your ID: 0070 
First Name: Peng 
Last Name: Jiang 
Affiliation: Center for Astrophysics 
Title: On the X-ray Baldwin effect 
Authors: P.Jiang,J.X.Wang & T.G.Wang 
Topic: 6 
Session: oral 
Abstract: Most Active Galactic Nuclei (AGN) exhibit a narrow Fe K line at 6.4 keV 
in the X-ray spectra, due to the fluorescent emission from cold material far from 
the inner accretion disk. Using XMM-Newton observations, Page et al. found that 
the equivalent width (EW) of the narrow Fe K line decreases with increasing luminosity,
suggesting a decrease in the covering factor of the material emitting the line (presumably the torus). 
By combining the archival Chandra HETG observations of 34 type 1 AGNs with XMM 
observations in literature, we build a much large sample with 101 AGNs. 
We find a similar X-ray Baldwin effect in the sample , however, we note that the anti-correlation 
is dominated by the radio loud AGN in the sample, whose X-ray spectra might be contaminated 
by the relativistic jet. Excluding the radio loud AGN, we find a much weaker anti-correlation. 
We present Monte-Carlo simulations showinganti-correlation can be attributed to the relative 
short time scale variations of the X-ray continuum, that such a weak anti-correlation can be 
attributed to the relative short time scale variations of the X-ray continuum.