X-ray Reverberation tracks light travel delay between the continuum and thereflected iron line. Short (1e2-1e3 s) iron band delays have been observed inmany sources and are attributed to relativistic reverberation. The brightNGC4151 was the first to show these lags, but recent data is not consistent withsimple reverberation models. On longer time scales, the narrow Fe K line wasalso found to lag the continuum by 3 days. XMM has been instrumental in bothmeasurements. The delays at intermediate timescales (hours to 1 day) havehowever been inaccessible due to visibility constraints. Here, we propose toobserve NGC4151 for two consecutive orbits to bridge this gap. This will be asignificant step towards building a complete picture of the circumnuclear reprocessing material.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2020-11-26T06:46:16Z/2020-11-29T18:29:34Z
Version
18.02_20200221_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.
European Space Agency, Dr Abderahmen Zoghbi, 2022, 'Linking the Short and Long delays in NGC 4151', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-uk7yt9a
