|Title||Observing the Extreme ULX Circinus ULX5 in an Extreme Flux State|
|Author||Dr Dominic Walton|
|Description||The NuSTAR observatory recently detected a previously unidentified extreme (L[x,peak] ~ 2e40 erg-s) ultraluminous X-ray source (ULX) in the outskirts of Circinus: Circinus ULX5. The current data support a simple disc-corona model, reminiscent of that invoked for Galactic binaries, implying the presence of a massive (~90 Msun) black hole accreting around it.s Eddington limit. This is an exciting possibility, as the presence of such a black hole may pose a challenge to our current understanding of stellar evolution. We propose to test this scenario by undertaking a short 40 ks XMM ToO observation of ULX5 in an extreme low flux state. Should this scenario be correct, the source should transition to a regular disc-dominated state, which can easily be identified by XMM.|
|Publication||CG X-1: An Eclipsing Wolf--Rayet ULX in the Circinus Galaxy . Qiu, Yanli, Soria, Roberto, et all. . ApJ . 877-57 . 2019 . 2019ApJ...877...57Q ,
The exceptional X-ray evolution of SN 1996cr in high resolution . Quirola-Vu00e1squez, J., Bauer, F. E., et all. . MNRAS . 490-4536 . 2019 . 2019MNRAS.490.4536Q ,
|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, 2019-02-26T23:00:00Z, 078095, 17.56_20190403_1200. https://doi.org/10.5270/esa-rqfs8mp|