A dataset provided by the European Space Agency

Name: Are strongly variable Seyfert 2 galaxies really AGN without a Broad Line Region?
Published: 2007-12-08T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	040246
Title	Are strongly variable Seyfert 2 galaxies really AGN without a Broad Line Region?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0402460201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0402460401
DOI	https://doi.org/10.5270/esa-5e6uk3t
Principal Investigator, PI	Dr Francesca Panessa
Abstract	Strong amplitude optical brightness variability has been found in a sample ofSeyfert 2 galaxies (Naked AGN, Hawkins 2004). The variability suggests thatthe nuclear source is seen directly, contradicting the complete absence of broademission lines as simple Unified Models for AGN would predict. Alternatively theBroad Line Region might be missing in these sources. The proposed XMM-Newtonobservations offer a priviledged window into the central engine to understandthe absorption properties of these objects and compare them to their opticalappearance.
Publications	Unabsorbed Seyfert 2 galaxies: the case of naked AGN \|Panessa F. Carrera F. J. et al. \| MNRAS \| 398-1951 \| 2009 \| 2009MNRAS.398.1951P \| http://ui.adsabs.harvard.edu/#abs/2009MNRAS.398.1951P A Multiwavelength Study of a Sample of 70 mum Selected Galaxies in the COSMOS Field. I. Spectral Energy Distributions and Luminosities \|Kartaltepe Jeyhan S. Sanders D. B. et al. \| ApJ \| 709-572 \| 2010 \| 2010ApJ...709..572K \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...709..572K The XMM Cluster Survey: optical analysis methodology and the first data release \|Mehrtens Nicola Romer A. Kathy et al. \| MNRAS \| 423-1024 \| 2012 \| 2012MNRAS.423.1024M \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.423.1024M An All-Sky Atlas of Radio/X-ray Associations \|Flesch E. \| PASA \| 27-283 \| 2010 \| 2010PASA...27..283F \| http://ui.adsabs.harvard.edu/#abs/2010PASA...27..283F The XMM Cluster Survey: X-ray analysis methodology \|Lloyd-Davies E. J. Romer A. Kathy et al. \| MNRAS \| 418-14 \| 2011 \| 2011MNRAS.418...14L \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.418...14L CAIXA: a catalogue of AGN in the XMM-Newton archive. III. Excess variance analysis \|Ponti G. Papadakis I. et al. \| A&A \| 542-83 \| 2012 \| 2012A&A...542A..83P \| http://ui.adsabs.harvard.edu/#abs/2012A&A...542A..83P Exospheric solar wind charge exchange as seen by XMM-Newton \|Carter J. A. Semba S. \| AN \| 333-313 \| 2012 \| 2012AN....333..313C \| http://ui.adsabs.harvard.edu/#abs/2012AN....333..313C The cosmological analysis of X-ray cluster surveys - II. Application of the CR-HR method to the XMM archive \|Clerc N. Sadibekova T. et al. \| MNRAS \| 423-3561 \| 2012 \| 2012MNRAS.423.3561C \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.423.3561C Classification of X-Ray Sources in the XMM-Newton Serendipitous Source Catalog \|Lin Dacheng Webb Natalie A. \| ApJ \| 756-27 \| 2012 \| 2012ApJ...756...27L \| http://ui.adsabs.harvard.edu/#abs/2012ApJ...756...27L An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities \|Henley David B. Shelton Robin L. \| ApJS \| 202-14 \| 2012 \| 2012ApJS..202...14H \| http://ui.adsabs.harvard.edu/#abs/2012ApJS..202...14H Simultaneous X-ray and optical observations of true type 2 Seyfert galaxies \|Bianchi Stefano Panessa Francesca et al. \| MNRAS \| 426-3225 \| 2012 \| 2012MNRAS.426.3225B \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.426.3225B Properties of the integrated spectrum of serendipitous 2XMM catalog sources \|Chaudhary P. Brusa M. et al. \| A&A \| 518-58 \| 2010 \| 2010A&A...518A..58C \| http://ui.adsabs.harvard.edu/#abs/2010A&A...518A..58C Rest-frame stacking of 2XMM catalog sources. Properties of the Fe Kalpha line \|Chaudhary P. Brusa M. et al. \| A&A \| 537-6 \| 2012 \| 2012A&A...537A...6C \| http://ui.adsabs.harvard.edu/#abs/2012A&A...537A...6C An XMM-Newton Survey of the Soft X-Ray Background. III. The Galactic Halo X-Ray Emission \|Henley David B. Shelton Robin L. \| ApJ \| 773-92 \| 2013 \| 2013ApJ...773...92H \| http://ui.adsabs.harvard.edu/#abs/2013ApJ...773...92H Automatic Classification of Time-variable X-Ray Sources \|Lo Kitty K. Farrell Sean et al. \| ApJ \| 786-20 \| 2014 \| 2014ApJ...786...20L \| http://ui.adsabs.harvard.edu/#abs/2014ApJ...786...20L The diversity of quasars unified by accretion and orientation \|Shen Yue Ho Luis C. \| Natur \| 513-210 \| 2014 \| 2014Natur.513..210S \| http://ui.adsabs.harvard.edu/#abs/2014Natur.513..210S 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 Origin of the Hot Gas in the Galactic Halo: Testing Galactic Fountain Models X-Ray Emission \|Henley David B. Shelton Robin L. et al. \| ApJ \| 800-102 \| 2015 \| 2015ApJ...800..102H \| http://ui.adsabs.harvard.edu/#abs/2015ApJ...800..102H Sunyaev-Zeldovich effect or not? Detecting the main foreground effect of most galaxy clusters \|Xiao Weike Chen Chen et al. \| MNRAS \| 432-41 \| 2013 \| 2013MNRAS.432L..41X \| http://ui.adsabs.harvard.edu/#abs/2013MNRAS.432L..41X X-ray reverberation around accreting black holes \|Uttley P. Cackett E. M. et al. \| A&ARv \| 22-72 \| 2014 \| 2014A&ARv..22...72U \| http://ui.adsabs.harvard.edu/#abs/2014A&ARv..22...72U The Interaction of the Fermi Bubbles with the Milky Ways Hot Gas Halo \|Miller Matthew J. Bregman Joel N. \| ApJ \| 829-9 \| 2016 \| 2016ApJ...829....9M \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...829....9M SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV \|Clerc N. Merloni A. et al. \| MNRAS \| 463-4490 \| 2016 \| 2016MNRAS.463.4490C \| http://ui.adsabs.harvard.edu/#abs/2016MNRAS.463.4490C 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 Anisotropy of the galaxy cluster X-ray luminosity-temperature relation \|Migkas Konstantinos Reiprich Thomas H. \| A&A \| 611-50 \| 2018 \| 2018A&A...611A..50M \| http://ui.adsabs.harvard.edu/#abs/2018A&A...611A..50M The XMM Cluster Survey: Present status and latest results \|Viana P. T. P. Mehrtens N. et al. \| AN \| 334-462 \| 2013 \| 2013AN....334..462V \| http://ui.adsabs.harvard.edu/#abs/2013AN....334..462V Testing emergent gravity on galaxy cluster scales \|Tamosiunas Andrius Bacon David et al. \| JCAP \| 5-53 \| 2019 \| 2019JCAP...05..053T \| http://ui.adsabs.harvard.edu/#abs/2019JCAP...05..053T Chandra Follow-up of the SDSS DR8 Redmapper Catalog Using the MATCha Pipeline \|Hollowood Devon L. Jeltema Tesla et al. \| ApJS \| 244-22 \| 2019 \| 2019ApJS..244...22H \| http://ui.adsabs.harvard.edu/#abs/2019ApJS..244...22H Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters \|Palmese A. Annis J. et al. \| MNRAS \| 493-4591 \| 2020 \| 2020MNRAS.493.4591P \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.493.4591P X-ray properties of the X-CLASS-redMaPPer galaxy cluster sample: the luminosity-temperature relation \|Molham Mona Clerc Nicolas et al. \| MNRAS \| 494-161 \| 2020 \| 2020MNRAS.494..161M \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.494..161M A joint SZ-X-ray-optical analysis of the dynamical state of 288 massive galaxy clusters \|Zenteno A. Hernu00e1ndez-Lang D. et al. \| MNRAS \| 495-705 \| 2020 \| 2020MNRAS.495..705Z \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.495..705Z Multiwavelength classification of X-ray selected galaxy cluster candidates using convolutional neural networks \|Kosiba Matej Lieu Maggie et al. \| MNRAS \| 496-4141 \| 2020 \| 2020MNRAS.496.4141K \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.496.4141K SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release \|Clerc N. Kirkpatrick C. C. et al. \| MNRAS \| 497-3976 \| 2020 \| 2020MNRAS.497.3976C \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.497.3976C Constraining the Milky Way Mass with Its Hot Gaseous Halo \|Guo Fulai Zhang Ruiyu \| ApJ \| 904-14 \| 2020 \| 2020ApJ...904L..14G \| http://ui.adsabs.harvard.edu/#abs/2020ApJ...904L..14G An X-Ray- and SZ-bright Diffuse Source toward M31: A Local Hot Bridge \|Qu Zhijie Huang Rui et al. \| ApJ \| 907-14 \| 2021 \| 2021ApJ...907...14Q \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...907...14Q 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 Solar Cycle Temporal Variation of the Solar Wind Charge Exchange X-Ray Lines \|Qu Zhijie Koutroumpa Dimitra et al. \| ApJ \| 930-21 \| 2022 \| 2022ApJ...930...21Q \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...930...21Q Dynamical state of galaxy clusters evaluated from X-ray images \|Yuan Z. S. Han J. L. \| MNRAS \| 513-3013 \| 2022 \| 2022MNRAS.513.3013Y \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.513.3013Y 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 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	2006-11-13T00:29:07Z/2006-11-15T18:00:53Z
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	2007-12-08T00:00:00Z
Last Update	2026-07-09
Keywords	"simple unified models", "broad line region", "central engine", "broad emission lines", "XMM-Newton", "nuclear source", "absorption properties", "variable seyfert", "complete absence", "XMM", "priviledged window", "xmm newton"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Francesca Panessa, 2007, 'Are strongly variable Seyfert 2 galaxies really AGN without a Broad Line Region?', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-5e6uk3t
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.