|Title||Observing Aql X-1 to understand the hard X-ray emission from NS transients|
|Author||Dr John Tomsick|
|Description||At low luminosities, the X-ray spectra of neutron star (NS) LMXB transients often contain two components: one is due to thermal emission from the NS surface and is reasonably well-understood, while the other is a hard power-law of unknown origin. Recently, observations of Cen X-4 in quiescence with XMM-Newton and the Nuclear Spectroscopic Telescope Array (NuSTAR) have provided the first look at the broadband spectrum. The hard component is sharply cutoff above 10 keV and is consistent with a bremsstrahlung emission mechanism. We propose a joint XMM-Newton, NuSTAR, and Swift Target of Opportunity program to observe Aql X-1 in order to compare the broadband spectrum from this system to that of Cen X-4.|
|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, 2017-10-13T22:00:00Z, 074352, PPS_NOT_AVAILABLE. https://doi.org/10.5270/esa-xie59bd|