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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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