|Title||1ES 1927+654: an extreme case of true type 2 Seyfert|
|Author||Dr Francesca Panessa|
|Description||We propose a simultaneous XMM-Newton and TNG optical and Near-Infrared observation of 1ES 1927+654, a type 2 Seyfert galaxy with no X-ray absorption. The ROSAT and Chandra observations of this source revealed persistent, rapid and large scale variations requiring the line-of-sight to the nucleus to be free from absorption. However, the optical spectrum is typical of Seyfert 2 galaxies. Notably, the measured intrinsic neutral X-ray column density is not enough to obscure the broad-line region. Simultaneous XMM-Newton, optical and Near-Infrared observations are mandatory to confirm the lack of broad emission lines and the lack of X-ray absorption, excluding variability issues. The lack of a BLR in this bright AGN will be difficult to be interpreted within the current Unified Models.|
|Publication||1ES 1927+654: a bare Seyfert 2 . Gallo, L. C., MacMackin, C., et all. . MNRAS . 433-421 . 2013 . 2013MNRAS.433..421G ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2012-06-07T00:00:00Z, 067186, 17.56_20190403_1200. https://doi.org/10.5270/esa-1lomno9|