Searching for correlations in simultaneous X-ray and UV emission in the narrow-line Seyfert 1 galaxy 1H 0707–495

We examine simultaneous X-ray and UV light curves from multi-epoch 8 d XMM–Newton observations of the narrow line Seyfert 1 galaxy 1H 0707–495. The simultaneous observations reveal that both X-ray and UV emission are variable and that the amplitude of the X-ray variations is significantly greater th...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society Vol. 453; no. 4; pp. 3455 - 3460
Main Authors: Robertson, D. R. S., Gallo, L. C., Zoghbi, A., Fabian, A. C.
Format: Journal Article
Language:English
Published: London Oxford University Press 11.11.2015
Subjects:
Bands
Black holes
Confidence
Confidence intervals
Correlation
Correlation analysis
Emission
Seyfert galaxies
Stars & galaxies
Ultraviolet radiation
X-ray astronomy
X-rays
XMM (spacecraft)
galaxies: individual: 1H 0707–495
galaxies: Seyfert
galaxies: active
X-rays: galaxies
X-rays: individual: 1H 0707–495
ISSN:0035-8711, 1365-2966
Online Access:Get full text
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Summary:We examine simultaneous X-ray and UV light curves from multi-epoch 8 d XMM–Newton observations of the narrow line Seyfert 1 galaxy 1H 0707–495. The simultaneous observations reveal that both X-ray and UV emission are variable and that the amplitude of the X-ray variations is significantly greater than that of the UV variations in both epochs. Using a discrete correlation function the X-ray and UV light curves were examined for correlation on time-scales up to 7 d. Low-significance (∼95 per cent confidence) correlations with the UV leading the X-ray variations are observed. The lack of a significant correlation between the UV and X-ray bands seems consistent with the X-ray source being centrally compact and dominated by light bending close to the black hole. In addition, multiband X-ray light curves were examined for correlations on similar time-scales. Highly significant (>99.9 per cent confidence) correlations were observed at zero lag consistent with previous studies of this active galactic nucleus.
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ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stv1575