NDLI: Optical and X-ray variability of Seyfert galaxies NGC 5548, NGC 7469, NGC 3227, NGC 4051, NGC 4151, Mrk 509, Mrk 79, and Akn 564 and quasar 1E 0754

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Optical and X-ray variability of Seyfert galaxies NGC 5548, NGC 7469, NGC 3227, NGC 4051, NGC 4151, Mrk 509, Mrk 79, and Akn 564 and quasar 1E 0754

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Optical and X-ray variability of Seyfert galaxies NGC 5548, NGC 7469, NGC 3227, NGC 4051, NGC 4151, Mrk 509, Mrk 79, and Akn 564 and quasar 1E 0754

Content Provider	Springer Nature Link
Author	Chesk, N. G. Sergeev, S. G. Vavilova, I. B.
Copyright Year	2009
Abstract	The results of a cross-correlation analysis of the optical and X-ray light curves for eight Seyfert galaxies, NGC 5548, NGC 7469, NGC 3227, NGC 4051, NGC 4151, Mrk 509, Mrk 79, and Akn 564 and for the optical spectra of the quasar 1E 0754 are presented. In the case of the galaxies NGC 5548 and NGC 7469, the maximum values of cross-correlation coefficients for optical and X-ray variations proved to be high (0.73 and 0.79, respectively). The lag time, determined from the maximum of cross-correlation function, is 2.800 −1.58 +3.12 days for NGC 5548 and 0.6 −4.3 +0.9 days for NGC 7469. This result favors downscattering of the X-ray emission into the optical range (direct Compton effect) for NGC 5548 and NGC 7469. In addition to the main maximum, which corresponds to the lag of the optical flux variations behind the X-ray flux, six objects (excluding Akn 564 and NGC 4151) show the wings in the intervals of cross-correlation functions that correspond to the time lags of X-ray emission behind the optical emission of approximately 10 days. A method of determining the masses of central black holes in AGNs through spectral line widths is presented; with this method the mass of the central black hole in the quasar 1E 0754 was found (M $_{BH}$ = 1.01 × 10$^{8}$ M $_{sun}$). The position of the quasar 1E 0754 in the mass-luminosity diagram meets the position of other NLS 1 galaxies.
Starting Page	107
Ending Page	113
Page Count	7
File Format	PDF
ISSN	08845913
Journal	Kinematics and Physics of Celestial Bodies
Volume Number	25
Issue Number	2
e-ISSN	19348401
Language	English
Publisher	Allerton Press, Inc.
Publisher Date	2009-05-06
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Multiwavelength campaign on Mrk 509 — IV. Optical-UV-X-ray variability and the nature of the soft X-ray excess

Twelve years of X-ray and optical variability in the Seyfert galaxy NGC 4051

X-ray spectral variability of the Seyfert galaxy NGC 4051

The rapid X-ray variability of NGC 4051

X-ray and optical variability of the seyfert galaxy NGC 7469

Long-term optical and X-ray variability of the Seyfert galaxy Markarian 79

Simultaneous EUV and X-ray variability of NGC 4051

Low-energy X-ray spectral variability of NGC 4051

Multiband optical surface brightness profile decompositions of the Seyfert galaxies Mrk 79 and NGC 5548

Optical and X-ray variability of Seyfert galaxies NGC 5548, NGC 7469, NGC 3227, NGC 4051, NGC 4151, Mrk 509, Mrk 79, and Akn 564 and quasar 1E 0754

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