| Proposal ID | 076418 |
| Title | Tracing the accretion disk using Fe lines and kHz QPOs |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0764180201 |
| DOI | https://doi.org/10.5270/esa-1fddync |
| Principal Investigator, PI | Dr Andrea Sanna |
| Abstract | Fe K- lines have now been detected in about half a dozen neutron-star accretingX-ray binaries. Under the commonly accepted interpretation, these lines can beused to set tight constrains on the accretion disk geometry and on the radius ofthe neutron star. Using simultaneous XMM-Newton/RXTE observations of 4U 1636-53,we have recently shown that the inner disc radius deduced from thecharacteristic frequency of the timing features and from the Fe-line profiledoes not change consistently with time, contradicting the expected scenario. Itis intriguing that the Fe line appears to behave differently. Here we propose toobserve this system with XMM-Newton three times for 30 ks, simultaneously withNuStar observations. |
| Publications |
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| Instrument | EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2015-08-25T07:14:40Z/2015-09-18T18:06:05Z |
| Version | 21.51_20241115_1113 |
| Mission Description | The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2016-10-06T22:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "4u 1636", "fe line appears", "neutron star", "XMM-Newton", "fe lines", "set tight constrains", "accretion disk geometry", "XMM", "characteristic frequency", "khz qpos", "accretion disk", "xmm newton", "fe line profile" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Andrea Sanna, 2016, 'Tracing the accretion disk using Fe lines and kHz QPOs', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-1fddync |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |