A dataset provided by the European Space Agency

Name: A Changing-Look AGN Caught in the Act
Published: 2017-12-29T23:00:00Z

Proposal ID	078294
Title	A Changing-Look AGN Caught in the Act
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0782940101
DOI	https://doi.org/10.5270/esa-not7rgk
Principal Investigator, PI	Ms Triana Almeyda
Abstract	We propose XMM-Newton observations of a newly discovered changing look AGN, NGC6418. These rare objects undergo dramatic changes in their optical spectra andother properties, including the X-ray absorbing column density. Optical and IRobservations of NGC 6418 showed that it changed its look from Seyfert Type 1.9to Type 1 and back again within 3 years. These changes involved both largevariations in intrinsic luminosity and clear changes in obscuration. Theseobservations will provide information on the absorbing column, the X-rayluminosity, and spectral shape at a known optical state.
Publications	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 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 Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE \|Ma Xiangyao Zhang Yanxia et al. \| AJ \| 168-210 \| 2024 \| 2024AJ....168..210M \| http://ui.adsabs.harvard.edu/#abs/2024AJ....168..210M New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2016-11-18T20:17:08Z/2016-11-19T02:40:28Z
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	2017-12-29T23:00:00Z
Last Update	2025-08-04
Keywords	"XMM", "xray luminosity", "XMM-Newton", "seyfert type", "rare objects", "xmm newton", "spectral shape", "ngc 6418", "changing look agn", "NGC", "absorbing column", "optical spectra"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Ms Triana Almeyda, 2017, 'A Changing-Look AGN Caught in the Act', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-not7rgk