For a long time high-redshift BL Lac objects were deemed not to exist. Fermishowed us that there is r^ant population of BL Lacs with redshift beyond 1.0.Some of them belong to the HSP class and are among the hardest gamma-ray sourcesdetected by Fermi showing emission up and beyond 100 GeV. This makes them themost luminous BL Lacs ever detected and rates them among the most powerfulaccelerators in the Universe. We plan to observe the extreme BL Lac 2FHLJ2146.6-1345 simultaneously with NuSTAR, XMM-Newton, and SARA. This will provideunprecedented coverage of the synchrotron peak from nIR to hard X-ray allowingus: to understand the nature and the energetic of this object, to answerlong-standing questions on the blazar sequence and to use it as probe of the extragalactic background.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2018-05-18T05:10:31Z/2018-05-18T09:53:51Z
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.
European Space Agency, Dr Marco Ajello, 2019, 'BL LAC OBJECTS AT THE HIGHEST REDSHIFTS', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-p89agpo
