Rapidly variable Fe K$α$ line in NGC 4051

Details Rapidly variable Fe K$α$ line in NGC 4051 Rapidly variable Fe K$α$ line in NGC 4051

1999-04-23

arxiv.org/abs/astro-ph/9904321v1

Astronomy and Astrophysics

Astrophysics

12 pages with 5 figures, to appear in ApJ Vol. 516, L65

Scientific paper

10.1086/312004

We present a detailed analysis on the variability of the Fe K emission line in NGC 4051 using ASCA data. Through simple Gaussian line fits, we find not only obvious Fe K line variability with no significant difference in the X-ray continuum flux between two ASCA observations which were separated by $\sim$ 440 days, but also rapid variability of Fe K line on time scales $\sim 10^4$ s within the second observation. During the second observation, the line is strong (EW = 733$^{+206}_{-219}$ eV) and broad ($\sigma = 0.96^{+0.49}_{-0.35}$ keV) when the source is brightest, and become weaker (EW = 165$^{+87}_{-86}$ eV) and narrower ($\sigma<0.09$ keV) whilst the source is weakest. The equivalent width of Fe K line correlates positively with the continuum flux, which shows an opposite trend with another Seyfert 1 galaxy MCG --6-30-15.

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