A dataset provided by the European Space Agency

Name: Are there X-ray quiet quasars
Published: 2003-08-09T00:00:00Z

Proposal ID	010366
Title	Are there X-ray quiet quasars
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660301 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0103660401
DOI	https://doi.org/10.5270/esa-7ab43zm
Principal Investigator, PI	Dr Bernd Aschenbach
Abstract	GT-The X-ray-to-optical energy distribution of quasars, alpha_ox, is requiredto relate the quasar statistics, evolution and luminosity function in the twowavebands and to understand its. broad band emission. In a recent study ofradio-quiet quasars from ROSAT observations there is a small number of objectsshowing very weak X-ray emission compared to their optical luminosity. Thenature of these X-ray quiet quasars is unknown and it is not clear whether theyare the X-ray quiet extremes of a continous distribution or a distinct class ofobjects. XMM observations seem to be the only way to understand this newpopulation of quasars and to distinguish different explanations for the unknownphysical nature of these objects.
Publications	XMM-Newton observation of PG 0844+349 \|Brinkmann, W., Grupe, D., et al. \| A&A \| 398-81 \| 2003 \| 2003A&A...398...81B \| http://ui.adsabs.harvard.edu/#abs/2003A&A...398...81B Evidence of a high-velocity ionized outflow in a second narrow-line quasar PG 0844+349 \|Pounds, K. A., King, A. R., et al. \| MNRAS \| 346-1025 \| 2003 \| 2003MNRAS.346.1025P \| http://ui.adsabs.harvard.edu/#abs/2003MNRAS.346.1025P XMM-Newton observations of the two X-ray weak quasars PG 1411+442 and Mrk 304 \|Brinkmann, W., Papadakis, I. E., \| A&A \| 414-107 \| 2004 \| 2004A&A...414..107B \| http://ui.adsabs.harvard.edu/#abs/2004A&A...414..107B Exploring the X-ray sky with the XMM-Newton bright serendipitous survey \|Della Ceca, R., Maccacaro, T., et al. \| A&A \| 428-383 \| 2004 \| 2004A&A...428..383D \| http://ui.adsabs.harvard.edu/#abs/2004A&A...428..383D The XMM-Newton Needles in the Haystack Survey: the local X-ray luminosity function of normal. galaxies \|Georgantopoulos, I., Georgakakis, A., \| MNRAS \| 360-782 \| 2005 \| 2005MNRAS.360..782G \| http://ui.adsabs.harvard.edu/#abs/2005MNRAS.360..782G PG 0844+349 revisited - is there any outflow? \|Brinkmann, W., Wang, T., et al. \| A&A \| 450-925 \| 2006 \| 2006A&A...450..925B \| http://ui.adsabs.harvard.edu/#abs/2006A&A...450..925B X-QUEST: A Comprehensive X-ray Study of Local ULIRGS and QSOs \|Teng, Stacy H., Veilleux, Sylvain, \| ApJ \| 725-1848 \| 2010 \| 2010ApJ...725.1848T \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...725.1848T High-precision multi-band measurements of the angular clustering of X-ray sources \|Ebrero, J., Mateos, S., et al. \| A&A \| 500-749 \| 2009 \| 2009A&A...500..749E \| http://ui.adsabs.harvard.edu/#abs/2009A&A...500..749E 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 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 Average Fe Kalpha emission from distant AGN \|Corral, A., Page, M. J., et al. \| A&A \| 492-71 \| 2008 \| 2008A&A...492...71C \| http://ui.adsabs.harvard.edu/#abs/2008A&A...492...71C Studying the X-ray/UV Variability of Active Galactic Nuclei with data from Swift and XMM archives \|Turriziani, Sara, \| JPhCS \| 280-12005 \| 2011 \| 2011JPhCS.280a2005T \| http://ui.adsabs.harvard.edu/#abs/2011JPhCS.280a2005T 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 X-ray absorption in distant type II QSOs \|Krumpe, M., Lamer, G., et al. \| A&A \| 483-415 \| 2008 \| 2008A&A...483..415K \| http://ui.adsabs.harvard.edu/#abs/2008A&A...483..415K The x-ray luminous galaxy cluster population at 0.9 < z &lsim; 1.6 as revealed by the XMM-Newton Distant Cluster Project \|Fassbender, R., Bohringer, H., et al. \| NJPh \| 13-125014 \| 2011 \| 2011NJPh...13l5014F \| http://ui.adsabs.harvard.edu/#abs/2011NJPh...13l5014F Warm-hot intergalactic medium contribution to baryonic matter \|Soltan, A. M., \| A&A \| 460-59 \| 2006 \| 2006A&A...460...59S \| http://ui.adsabs.harvard.edu/#abs/2006A&A...460...59S 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 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 Evidence for a multizone warm absorber in the XMM-Newton spectrum of Markarian 304 \|Piconcelli, E., Jimenez-Bailon, E., et al. \| MNRAS \| 351-161 \| 2004 \| 2004MNRAS.351..161P \| http://ui.adsabs.harvard.edu/#abs/2004MNRAS.351..161P The Serendipitous XMM-Newton Cluster Athens Survey (SEXCLAS): sample selection and the cluster logN-logS \|Kolokotronis, V., Georgakakis, A., et al. \| MNRAS \| 366-163 \| 2006 \| 2006MNRAS.366..163K \| http://ui.adsabs.harvard.edu/#abs/2006MNRAS.366..163K Multiwavelength XMM-Newton observations of the Laor et al. sample of PG quasars \|Brocksopp, C., Starling, R. L. C., et al. \| MNRAS \| 366-953 \| 2006 \| 2006MNRAS.366..953B \| http://ui.adsabs.harvard.edu/#abs/2006MNRAS.366..953B The XMM-Newton view of PG quasars. I. X-ray continuum and absorption \|Piconcelli, E., Jimenez-Bailon, E., et al. \| A&A \| 432-15 \| 2005 \| 2005A&A...432...15P \| http://ui.adsabs.harvard.edu/#abs/2005A&A...432...15P The XMM-Newton view of PG quasars. II. Properties of the Fe K_alpha line \|Jimenez-Bailon, E., Piconcelli, E., et al. \| A&A \| 435-449 \| 2005 \| 2005A&A...435..449J \| http://ui.adsabs.harvard.edu/#abs/2005A&A...435..449J The XMM-Newton serendipitous survey. III. The AXIS X-ray source counts and angular clustering \|Carrera, F. J., Ebrero, J., et al. \| A&A \| 469-27 \| 2007 \| 2007A&A...469...27C \| http://ui.adsabs.harvard.edu/#abs/2007A&A...469...27C High precision X-ray log N - log S distributions: implications for the obscured AGN population \|Mateos, S., Warwick, R. S., et al. \| A&A \| 492-51 \| 2008 \| 2008A&A...492...51M \| http://ui.adsabs.harvard.edu/#abs/2008A&A...492...51M Narrow Iron Kalpha Lines in Active Galactic Nuclei: Evolving Populations? \|Zhou, Xin-Lin, Wang, Jian-Min, \| ApJ \| 618-83 \| 2005 \| 2005ApJ...618L..83Z \| http://ui.adsabs.harvard.edu/#abs/2005ApJ...618L..83Z Fe K Line Profile in Low-Redshift Quasars: Average Shape and Eddington Ratio Dependence \|Inoue, Hirohiko, Terashima, Yuichi, \| ApJ \| 662-860 \| 2007 \| 2007ApJ...662..860I \| http://ui.adsabs.harvard.edu/#abs/2007ApJ...662..860I 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 The XMM-Newton serendipitous survey. VI. The X-ray luminosity function \|Ebrero, J., Carrera, F. J., et al. \| A&A \| 493-55 \| 2009 \| 2009A&A...493...55E \| http://ui.adsabs.harvard.edu/#abs/2009A&A...493...55E 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 Breaking the sigma8-Omega m Degeneracy Using the Clustering of High-z X-ray Active Galactic Nuclei \|Basilakos, Spyros, Plionis, Manolis, \| ApJ \| 714-185 \| 2010 \| 2010ApJ...714L.185B \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...714L.185B The quasar PG 0844+349 in an X-ray weak state \|Gallo, L. C., Grupe, D., et al. \| MNRAS \| 412-161 \| 2011 \| 2011MNRAS.412..161G \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.412..161G A serendipitous XMM survey of the SDSS: the evolution of the colour-magnitude diagram of X-ray AGN from z= 0.8 to 0.1 \|Georgakakis, Antonis, Nandra, K., \| MNRAS \| 414-992 \| 2011 \| 2011MNRAS.414..992G \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.414..992G 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 absorption origin for the soft excess in Seyfert 1 active galactic nuclei \|Middleton, Matthew, Done, Chris, \| MNRAS \| 381-1426 \| 2007 \| 2007MNRAS.381.1426M \| http://ui.adsabs.harvard.edu/#abs/2007MNRAS.381.1426M Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample \|Vasudevan, R. V., Fabian, A. C., \| MNRAS \| 392-1124 \| 2009 \| 2009MNRAS.392.1124V \| http://ui.adsabs.harvard.edu/#abs/2009MNRAS.392.1124V An explanation for the soft X-ray excess in active galactic nuclei \|Crummy, J., Fabian, A. C., et al. \| MNRAS \| 365-1067 \| 2006 \| 2006MNRAS.365.1067C \| http://ui.adsabs.harvard.edu/#abs/2006MNRAS.365.1067C Testing a Scale-independent Method to Measure the Mass of Black Holes \|Gliozzi, M., Titarchuk, L., et al. \| ApJ \| 735-16 \| 2011 \| 2011ApJ...735...16G \| http://ui.adsabs.harvard.edu/#abs/2011ApJ...735...16G Is the soft excess in active galactic nuclei real? \|Gierlinski, Marek, Done, Chris, \| MNRAS \| 349-7 \| 2004 \| 2004MNRAS.349L...7G \| http://ui.adsabs.harvard.edu/#abs/2004MNRAS.349L...7G Mining for normal galaxies in the first XMM-Newton Serendipitous Source Catalog \|Georgakakis, A. E., Chavushyan, V., et al. \| MNRAS \| 367-1017 \| 2006 \| 2006MNRAS.367.1017G \| http://ui.adsabs.harvard.edu/#abs/2006MNRAS.367.1017G 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 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 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 The cosmological analysis of X-ray cluster surveys - II. 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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 Ensemble X-ray variability of active galactic nuclei from serendipitous source catalogues \|Vagnetti, F., Turriziani, S., \| A&A \| 536-84 \| 2011 \| 2011A&A...536A..84V \| http://ui.adsabs.harvard.edu/#abs/2011A&A...536A..84V 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 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. 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J., et al. \| AN \| 324-44 \| 2003 \| 2003AN....324...44B \| http://ui.adsabs.harvard.edu/#abs/2003AN....324...44B X-ray spectra of XMM-Newton AXIS serendipitous sources \|Mateos, S., Barcons, X., et al. \| AN \| 324-48 \| 2003 \| 2003AN....324...48M \| http://ui.adsabs.harvard.edu/#abs/2003AN....324...48M 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 virgul 2.3 \|Ballo, L., Heras, F. J. 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S., \| AN \| 329-162 \| 2008 \| 2008AN....329..162K \| http://ui.adsabs.harvard.edu/#abs/2008AN....329..162K A Comparison of Hard X-ray Photon Indices and Iron Kalpha Emission Lines in X-ray Luminous Narrow- and Broad-line Seyfert 1 Galaxies \|Zhou, Xin-Lin, Zhang, Shuang-Nan, \| ApJ \| 713-11 \| 2010 \| 2010ApJ...713L..11Z \| http://ui.adsabs.harvard.edu/#abs/2010ApJ...713L..11Z 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 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 Uncovering obscured luminous AGN with WISE \|Mateos, S., Alonso-Herrero, A., et al. \| MNRAS \| 434-941 \| 2013 \| 2013MNRAS.434..941M \| http://ui.adsabs.harvard.edu/#abs/2013MNRAS.434..941M 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 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 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 The narrow Fe Kalpha line and the molecular torus in active galactic nuclei: an IR/X-ray view \|Ricci, C., Ueda, Y., et al. \| A&A \| 567-142 \| 2014 \| 2014A&A...567A.142R \| http://ui.adsabs.harvard.edu/#abs/2014A&A...567A.142R 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 Multiwavelength campaign on Mrk 509. XIII. Testing ionized-reflection models on Mrk 509 \|Boissay, R., Paltani, S., et al. \| A&A \| 567-44 \| 2014 \| 2014A&A...567A..44B \| http://ui.adsabs.harvard.edu/#abs/2014A&A...567A..44B Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift \|Yershov, V. 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F., et al. \| A&A \| 501-915 \| 2009 \| 2009A&A...501..915B \| http://ui.adsabs.harvard.edu/#abs/2009A&A...501..915B The relationship between O IIIlambda5007 A equivalent width and obscuration in active galactic nuclei \|Caccianiga, A., Severgnini, P., \| MNRAS \| 415-1928 \| 2011 \| 2011MNRAS.415.1928C \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.415.1928C Sunyaev-Zel.dovich 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 Do the spectral energy distributions of type 1 active galactic nuclei show diversity? \|Scott, A. E., Stewart, G. C., \| MNRAS \| 438-2253 \| 2014 \| 2014MNRAS.438.2253S \| http://ui.adsabs.harvard.edu/#abs/2014MNRAS.438.2253S 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 Swift follow-up of IceCube triggers, and implications for the Advanced-LIGO era \|Evans, P. A., Osborne, J. P., et al. \| MNRAS \| 448-2210 \| 2015 \| 2015MNRAS.448.2210E \| http://ui.adsabs.harvard.edu/#abs/2015MNRAS.448.2210E XMM-Newton publication statistics \|Ness, J.-U., Parmar, A. N., et al. \| AN \| 335-210 \| 2014 \| 2014AN....335..210N \| http://ui.adsabs.harvard.edu/#abs/2014AN....335..210N The Tight Relation between X-Ray and Ultraviolet Luminosity of Quasars \|Lusso, E., Risaliti, G., \| ApJ \| 819-154 \| 2016 \| 2016ApJ...819..154L \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...819..154L Unveiling the X-ray/UV properties of disk winds in active galactic nuclei using broad and mini-broad absorption line quasars \|Giustini, M., \| AN \| 337-459 \| 2016 \| 2016AN....337..459G \| http://ui.adsabs.harvard.edu/#abs/2016AN....337..459G 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 Interaction of the Fermi Bubbles with the Milky Way.s 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 The XMM Cluster Survey: the halo occupation number of BOSS galaxies in X-ray clusters \|Mehrtens, Nicola, Romer, A. 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Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2000-11-04T23:35:48Z/2002-07-10T15:55:52Z
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	2003-08-09T00:00:00Z
Keywords	"optical luminosity", "quasar statistics", "continous distribution", "XMM", "radio quiet quasars", "distinct class", "weak xray emission", "luminosity function", "xray quiet quasars", "optical energy distribution", "ROSAT", "broad band emission", "xray quiet extremes"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Bernd Aschenbach, 2003, 'Are there X-ray quiet quasars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-7ab43zm