A dataset provided by the European Space Agency

Name: Testing Accretion Disc Theory: X-ray - UVW1 Lag Measurement in NGC 4593
Published: 2017-08-02T22:00:00Z

Proposal ID	078474
Title	Testing Accretion Disc Theory: X-ray - UVW1 Lag Measurement in NGC 4593
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0784740101
DOI	https://doi.org/10.5270/esa-m63x5og
Principal Investigator, PI	Prof Ian McHardy
Abstract	Recent Swift UV/optical lag measurements show that UV/optical variability inNGC5548 comes from reprocessing of X-rays by the accretion disc. However theimplied disc size is 3x larger than predicted by standard Shakura-Sunyaevtheory. Before speculating about the discrepancy we should measure high S/N lagsin AGN with different disc parameters. A very large Swift campaign has beenproposed for NGC4593, mass 7x lower than NGC5548, with guaranteed continuousKepler, daily HST and 3x daily griz monitoring. Swift will measure UV-opticallags easily but struggles to measure the estimated 20ks X-ray/UV lag. Thistimescale is, however, perfectly suited to XMM, as our recent PN/OM fast modeobservations of NGC4395 show. Here we propose a 130ks observation to measure the crucial X-ray/UVW1 lag.
Publications	On the Observational Difference between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei \|Liu, Hezhen, Luo, B., et al. \| ApJ \| 910-103 \| 2021 \| 2021ApJ...910..103L \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...910..103L 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 Thermal Reprocessing of Reflected Radiation in the AGN Accretion Disk \|Zhong, Xiaogu, Wang, Jiancheng, \| ApJ \| 912-113 \| 2021 \| 2021ApJ...912..113Z \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...912..113Z Nitrogen X-ray absorption in the local ISM \|Gatuzz, Efrain, Garc\\u00eda, Javier A., \| MNRAS \| 504-4460 \| 2021 \| 2021MNRAS.504.4460G \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.504.4460G 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 Time-scale-dependent X-ray to UV time lags of NGC 4593 using high-intensity XMM-Newton observations with Swift and AstroSat \|Beard, Max W. J., McHardy, Ian M., et al. \| MNRAS \| 519-91 \| 2023 \| 2023MNRAS.519...91B \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.519...91B 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	RGS1, EPN, RGS2, EMOS1, OM, EMOS2
Temporal Coverage	2016-07-14T19:08:29Z/2016-07-16T10:36:49Z
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	2017-08-02T22:00:00Z
Keywords	"mass 7x lower", "uvw1 lag", "optical lag measurements", "om fast mode", "uv lag", "daily hst", "accretion disc", "3x daily griz", "swift campaign", "disc parameters", "NGC 4593", "XMM", "ngc 4593", "optical variability", "guaranteed continuous kepler", "3x larger", "perfectly suited", "swift uv", "implied disc size", "ngc5548 comes", "HST"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Ian McHardy, 2017, 'Testing Accretion Disc Theory: X-ray - UVW1 Lag Measurement in NGC 4593', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-m63x5og