A dataset provided by the European Space Agency

Name: Multi-Epoch XMM-EPIC Observations of the Active Nucleus in NGC4258
Published: 2003-06-15T00:00:00Z

Proposal ID	005914
Title	Multi-Epoch XMM-EPIC Observations of the Active Nucleus in NGC4258
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140401 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140901
DOI	https://doi.org/10.5270/esa-hw7zthc
Principal Investigator, PI	Dr Lincoln J. Greenhill
Abstract	We will search for hard (>2 keV) X-ray spectral variability in the NGC4258active nucleus with eight, 10-ksec XMM-EPIC observations spaced over the twoyears covered by AO-1. NGC4258 is noteworthy for its remarkable nuclearmegamaser. VLBI imaging of the maser has provided the first direct images of anAGN on sub-parsec scales and has yielded uniquely precise estimates for a numberof important and normally inaccessible quantities, such as the AGN central mass and the accretion disk orientation. We will use variability in the X-rayspectrum to explore the three-dimensional geometry of the NGC4258 accretiondisk, to determine whether the central engine is obscured by a thin, warped diskas opposed to a thick torus, and to provide tighter constraints on the Fe k line
Publications	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 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 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 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 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 Identifying XMM-Newton observations affected by solar wind charge exchange. Part I \|Carter, J. A., Sembay, S., \| A&A \| 489-837 \| 2008 \| 2008A&A...489..837C \| http://ui.adsabs.harvard.edu/#abs/2008A&A...489..837C X-Ray Luminosity and Absorption Column Fluctuations in the H2O Maser Galaxy NGC 4258 from Weeks to Years \|Fruscione, Antonella, Greenhill, Lincoln J., et al. \| ApJ \| 624-103 \| 2005 \| 2005ApJ...624..103F \| http://ui.adsabs.harvard.edu/#abs/2005ApJ...624..103F XMM-Newton Archival Study of the Ultraluminous X-Ray Population in Nearby Galaxies \|Winter, Lisa M., Mushotzky, Richard F., \| ApJ \| 649-730 \| 2006 \| 2006ApJ...649..730W \| http://ui.adsabs.harvard.edu/#abs/2006ApJ...649..730W Spatially Resolved X-Ray Spectra of NGC 4258 \|Yang, Y., Li, B., et al. \| ApJ \| 660-1106 \| 2007 \| 2007ApJ...660.1106Y \| http://ui.adsabs.harvard.edu/#abs/2007ApJ...660.1106Y Ultra-luminous sources in nearby galaxies \|Mushotzky, Richard, \| AdSpR \| 38-2793 \| 2006 \| 2006AdSpR..38.2793M \| http://ui.adsabs.harvard.edu/#abs/2006AdSpR..38.2793M An XMM-Newton Survey of the Soft X-ray Background. I. The O VII and O VIII Lines Between l = 120 and l = 240 \|Henley, David B., Shelton, Robin L., \| ApJS \| 187-388 \| 2010 \| 2010ApJS..187..388H \| http://ui.adsabs.harvard.edu/#abs/2010ApJS..187..388H 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 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 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 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. 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 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 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 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. H., et al. \| A&A \| 545-66 \| 2012 \| 2012A&A...545A..66B \| http://ui.adsabs.harvard.edu/#abs/2012A&A...545A..66B The 2-8 keV cosmic X-ray background spectrum as observed with XMM-Newton \|De Luca, A., Molendi, S., \| A&A \| 419-837 \| 2004 \| 2004A&A...419..837D \| http://ui.adsabs.harvard.edu/#abs/2004A&A...419..837D 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 XMM-Newton Observations of Luminous Sources in Nearby Galaxies NGC 4395, NGC 4736, and NGC 4258 \|Akyuz, A., Kayaci, S., et al. \| AJ \| 145-67 \| 2013 \| 2013AJ....145...67A \| http://ui.adsabs.harvard.edu/#abs/2013AJ....145...67A 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 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 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 Obscuration-dependent Evolution of Active Galactic Nuclei \|Buchner, Johannes, Georgakakis, Antonis, et al. \| ApJ \| 802-89 \| 2015 \| 2015ApJ...802...89B \| http://ui.adsabs.harvard.edu/#abs/2015ApJ...802...89B A correlation between the spectral and timing properties of AGN \|Papadakis, I. E., Sobolewska, M., et al. \| A&A \| 494-905 \| 2009 \| 2009A&A...494..905P \| http://ui.adsabs.harvard.edu/#abs/2009A&A...494..905P 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 Non-detection of X-ray emission from sterile neutrinos in stacked galaxy spectra \|Anderson, Michael E., Churazov, Eugene, \| MNRAS \| 452-3905 \| 2015 \| 2015MNRAS.452.3905A \| http://ui.adsabs.harvard.edu/#abs/2015MNRAS.452.3905A 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 X-ray Spectral and Optical Properties of a ULX in NGC 4258 (M106) \|Avdan, H., Avdan, S., et al. \| ApJ \| 828-105 \| 2016 \| 2016ApJ...828..105A \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...828..105A 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 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 Searching for propeller-phase ULXs in the XMM-Newton Serendipitous Source Catalogue \|Earnshaw, H. P., Roberts, T. P., \| MNRAS \| 476-4272 \| 2018 \| 2018MNRAS.476.4272E \| http://ui.adsabs.harvard.edu/#abs/2018MNRAS.476.4272E Imaging Plasma Density Structures in the Soft X-Rays Generated by Solar Wind Charge Exchange with Neutrals \|Sibeck, David G., Allen, R., et al. \| SSRv \| 214-79 \| 2018 \| 2018SSRv..214...79S \| http://ui.adsabs.harvard.edu/#abs/2018SSRv..214...79S 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 A systematic search for near-infrared counterparts of nearby ultraluminous X-ray sources (II) \|Lopez, K. M., Heida, M., et al. \| MNRAS \| 469-671 \| 2017 \| 2017MNRAS.469..671L \| http://ui.adsabs.harvard.edu/#abs/2017MNRAS.469..671L The Spectrum of the Universe \|Hill, Ryley, Masui, Kiyoshi W., \| ApSpe \| 72-663 \| 2018 \| 2018ApSpe..72..663H \| http://ui.adsabs.harvard.edu/#abs/2018ApSpe..72..663H 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. P., et al. \| MNRAS \| 483-5554 \| 2019 \| 2019MNRAS.483.5554E \| http://ui.adsabs.harvard.edu/#abs/2019MNRAS.483.5554E 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 Accretion History of AGNs. II. Constraints on AGN Spectral Parameters Using the Cosmic X-Ray Background \|Ananna, Tonima Tasnim, Treister, Ezequiel, et al. \| ApJ \| 889-17 \| 2020 \| 2020ApJ...889...17A \| http://ui.adsabs.harvard.edu/#abs/2020ApJ...889...17A The Variable and Non-variable X-Ray Absorbers in Compton-thin Type II Active Galactic Nuclei \|Laha, Sibasish, Markowitz, Alex G., et al. \| ApJ \| 897-66 \| 2020 \| 2020ApJ...897...66L \| http://ui.adsabs.harvard.edu/#abs/2020ApJ...897...66L 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 The ULX source X-3 in NGC 4258: a search for its X-ray and optical properties \|Akyuz, A., Avdan, S., et al. \| MNRAS \| 499-2138 \| 2020 \| 2020MNRAS.499.2138A \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.499.2138A 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 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 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 Comprehensive X-ray view of the active nucleus in NGC 4258 \|Masini, A., Wijesekera, J. V., et al. \| A&A \| 663-87 \| 2022 \| 2022A&A...663A..87M \| http://ui.adsabs.harvard.edu/#abs/2022A&A...663A..87M 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 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2001-05-06T18:50:18Z/2002-05-23T02:04:01Z
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	2003-06-15T00:00:00Z
Keywords	"accretion disk orientation", "central engine", "nuclear megamaser", "vlbi imaging", "inaccessible quantities", "XMM", "xray spectrum", "agn central mass", "ngc4258 active nucleus", "thick torus", "EPIC", "dimensional geometry", "sub parsec scales", "active nucleus", "xmm epic", "tighter constraints", "NGC4258", "warped disk", "ngc4258 accretion disk"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Lincoln J. Greenhill, 2003, 'Multi-Epoch XMM-EPIC Observations of the Active Nucleus in NGC4258', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-hw7zthc