A dataset provided by the European Space Agency

Name: 1ES 1927+654: an extreme case of true type 2 Seyfert
Published: 2012-06-07T00:00:00Z

Proposal ID	067186
Title	1ES 1927+654: an extreme case of true type 2 Seyfert
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0671860201
DOI	https://doi.org/10.5270/esa-1lomno9
Principal Investigator, PI	Dr Francesca Panessa
Abstract	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.
Publications	1ES 1927+654: a bare Seyfert 2 \|Gallo L. C. MacMackin C. et al. \| MNRAS \| 433-421 \| 2013 \| 2013MNRAS.433..421G \| http://ui.adsabs.harvard.edu/#abs/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 \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch Eric W. \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z The 450 Day X-Ray Monitoring of the Changing-look AGN 1ES 1927+654 \|Ricci C. Loewenstein M. et al. \| ApJS \| 255-7 \| 2021 \| 2021ApJS..255....7R \| http://ui.adsabs.harvard.edu/#abs/2021ApJS..255....7R A Radio Optical UV and X-Ray View of the Enigmatic Changing-look Active Galactic Nucleus 1ES 1927+654 from Its Pre- to Postflare States \|Laha Sibasish Meyer Eileen et al. \| ApJ \| 931-5 \| 2022 \| 2022ApJ...931....5L \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...931....5L The Host Galaxy and Rapidly Evolving Broad-line Region in the Changing-look Active Galactic Nucleus 1ES 1927+654 \|Li Ruancun Ho Luis C. et al. \| ApJ \| 933-70 \| 2022 \| 2022ApJ...933...70L \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...933...70L A Systematic Study of the Short-term X-Ray Variability of Seyfert Galaxies. I. Diversity of the X-Ray rms Spectra \|Hu Jingwei Jin Chichuan et al. \| ApJ \| 936-105 \| 2022 \| 2022ApJ...936..105H \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...936..105H A Reemerging Bright Soft X-Ray State of the Changing-look Active Galactic Nucleus 1ES 1927+654: A Multiwavelength View \|Ghosh Ritesh Laha Sibasish et al. \| ApJ \| 955-3 \| 2023 \| 2023ApJ...955....3G \| http://ui.adsabs.harvard.edu/#abs/2023ApJ...955....3G Changing-look active galactic nuclei \|Ricci Claudio Trakhtenbrot Benny \| NatAs \| 7-1282 \| 2023 \| 2023NatAs...7.1282R \| http://ui.adsabs.harvard.edu/#abs/2023NatAs...7.1282R The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R Robust constraints on feebly interacting particles using XMM-Newton \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D
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.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2012-06-07T00:00:00Z
Last Update	2025-01-27
Keywords	"tng optical", "scale variations requiring", "optical spectrum", "xmm newton", "bright agn", "1es 1927", "XMM-Newton", "broad line region", "broad emission lines", "ROSAT", "unified models", "xray absorption", "XMM", "excluding variability issues"
Publisher And Registrant	European Space Agency
Credit Guidelines	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