We request one 130ks XMM-Newton observation of a radio-flaringhigh-synchrotron-peaked BL Lac object that is affected by the so-called Dopplercrisis. For this intriguing class of objects, previous radio observations havetypically found sub-luminal apparent jet speeds while their bright, variable,very-high-energy TeV gamma-ray emission and multiwavelength spectral modelssuggest very-high Doppler factors. We will observe such an object with the EventHorizon Telescope (EHT) as part of a triggered proposal. In order to understandthe multiwavelength emission and possibly resolve the Doppler crisis for thissource we request quasi-simultaneous XMM-Newton observations, which will providean independent probe of the Doppler factor by studying minute-scale variations in the X-ray light curve.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2023-02-27T23:44:29Z/2023-03-01T13:36:09Z
Version
20.09_20221024_1724
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, Mr Florian Eppel, 2024, 'Blazar Flares in Crisis at Multiwavelengths', 20.09_20221024_1724, European Space Agency, https://doi.org/10.57780/esa-l7x8c31
