Complex UV/X-ray variability of 1H~0707-495
arXiv:1708.08664 · doi:10.1093/mnras/stx2163
Abstract
We study the relationship between the UV and X-ray variability of the narrow-line Seyfert 1 galaxy 1H~0707-495. Using a year long {\it Swift} monitoring and four long {\it XMM-Newton} observations, we perform cross-correlation analyses of the UV and X-ray light curves, on both long and short time scales. We also perform time-resolved X-ray spectroscopy on 1-2 ks scale, and study the relationship between the UV emission and the X-ray spectral components - soft X-ray excess and a power-law. We find that the UV and X-ray variations anti-correlate on short, and possibly on long time scales as well. Our results rule out reprocessing as the dominant mechanism for the UV variability, as well as the inward propagating fluctuations in the accretion rate. Absence of a positive correlation between the photon index and the UV flux suggests that the observed UV emission is unlikely to be the seed photons for the thermal Comptonisation. We find a strong correlation between the continuum flux and the soft-excess temperature which implies that the soft excess is most likely the reprocessed X-ray emission in the inner accretion disc. Strong X-ray heating of the innermost regions in the disc, due to gravitational light bending, appears to be an important effect in 1H~0707-495, giving rise to a significant fraction of the soft excess as reprocessed thermal emission. We also find indications for a non-static, dynamic X-ray corona, where either the size or height (or both) vary with time.
arXiv comment10 pages, 7 figures, Accepted to MNRAS
References in corpus (37)
- The Swift X-ray Telescope
- The Swift Ultra-Violet/Optical Telescope
- The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
- On characterising the variability properties of X-ray light curves from active galaxies
- The XMM-Newton Optical/UV Monitor Telescope
- Intrinsic disc emission and the Soft X-ray Excess in AGN
- On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
- Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
- Extreme X-ray spectral variability in the Seyfert 2 Galaxy NGC 1365
- A Comprehensive Spectral and Variability Study of Narrow-Line Seyfert 1 Galaxies Observed by ASCA: I. Observations and Time Series Analysis
- Understanding X-ray reflection emissivity profiles in AGN: Locating the X-ray source
- On X-ray Variability in Seyfert Galaxies
- Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability
- The long term X-ray spectral variability of AGN
- How the X-ray spectrum of a Narrow-Line Seyfert 1 galaxy may be reflection dominated
- Multiwavelength campaign on Mrk 509 XII. Broad band spectral analysis
- 1H0707-495 in 2011: An X-ray source within a gravitational radius of the event horizon
- XMM-Newton discovery of a sharp spectral feature at ~7 keV in the Narrow-Line Seyfert 1 galaxy 1H 0707-495
- Determination of the X-ray reflection emissivity profile of 1H 0707-495
- New constraints on the continuum-emission mechanism of AGN: Intensive monitoring of NGC 7469 in the X-ray and ultraviolet
- Spectral Analysis of 1H0707-495 with XMM-Newton
- The Closest Look at 1H0707-495: X-ray Reverberation Lags with 1.3 Ms of Data
- The INTEGRAL high energy cut-off distribution of type 1 AGN
- The Effects of Disc Winds on the Spectrum and Black Hole Growth Rate of Active Galactic Nuclei
- A comprehensive analysis of the hard X-ray spectra of bright Seyfert galaxies
- An investigation of the origin of soft X-ray excess emission from Narrow-line Seyfert 1 galaxies Akn564 and Mrk1044
- Ultraviolet and X-ray variability of active galactic nuclei with Swift
- Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. III. Optical Observations and the Optical--UV--X-ray Connection
- Detection of a possible X-ray Quasi-periodic Oscillation in the Active Galactic Nucleus 1H~0707-495
- A remarkable long-term light curve, and deep, low-state spectroscopy: Swift & XMM-Newton monitoring of the NLS1 galaxy Mkn 335
- The broad-band spectrum of 3C 120 observed by BeppoSAX
- A Comprehensive X-ray Spectral Analysis of the Seyfert 1.5 NGC 3227
- Searching for Correlations in Simultaneous X-ray and UV Emission in the Narrow-line Seyfert 1 galaxy 1H 0707-495
- Theoretical modelling of the AGN iron-line vs continuum time-lags in the lamp-post geometry
- X-ray to UV Variability Correlation in MCG-6-30-15
- Long-term monitoring of PKS0558-504 with Swift: the disc-corona link
- A 12-day ASCA Observation of the Narrow-Line Seyfert 1 Galaxy Ton S180: Time-Selected Spectroscopy
Cited by in corpus (8)
- UV/optical disk thermal reverberation in AGN: an in-depth study with an analytic prescription for the time-lag spectra
- Extreme ultra-soft X-ray variability in an eROSITA observation of the Narrow-Line Seyfert 1 Galaxy 1H 0707-495
- Modelling correlated variability in accreting black holes: the effect of high density and variable ionisation on reverberation lags
- UV to X-ray Comptonization delay in Mrk 493
- A Search for X-ray/UV Correlation in the Reflection-Dominated Seyfert 1 Galaxy Mrk 1044
- XMM-Newton observation of V1504 Cyg as a probe for the existence of an evaporated corona
- Searching for similarities in the accretion flow of Seyfert 1 galaxies and cataclysmic variables based on flare profiles of IRAS 13224-3809, 1H 0707-495, Mrk 766 and MV Lyr
- Wind-luminosity evolution in NLS1 AGN 1H 0707-495