Simultaneous Millimetre-wave and X-ray monitoring of the Seyfert galaxy NGC 7469
نویسندگان
چکیده
منابع مشابه
Frequency - dependent time lags in the X - ray emission of the Seyfert galaxy NGC 7469
We report the discovery of time lags in the cross-spectra of the X-ray light curves of the Seyfert galaxy NGC 7469. This behavior is common in Galactic black hole and neutron star binaries, and is in the sense that harder X-rays are delayed with respect to the soft with a time lag approximately proportional to the Fourier period. At the longest period probed by our observation (∼ 6 days) we fin...
متن کاملSimultaneous Ultraviolet and X-ray Observations of the Seyfert Galaxy NGC 4151. I. Physical Conditions in the X-ray Absorbers
We present a detailed analysis of the intrinsic X-ray absorption in the Seyfert 1 galaxy NGC 4151 using Chandra/High Energy Transmission Grating Spectrometer data obtained 2002 May as part of a program which included simultaneous ultraviolet (UV) spectra using the Hubble Space Telescope/Space Telescope Imaging Spectrograph and the Far Ultraviolet Spectrographic Explorer. Previous studies, most ...
متن کاملSimultaneous Ultraviolet and X-ray Observations of Seyfert Galaxy Ngc 4151. I. Physical Conditions in the X-ray Absorbers
We present a detailed analysis of the intrinsic X-ray absorption in the Seyfert 1 galaxy NGC 4151 usingChandraHigh Energy Transmission Grating Spectrometer data obtained in 2002 May as part of a program that included simultaneous ultraviolet (UV) spectra using theHubble Space TelescopeSpaceTelescope ImagingSpectrograph and theFarUltraviolet Spectrographic Explorer. Previous studies, most recent...
متن کاملTemporal characteristics of the X - ray emission of NGC 7469
We present a study of the time variability of NGC 7469, based on a ∼ 30 d RXTE/PCA observation. Variability is seen across the X-ray band, and spectral changes are observed. The softness ratio is correlated with the ultraviolet flux, but appears to show more rapid variability. The RMS variability parameter calculated on ∼ 1d time scales is significantly variable, and sharp increases are seen cl...
متن کاملModeling the X - ray – UV Correlations in NGC 7469
We model the correlated X-ray – UV observations of NGC 7469, for which well sampled data in both these bands have been obtained recently in a multiwavelength monitoring campaign. To this end we derive the transfer function in wavelength λ and time lag τ , for reprocessing hard (X-ray) photons from a point source to softer ones (UV-optical) by an infinite plane (representing a cool, thin accreti...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2019
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stz3273