We propose a simultaneous XMM-Newton and TNG optical and Near-Infraredobservation 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 andlarge scale variations requiring the line-of-sight to the nucleus to be freefrom absorption. However, the optical spectrum is typical of Seyfert 2 galaxies.Notably, the measured intrinsic neutral X-ray column density is not enough toobscure the broad-line region. Simultaneous XMM-Newton, optical andNear-Infrared observations are mandatory to confirm the lack of broad emissionlines and the lack of X-ray absorption, excluding variability issues. The lackof a BLR in this bright AGN will be difficult to be interpreted within the current Unified Models.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2011-05-20T06:08:25Z/2011-05-20T14:05:54Z
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 Francesca Panessa, 2012, '1ES 1927+654: an extreme case of true type 2 Seyfert', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-1lomno9
