A dataset provided by the European Space Agency

Name: Probing the Complex High-Energy Spectrum of NGC 4151
Published: 2004-08-22T00:00:00Z

Proposal ID	014350
Title	Probing the Complex High-Energy Spectrum of NGC 4151
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0143500101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0143500201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0143500301
DOI	https://doi.org/10.5270/esa-iu4k0hi
Principal Investigator, PI	Prof Robert Warwick
Abstract	Here we propose to monitor the bright Seyfert galaxy NGC 4151 with XMM-Newtonvia 6 observations, each of 20 ks, performed in successive satellite orbits andcoordinated with a deep INTEGRAL observation. We will investigate the detailedshape of the X-ray to Gamma-ray continuum in NGC 4151, study the nature of thecomplex absorber and look for correlated variability in the X-ray andultraviolet bands. The proposed programme will confront many unansweredquestions relating to the current AGN paradigm.
Publications	Clearing up the clouds around NGC 4151: evidence of a highly ionized absorber \|Piro, L., de Rosa, A., et al. \| A&A \| 441-13 \| 2005 \| 2005A&A...441L..13P \| http://ui.adsabs.harvard.edu/#abs/2005A&A...441L..13P 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 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 Relativistic iron K X-ray reverberation in NGC 4151 \|Zoghbi, A., Fabian, A. C., et al. \| MNRAS \| 422-129 \| 2012 \| 2012MNRAS.422..129Z \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.422..129Z 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 INTEGRAL complete sample of type 1 AGN \|Molina, M., Bassani, L., et al. \| MNRAS \| 399-1293 \| 2009 \| 2009MNRAS.399.1293M \| http://ui.adsabs.harvard.edu/#abs/2009MNRAS.399.1293M 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 Evidence for ultra-fast outflows in radio-quiet AGNs. I. Detection and statistical incidence of Fe K-shell absorption lines \|Tombesi, F., Cappi, M., et al. \| A&A \| 521-57 \| 2010 \| 2010A&A...521A..57T \| http://ui.adsabs.harvard.edu/#abs/2010A&A...521A..57T 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 On the apparent absence of broad iron lines in Seyfert galaxies \|Bhayani, S., Nandra, K., \| MNRAS \| 416-629 \| 2011 \| 2011MNRAS.416..629B \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.416..629B On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies \|Panessa, F., Bassani, L., et al. \| A&A \| 455-173 \| 2006 \| 2006A&A...455..173P \| http://ui.adsabs.harvard.edu/#abs/2006A&A...455..173P 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 An XMM-Newton survey of broad iron lines in AGN \|Nandra, K., O.Neill, P. M., et al. \| AN \| 327-1039 \| 2006 \| 2006AN....327.1039N \| http://ui.adsabs.harvard.edu/#abs/2006AN....327.1039N Root mean square variability properties of iron lines in Seyferts \|Bhayani, Shyam, Nandra, Kirpal, \| MNRAS \| 408-1020 \| 2010 \| 2010MNRAS.408.1020B \| http://ui.adsabs.harvard.edu/#abs/2010MNRAS.408.1020B Extreme flux states of NGC 4151 observed with INTEGRAL \|Lubinski, P., Zdziarski, A. A., et al. \| MNRAS \| 408-1851 \| 2010 \| 2010MNRAS.408.1851L \| http://ui.adsabs.harvard.edu/#abs/2010MNRAS.408.1851L 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 An XMM-Newton survey of broad iron lines in Seyfert galaxies \|Nandra, K., O.Neill, P. M., et al. \| MNRAS \| 382-194 \| 2007 \| 2007MNRAS.382..194N \| http://ui.adsabs.harvard.edu/#abs/2007MNRAS.382..194N 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 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 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 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 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 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 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 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 INTEGRAL High-energy Cut-off Distribution of Type 1 Active Galactic Nuclei \|Malizia, A., Molina, M., et al. \| ApJ \| 782-25 \| 2014 \| 2014ApJ...782L..25M \| http://ui.adsabs.harvard.edu/#abs/2014ApJ...782L..25M 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 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 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. N., \| Ap&SS \| 354-97 \| 2014 \| 2014Ap&SS.354...97Y \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y 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 Variability of the coronal line region in NGC 4151 \|Landt, Hermine, Ward, Martin J., et al. \| MNRAS \| 449-3795 \| 2015 \| 2015MNRAS.449.3795L \| http://ui.adsabs.harvard.edu/#abs/2015MNRAS.449.3795L 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 A comprehensive analysis of the hard X-ray spectra of bright Seyfert galaxies \|Lubinski, P., Beckmann, V., et al. \| MNRAS \| 458-2454 \| 2016 \| 2016MNRAS.458.2454L \| http://ui.adsabs.harvard.edu/#abs/2016MNRAS.458.2454L 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 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 A systematic study of the condensation of the corona and the application for Gamma 2-10 keV-Lbol/LEdd correlation in luminous active galactic nuclei \|Qiao, Erlin, Liu, B. F., \| MNRAS \| 477-210 \| 2018 \| 2018MNRAS.477..210Q \| http://ui.adsabs.harvard.edu/#abs/2018MNRAS.477..210Q The absence of a thin disc in M81* \|Young, A. J., McHardy, I., et al. \| MNRAS \| 476-5698 \| 2018 \| 2018MNRAS.476.5698Y \| http://ui.adsabs.harvard.edu/#abs/2018MNRAS.476.5698Y 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. 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 Revisiting the Spectral and Timing Properties of NGC 4151 \|Zoghbi, A., Miller, J. M., \| ApJ \| 884-26 \| 2019 \| 2019ApJ...884...26Z \| http://ui.adsabs.harvard.edu/#abs/2019ApJ...884...26Z 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. 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 Relativistic Reflection in NGC 4151 \|Szanecki, Micha\\u0142, Nied\\u017awiecki, Andrzej, \| ApJ \| 909-205 \| 2021 \| 2021ApJ...909..205S \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...909..205S 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, Fr\\u00e9d\\u00e9ric, 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 Are Compton-thin AGNs Globally Compton Thin? \|Tzanavaris, P., Yaqoob, T., et al. \| ApJ \| 922-85 \| 2021 \| 2021ApJ...922...85T \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...922...85T 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 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 timing and spectral analysis of reverberating active galactic nuclei \|Hancock, S., Young, A. J., \| MNRAS \| 514-5403 \| 2022 \| 2022MNRAS.514.5403H \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.514.5403H A Systematic Study of the Short-term X-Ray Variability of Seyfert Galaxies. I. Diversity of the X-Ray rms Spectra \|Hu, Jingwei, Jin, Chichuan, et al. \| ApJ \| 936-105 \| 2022 \| 2022ApJ...936..105H \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...936..105H Investigating scaling relations in X-ray reverberating AGN using symbolic regression \|Thongkonsing, P., Chainakun, P., et al. \| MNRAS \| 527-1950 \| 2024 \| 2024MNRAS.527.1950T \| http://ui.adsabs.harvard.edu/#abs/2024MNRAS.527.1950T 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2003-05-25T01:37:57Z/2003-05-27T20:32:41Z
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	2004-08-22T00:00:00Z
Keywords	"complex absorber", "ultraviolet bands", "deep integral", "NGC 4151", "XMM", "xmm newton via", "gamma ray continuum", "energy spectrum", "agn paradigm", "correlated variability", "XMM-Newton", "successive satellite orbits", "ngc 4151"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Robert Warwick, 2004, 'Probing the Complex High-Energy Spectrum of NGC 4151', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-iu4k0hi