| Proposal ID | 067118 |
| Title | Probing the gravitational field around neutron stars with Fe lines and kHz QPOs |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0671180201 |
| DOI | https://doi.org/10.5270/esa-0kivalg |
| Principal Investigator, PI | Prof Mariano Mendez |
| Abstract | Broad Fe lines have been detected in 10 neutron-star LMXBs. In two sources theFe line and kHz QPOs give consistent values for the inner radius of theaccretion disc, but measurements were not simultaneous. Using XMM-Newton/RXTEand Chandra/RXTE simultaneously, we have recently shown that in the LMXB 4U1636-53 the Fe line and the kHz QPO yield different disc radii. The frequenciesof the kHz QPOs correlate with the disc radius inferred from broad-band spectra,while the Fe line appears to change independently. We propose 5 simultaneousXMM-Newton/RXTE observations of the LMXB 4U 1728-34 with both a broad Fe lineand kHz QPOs, using the long-term variability of this source to test thedynamics and correlation of the radii inferred from the line and the kHz QPOs. |
| Publications |
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| Instrument | EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2011-08-28T14:08:20Z/2011-10-07T13:16:25Z |
| Version | 17.56_20190403_1200 |
| 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 | 2012-10-26T00:00:00Z |
| Last Update | 2026-03-04 |
| Keywords | "neutron stars", "lmxb 4u 1728", "khz qpo", "radii inferred", "broad fe line", "fe lines", "khz qpos correlate", "XMM-Newton", "neutron star lmxbs", "lmxb 4u 1636", "disc radii", "xmm newton", "khz qpos", "fe line appears", "term variability", "accretion disc", "XMM", "inner radius", "disc radius inferred", "broad fe lines", "fe line", "broad band spectra", "gravitational field" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Mariano Mendez, 2012, 'Probing the gravitational field around neutron stars with Fe lines and kHz QPOs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-0kivalg |