A dataset provided by the European Space Agency

Name: Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092
Published: 2012-01-26T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	065384
Title	Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0653840301 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0653840401
DOI	https://doi.org/10.5270/esa-870fx7v
Principal Investigator, PI	Dr Giovanni Miniutti
Abstract	During a 2008 XMM-Newton observation the luminous Narrow-Line quasar PHL 1092showed a dramatic X-ray flux drop by a factor ~200 with respect to previousX-ray observations, becoming one of the most extreme X-ray weak QSO (alpha_ox =-2.44), after being X-ray normal (alpha_ox = -1.56) only 4.5 years earlier.The aim of this proposal is to continue our UV and X-ray monitoring of thisextreme source with two 25 ks exposures (one for each visibility window, henceseparated by about 6 months) to unveil the timescale over which transitions fromX-ray weak to normal QSO states take place in this most extraordinary AGN.
Publications	Insights on the X-ray weak quasar phenomenon from XMM-Newton monitoring of PHL 1092 \|Miniutti G. Brandt W. N. et al. \| MNRAS \| 425-1718 \| 2012 \| 2012MNRAS.425.1718M \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.425.1718M 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 Ensemble X-ray variability of active galactic nuclei. II. Excess variance and updated structure function \|Vagnetti F. Middei R. et al. \| A&A \| 593-55 \| 2016 \| 2016A&A...593A..55V \| http://ui.adsabs.harvard.edu/#abs/2016A&A...593A..55V 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 AGN spectral states from simultaneous UV and X-ray observations by XMM-Newton \|Svoboda J. Guainazzi M. \| A&A \| 603-127 \| 2017 \| 2017A&A...603A.127S \| http://ui.adsabs.harvard.edu/#abs/2017A&A...603A.127S 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 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	2010-07-07T21:51:15Z/2010-12-30T14:33:40Z
Version	21.51_20241115_1113
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	2012-01-26T00:00:00Z
Last Update	2026-07-09
Keywords	"XMM-Newton", "xray flux drop", "alpha_ox variations", "2008 xmm newton", "XMM", "xray weak", "extraordinary agn", "visibility window", "normal qso"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Giovanni Miniutti, 2012, 'Monitoring of the extreme alpha_ox variations in the luminous NL QSO PHL 1092', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-870fx7v
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.