C ,
|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, 2017-01-11T23:00:00Z, 076385, 17.56_20190403_1200. https://doi.org/10.5270/esa-dx15whq|