|Investigating the vertical structure of the accretion disc wind in Hercules X-1
|Mr Peter Kosec
|Accretion disc winds in X-ray binaries are not spherically symmetric structures, but their solid angle is difficult to determine because we usually only sample specific lines of sight. We can overcome this problem by studying Hercules X-1, a binary with a precessing warped disc. Its disc wind is strongly varying within a precession cycle, indicating a small wind launching angle and strong vertical stratification. However, the available data originate from many precession cycles and could be plagued by long-term variability effects. With this proposal, we aim to finely sample the wind vertical structure within a single precession cycle, free of any long term deviations, to understand the wind launching angle, launching mechanism and to measure accurately the mass outflow rate.
|No observations found associated with the current proposal
|EMOS1, EMOS2, EPN, OM, RGS1, RGS2
|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
|European Space Agency, 2021, 086544, 19.17_20220121_1250. https://doi.org/10.57780/esa-raxmflz