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Paper: NGC 4051: Time variability in Chandra X-ray spectra
Volume: 290, Active Galactic Nuclei: from Central Engine to Host Galaxy
Page: 133
Authors: van der Meer, R. L. J.; Kaastra, J. S.; Steenbrugge, K. C.; Komossa, S.
Abstract: We present the analysis of the Chandra LETGS spectra of NGC 4051. The Narrow-line Seyfert 1 galaxy NGC 4051 has been intensively studied and is known to contain a warm absorber. The recent Chandra LETGS spectrum shows rapid variations with changes of a factor of 10 in flux. The long term variability is shown by comparing the spectrum with the HETGS spectrum taken a year earlier. From the HETGS spectrum a velocity component of -2340 km/s (blueshift) was found. The new LETGS spectrum does not show this component, but shows instead a new velocity component with almost double this speed. We draw conclusions on the dynamic constraints posed by these velocities and velocity changes.
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