|Title||X-RAY SPECTRUM OF A PERIODIC QUASAR FROM THE DES: TESTING THE BINARY BLACK HOLE|
|Author||Prof Xin Liu|
|Description||We propose joint NuSTAR-XMM-Newton observations of a periodically variable quasar recently found from the Dark Energy Survey (DES). The target is unique because its periodicity is highly significant and robust thanks to the sensitive DES imaging and a virgul20-yr long time baseline by combining DES with SDSS. The high sensitivity and long baseline are both crucial to rejecting false positives caused by quasars stochastic red noise variability. The proposed X-ray observations will test and distinguish two generic but different sets of models of circumbinary accretion disk simulations (a central cavity vs. minidisks), which predict dramatically different X-ray fluxes. The results will provide an independent and complementary test for the binary black hole hypothesis to explain the periodicity.|
|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, 2021-08-27T00:00:00Z, 087081, 18.02_20200221_1200. https://doi.org/10.5270/esa-[xxxxxxx]|