A dataset provided by the European Space Agency

Name: COMPLETING THE X-RAY CENSUS OF NEARBY SEYFERT GALAXIES: OUR HIDDEN NEIGHBOURS
Published: 2006-02-10T00:00:00Z

Proposal ID	020465
Title	COMPLETING THE X-RAY CENSUS OF NEARBY SEYFERT GALAXIES: OUR HIDDEN NEIGHBOURS
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204650101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204650201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204650301 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204651101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0204651201
DOI	https://doi.org/10.5270/esa-5gjea8o
Principal Investigator, PI	Dr IAN GEORGE
Abstract	Consideration of the CfA sample of Seyfert galaxies reveals the suprising factthat only half the sample, well studied at most wavelengths, has been observedin the X-ray regime. It is likely these are absorbed sources, and it isimportant to observe these with XMM to redress our picture of low-z AGN. Whilemuch recent work has focussed on obscured AGN at high-z, obscured local sourcesare an important and neglected part of the luminosity function. These localsources also offer the opportunity to observe a level of detail in the X-rayspectra which is currently impossible to study in high-z sources. XMMobservations of local Seyferts complement those at other wavebands & testunification schemes. These sources may also hold secrets undetectable in the more distant counterparts.
Publications	The X-ray variability and the near-IR to X-ray spectral energy distribution of four low luminosity Seyfert 1 galaxies \|Papadakis I. E. Ioannou Z. et al. \| A&A \| 490-995 \| 2008 \| 2008A&A...490..995P \| http://ui.adsabs.harvard.edu/#abs/2008A&A...490..995P XMM-Newton observations of Seyfert galaxies from the Palomar spectroscopic survey: the X-ray absorption distribution \|Akylas A. Georgantopoulos I. \| A&A \| 500-999 \| 2009 \| 2009A&A...500..999A \| http://ui.adsabs.harvard.edu/#abs/2009A&A...500..999A A Multi-wavelength Study of the Nature of Type 1.8/1.9 Seyfert Galaxies \|Trippe M. L. Crenshaw D. M. et al. \| ApJ \| 725-1749 \| 2010 \| 2010ApJ...725.1749T \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...725.1749T The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue \|Watson M. G. Schroder A. C. et al. \| A&A \| 493-339 \| 2009 \| 2009A&A...493..339W \| http://ui.adsabs.harvard.edu/#abs/2009A&A...493..339W On the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton \|Guainazzi Matteo Bianchi Stefano \| MNRAS \| 374-1290 \| 2007 \| 2007MNRAS.374.1290G \| http://ui.adsabs.harvard.edu/#abs/2007MNRAS.374.1290G The X-ray Energy Dependence of the Relation Between Optical and X-ray Emission in Quasars \|Young M. Elvis M. \| ApJ \| 708-1388 \| 2010 \| 2010ApJ...708.1388Y \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...708.1388Y An Extremely Luminous Panchromatic Outburst from the Nucleus of a Distant Galaxy \|Levan A. J. Tanvir N. R. et al. \| Sci \| 333-199 \| 2011 \| 2011Sci...333..199L \| http://ui.adsabs.harvard.edu/#abs/2011Sci...333..199L New constraints on the X-ray spectral properties of type 1 active galactic nuclei \|Scott A. E. Stewart G. C. et al. \| MNRAS \| 417-992 \| 2011 \| 2011MNRAS.417..992S \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.417..992S Statistical evaluation of the flux cross-calibration of the XMM-Newton EPIC cameras \|Mateos S. Saxton R. D. et al. \| A&A \| 496-879 \| 2009 \| 2009A&A...496..879M \| http://ui.adsabs.harvard.edu/#abs/2009A&A...496..879M Understanding Dual Active Galactic Nucleus Activation in the nearby Universe \|Koss Michael Mushotzky Richard et al. \| ApJ \| 746-22 \| 2012 \| 2012ApJ...746L..22K \| http://ui.adsabs.harvard.edu/#abs/2012ApJ...746L..22K X-ray colour-colour selection for heavily absorbed active galactic nuclei \|Brightman Murray Nandra Kirpal \| MNRAS \| 422-1166 \| 2012 \| 2012MNRAS.422.1166B \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.422.1166B 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 Comparison between the luminosity functions of X-ray and OIII selected AGN \|Georgantopoulos I. Akylas A. \| A&A \| 509-38 \| 2010 \| 2010A&A...509A..38G \| http://ui.adsabs.harvard.edu/#abs/2010A&A...509A..38G The Difference in Narrow Fe Kalpha Line Emission Between Seyfert 1 and Seyfert 2 Galaxies \|Liu Teng Wang Jun-Xian \| ApJ \| 725-2381 \| 2010 \| 2010ApJ...725.2381L \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...725.2381L 2XMM ultraluminous X-ray source candidates in nearby galaxies \|Walton D. J. Roberts T. P. et al. \| MNRAS \| 416-1844 \| 2011 \| 2011MNRAS.416.1844W \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.416.1844W Investigating the Nuclear Obscuration in Two Types of Seyfert 2 Galaxies \|Shu X. W. Wang J. X. et al. \| ApJ \| 657-167 \| 2007 \| 2007ApJ...657..167S \| http://ui.adsabs.harvard.edu/#abs/2007ApJ...657..167S Are Optically Selected Quasars Universally X-Ray Luminous? X-Ray-UV Relations in Sloan Digital Sky Survey Quasars \|Gibson Robert R. Brandt W. N. \| ApJ \| 685-773 \| 2008 \| 2008ApJ...685..773G \| http://ui.adsabs.harvard.edu/#abs/2008ApJ...685..773G Search for narrow energy-shifted lines in AGN spectra in the XMM-Newton archive \|Longinotti A. L. Bianchi S. et al. \| AN \| 327-1020 \| 2006 \| 2006AN....327.1020L \| http://ui.adsabs.harvard.edu/#abs/2006AN....327.1020L Statistics of relativistically broadened Fe Kalpha lines in AGN \|Guainazzi M. Bianchi S. \| AN \| 327-1032 \| 2006 \| 2006AN....327.1032G \| http://ui.adsabs.harvard.edu/#abs/2006AN....327.1032G Three-year Swift-BAT Survey of Active Galactic Nuclei: Reconciling Theory and Observations? \|Burlon D. Ajello M. et al. \| ApJ \| 728-58 \| 2011 \| 2011ApJ...728...58B \| http://ui.adsabs.harvard.edu/#abs/2011ApJ...728...58B Uncovering Obscured Active Galactic Nuclei in Homogeneously Selected Samples of Seyfert 2 Galaxies \|LaMassa Stephanie M. Heckman T. M. et al. \| ApJ \| 729-52 \| 2011 \| 2011ApJ...729...52L \| http://ui.adsabs.harvard.edu/#abs/2011ApJ...729...52L The Sloan Digital Sky Survey/XMM-Newton Quasar Survey: Correlation Between X-Ray Spectral Slope and Eddington Ratio \|Risaliti G. Young M. \| ApJ \| 700-6 \| 2009 \| 2009ApJ...700L...6R \| http://ui.adsabs.harvard.edu/#abs/2009ApJ...700L...6R A large catalogue of ultraluminous X-ray source candidates in nearby galaxies \|Walton D. J. Gladstone J. C. et al. \| AN \| 332-354 \| 2011 \| 2011AN....332..354W \| http://ui.adsabs.harvard.edu/#abs/2011AN....332..354W An XMM-Newton spectral survey of 12 mum selected galaxies - I. X-ray data \|Brightman Murray Nandra Kirpal \| MNRAS \| 413-1206 \| 2011 \| 2011MNRAS.413.1206B \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.413.1206B 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 Fe Kalpha line profile in AGNs: average shape and redshift dependence \|Mao Wei-Ming Hu Chen et al. \| RAA \| 10-905 \| 2010 \| 2010RAA....10..905M \| http://ui.adsabs.harvard.edu/#abs/2010RAA....10..905M An XMM-Newton spectral survey of 12 mum selected galaxies - II. Implications for AGN selection and unification \|Brightman Murray Nandra Kirpal \| MNRAS \| 414-3084 \| 2011 \| 2011MNRAS.414.3084B \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.414.3084B CAIXA: a catalogue of AGN in the XMM-Newton archive. I. Spectral analysis \|Bianchi S. Guainazzi M. et al. \| A&A \| 495-421 \| 2009 \| 2009A&A...495..421B \| http://ui.adsabs.harvard.edu/#abs/2009A&A...495..421B A new technique to efficiently select Compton-thick AGN \|Severgnini P. Caccianiga A. \| A&A \| 542-46 \| 2012 \| 2012A&A...542A..46S \| http://ui.adsabs.harvard.edu/#abs/2012A&A...542A..46S 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 Detectability of low-energy X-ray spectral components in type 1 active galactic nuclei \|Scott A. E. Stewart G. C. \| MNRAS \| 423-2633 \| 2012 \| 2012MNRAS.423.2633S \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.423.2633S Variability and the X-ray/UV ratio of active galactic nuclei \|Vagnetti F. Turriziani S. et al. \| A&A \| 519-17 \| 2010 \| 2010A&A...519A..17V \| http://ui.adsabs.harvard.edu/#abs/2010A&A...519A..17V Disentangling AGN and Star Formation in Soft X-Rays \|LaMassa Stephanie M. Heckman T. M. \| ApJ \| 758-82 \| 2012 \| 2012ApJ...758...82L \| http://ui.adsabs.harvard.edu/#abs/2012ApJ...758...82L 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 The XMM-Newton serendipitous ultraviolet source survey catalogue \|Page M. J. Brindle C. et al. \| MNRAS \| 426-903 \| 2012 \| 2012MNRAS.426..903P \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.426..903P On the Iwasawa-Taniguchi effect of radio-quiet AGN \|Bianchi S. Guainazzi M. et al. \| A&A \| 467-19 \| 2007 \| 2007A&A...467L..19B \| http://ui.adsabs.harvard.edu/#abs/2007A&A...467L..19B Cross-correlation of the 2XMMi catalogue with Data Release 7 of the Sloan Digital Sky Survey \|Pineau F.-X. Motch C. et al. \| A&A \| 527-126 \| 2011 \| 2011A&A...527A.126P \| http://ui.adsabs.harvard.edu/#abs/2011A&A...527A.126P A systematic cross-search for radio/infrared counterparts of XMM- Newton sources \|Combi J. A. Albacete Colombo J. F. et al. \| Ap&SS \| 331-53 \| 2011 \| 2011Ap&SS.331...53C \| http://ui.adsabs.harvard.edu/#abs/2011Ap&SS.331...53C Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3 \|Ballo L. Heras F. J. H. et al. \| A&A \| 545-66 \| 2012 \| 2012A&A...545A..66B \| http://ui.adsabs.harvard.edu/#abs/2012A&A...545A..66B X-Ray Properties of the Northern Galactic Cap Sources in the 58 Month Swift/BAT Catalog \|Vasudevan Ranjan V. Brandt William N. et al. \| ApJ \| 763-111 \| 2013 \| 2013ApJ...763..111V \| http://ui.adsabs.harvard.edu/#abs/2013ApJ...763..111V High spectral resolution X-ray observations of AGN \|Kaastra J. S. \| AN \| 329-162 \| 2008 \| 2008AN....329..162K \| http://ui.adsabs.harvard.edu/#abs/2008AN....329..162K Searching for Compton-thick active galactic nuclei at z&tilde 0.1 \|Goulding A. D. Alexander D. M. et al. \| MNRAS \| 411-1231 \| 2011 \| 2011MNRAS.411.1231G \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.411.1231G The Fifth Data Release Sloan Digital Sky Survey/XMM-Newton Quasar Survey \|Young M. Elvis M. \| ApJS \| 183-17 \| 2009 \| 2009ApJS..183...17Y \| http://ui.adsabs.harvard.edu/#abs/2009ApJS..183...17Y Insight into Active Galactic Nucleus and Host Galaxy Co-evolution from Hard X-Ray Emission \|Wang J. Zhou X. L. \| ApJ \| 768-176 \| 2013 \| 2013ApJ...768..176W \| http://ui.adsabs.harvard.edu/#abs/2013ApJ...768..176W Activity of the Seyfert galaxy neighbours \|Koulouridis E. Plionis M. et al. \| A&A \| 552-135 \| 2013 \| 2013A&A...552A.135K \| http://ui.adsabs.harvard.edu/#abs/2013A&A...552A.135K A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys \|Brightman M. Silverman J. D. et al. \| MNRAS \| 433-2485 \| 2013 \| 2013MNRAS.433.2485B \| http://ui.adsabs.harvard.edu/#abs/2013MNRAS.433.2485B Are X-Ray Emitting Coronae around Supermassive Black Holes Outflowing? \|Liu Teng Wang Jun-Xian et al. \| ApJ \| 783-106 \| 2014 \| 2014ApJ...783..106L \| http://ui.adsabs.harvard.edu/#abs/2014ApJ...783..106L The 2XMMi/SDSS Galaxy Cluster Survey. III. Clusters associated with spectroscopically targeted luminous red galaxies in SDSS-DR10 \|Takey A. Schwope A. \| A&A \| 564-54 \| 2014 \| 2014A&A...564A..54T \| http://ui.adsabs.harvard.edu/#abs/2014A&A...564A..54T Synapses of active galactic nuclei:. Comparing X-ray and optical classifications using artificial neural networks \|Gonzalez-Martin O. Diaz-Gonzalez D. et al. \| A&A \| 567-92 \| 2014 \| 2014A&A...567A..92G \| http://ui.adsabs.harvard.edu/#abs/2014A&A...567A..92G 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 Link between the Hidden Broad Line Region and the Accretion Rate in Seyfert 2 Galaxies \|Marinucci Andrea Bianchi Stefano et al. \| ApJ \| 748-130 \| 2012 \| 2012ApJ...748..130M \| http://ui.adsabs.harvard.edu/#abs/2012ApJ...748..130M ERRATUM: The Fifth Data Release Sloan Digital Sky Survey/XMM-Newton Quasar Survey (2009 ApJS 183 17) \|Young M. Elvis M. \| ApJS \| 185-250 \| 2009 \| 2009ApJS..185..250Y \| http://ui.adsabs.harvard.edu/#abs/2009ApJS..185..250Y CAIXA: a catalogue of AGN in the XMM-Newton archive. II. Multiwavelength correlations \|Bianchi S. Bonilla N. 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Bregman Joel N. \| ApJ \| 829-9 \| 2016 \| 2016ApJ...829....9M \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...829....9M 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 A new sample of X-ray selected narrow emission-line galaxies. II. Looking for True Seyfert 2 \|Pons E. Watson M. G. \| A&A \| 594-72 \| 2016 \| 2016A&A...594A..72P \| http://ui.adsabs.harvard.edu/#abs/2016A&A...594A..72P A Catalog Sample of Low-mass Galaxies Observed in X-Rays with Central Candidate Black Holes \|Nucita A. A. 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Cappelluti N. et al. \| ApJ \| 858-110 \| 2018 \| 2018ApJ...858..110P \| http://ui.adsabs.harvard.edu/#abs/2018ApJ...858..110P Chandra Survey of Nearby Galaxies: Testing the Accretion Model for Low-luminosity AGNs \|She Rui Ho Luis C. et al. \| ApJ \| 859-152 \| 2018 \| 2018ApJ...859..152S \| http://ui.adsabs.harvard.edu/#abs/2018ApJ...859..152S 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 Evidence for radiation pressure compression in the X-ray narrow-line region of Seyfert galaxies \|Bianchi Stefano Guainazzi Matteo et al. \| MNRAS \| 485-416 \| 2019 \| 2019MNRAS.485..416B \| http://ui.adsabs.harvard.edu/#abs/2019MNRAS.485..416B A new clean catalogue of extragalactic non-nuclear X-ray sources in nearby galaxies \|Earnshaw H. P. Roberts T. 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Surcis G. et al. \| A&A \| 629-25 \| 2019 \| 2019A&A...629A..25C \| http://ui.adsabs.harvard.edu/#abs/2019A&A...629A..25C 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 Accretion History of AGNs. II. 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M. et al. \| ApJ \| 901-161 \| 2020 \| 2020ApJ...901..161K \| http://ui.adsabs.harvard.edu/#abs/2020ApJ...901..161K 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 A Luminous X-Ray Transient in SDSS J143359.16+400636.0: A Likely Tidal Disruption Event \|Brightman Murray Ward Charlotte et al. \| ApJ \| 909-102 \| 2021 \| 2021ApJ...909..102B \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...909..102B The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars \|Zhou Min-Hua Gu Min-Feng \| RAA \| 21-4 \| 2021 \| 2021RAA....21....4Z \| http://ui.adsabs.harvard.edu/#abs/2021RAA....21....4Z X-Ray spectra of AGNs with strong emission lines \|Tugay A. V. Vasylenko A. A. \| AstSR \| 8-160 \| 2012 \| 2012AstSR...8..160T \| http://ui.adsabs.harvard.edu/#abs/2012AstSR...8..160T A nearby galaxy perspective on dust evolution. Scaling relations and constraints on the dust build-up in galaxies with the DustPedia and DGS samples \|Galliano Fru00e9du00e9ric Nersesian Angelos et al. \| A&A \| 649-18 \| 2021 \| 2021A&A...649A..18G \| http://ui.adsabs.harvard.edu/#abs/2021A&A...649A..18G 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 impact of precession on the observed population of ULXs \|Khan Norman Middleton Matthew J. et al. \| MNRAS \| 509-2493 \| 2022 \| 2022MNRAS.509.2493K \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.509.2493K 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 AGN impact on the molecular gas in galactic centres as probed by CO lines \|Esposito Federico Vallini Livia et al. \| MNRAS \| 512-686 \| 2022 \| 2022MNRAS.512..686E \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.512..686E The Redshift Evolution of Ultraluminous X-Ray Sources out to z 0.5: Comparison with X-Ray Binary Populations and Contribution to the Cosmic X-Ray Background \|Scott Barrows R. Comerford Julia M. et al. \| ApJ \| 932-27 \| 2022 \| 2022ApJ...932...27S \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...932...27S X-ray emission from a rapidly accreting narrow-line Seyfert 1 galaxy at z = 6.56 \|Wolf J. Nandra K. et al. \| A&A \| 669-127 \| 2023 \| 2023A&A...669A.127W \| http://ui.adsabs.harvard.edu/#abs/2023A&A...669A.127W Dependency of optical/UV parameters on X-ray spectral index in AGNs \|Nour D. Sriram K. \| JHEAp \| 37-34 \| 2023 \| 2023JHEAp..37...34N \| http://ui.adsabs.harvard.edu/#abs/2023JHEAp..37...34N Investigating Model Dependencies for Obscured Active Galactic Nuclei: A Case Study of NGC 3982 \|Kallovu00e1 Kristu00edna Boorman Peter G. \| ApJ \| 966-116 \| 2024 \| 2024ApJ...966..116K \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...966..116K The XMM-Newton Line Emission Analysis Program (X-LEAP). I. 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Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2004-05-10T18:48:57Z/2005-01-07T04:37:14Z
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	2006-02-10T00:00:00Z
Last Update	2025-08-04
Keywords	"hold secrets undetectable", "local seyferts complement", "z sources", "obscured local sources", "XMM", "xray spectra", "absorbed sources", "nearby seyfert galaxy", "cfa sample", "luminosity function", "distant counterparts", "low z agn", "obscured agn", "test unification schemes", "xray census", "local sources", "hidden neighbours", "seyfert galaxy reveals", "xray regime"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr IAN GEORGE, 2006, 'COMPLETING THE X-RAY CENSUS OF NEARBY SEYFERT GALAXIES: OUR HIDDEN NEIGHBOURS', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-5gjea8o