1ES 1927+654, the first changing-look AGN caught in the act of changing phases,has undergone extreme spectral changes over the last 3 years, including thedestruction and recreation of the X-ray corona, possibly due to a tidaldisruption event in a pre-existing AGN accretion disk. The latest XMM-Newtonobservation is similar to the pre-outburst observation from May 2011, butreveals a hint of an iron line, which was notably missing in the 2011observation. We propose one more simultaneous XMM-Newton/NuSTAR campaign of 1ES1927+654, totaling 70 ks over two 35 ks observations, to probe the late-stageevolution of this paradigm-defying AGN. The hard X-ray spectrum will allow us totrack the heating of a newly-formed corona for the first time and determine whether the iron line has appeared.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2022-07-26T20:30:54Z/2022-08-02T03:51:04Z
Version
20.08_20220509_1852
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, Ms Megan Masterson, 2023, '1ES 1927+654: Constraining the Late Stages of an Extreme Nuclear Transient', 20.08_20220509_1852, European Space Agency, https://doi.org/10.57780/esa-wnw05jb
