|Title||Taking the beat of the UNSeEN (The Ultraluminous NS populatioN of ULXs)|
|Author||Prof Gian Luca Israel|
|Description||Due to their super-Eddington (L_Edd) X-ray luminosity ULXs have long been considered the ideal sample where to look for BHs of intermediate mass. The discovery of three ULXs showing pulsations unambiguously associated them to NSs exceeding 500 times their L_Edd. These discoveries challenge our understanding of accretion physics and pose a key question about the nature of the ULXs: are they a population hosting both BHs and NSs, or is there a dominant new NS population with extreme properties? This proposal involves a large fraction of the ULX community and is aimed at answering the above question by tripling the number of ULXs where sensitive searches for X-ray pulsations and cyclotron features can be carried out. We expect to detect 2-3 new PULXs, thus doubling the current sample.|
|Publication||A Long Hard-X-Ray Look at the Dual Active Galactic Nuclei of M51 with NuSTAR . Brightman, M., Balokovic, M., et all. . ApJ . 867-110 . 2018 . 2018ApJ...867..110B ,
M51 ULX-7: superorbital periodicity and constraints on the neutron star magnetic field . Vasilopoulos, G., Lander, S. K., et all. . MNRAS . 491-4949 . 2020 . 2020MNRAS.491.4949V ,
The Ultraluminous X-Ray Sources Population of the Galaxy NGC 7456 . Pintore, F., Marelli, M., et all. . ApJ . 890-166 . 2020 . 2020ApJ...890..166P ,
Spectral Modeling of Charge Exchange in the Central Region of M51 . Yang, Hang, Zhang, Shuinai, . ApJ . 894-22 . 2020 . 2020ApJ...894...22Y ,
Discovery of a 2.8 s Pulsar in a 2 Day Orbit High-mass X-Ray Binary Powering the Ultraluminous X-Ray Source ULX-7 in M51 . Rodru00edguez Castillo, G. A., Israel, G. L., et all. . ApJ . 895-60 . 2020 . 2020ApJ...895...60R ,
Swift Monitoring of M51: A 38 day Superorbital Period for the Pulsar ULX7 and a New Transient Ultraluminous X-Ray Source . Brightman, Murray, Earnshaw, Hannah, et all. . ApJ . 895-127 . 2020 . 2020ApJ...895..127B ,
|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, 2020-01-17T23:00:00Z, 082445, 17.56_20190403_1200. https://doi.org/10.5270/esa-govki6q|