Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-16
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, accepted for publication in Astronomy and Astrophysics Letters
Scientific paper
10.1051/0004-6361:20077331
The existence of an anti-correlation between the Equivalent Width (EW) of the neutral narrow core of the iron Kalpha emission line and the 2-10 keV luminosity (the so-called `X-ray Baldwin' or `Iwasawa-Taniguchi' effect) has been debated in the last years. We aim at testing this claim on the largest catalogue of radio quiet AGN high-quality X-ray spectra ever published. The final sample comprises 157 objects. We search for a relation of the iron line EW not only with the X-ray luminosity, but also with the Black Hole mass, the Eddington ratio and the cosmological distance. The data presented here were analyzed homogeneously, all spectra are from the same instrument and with high Signal-to-Noise Ratio. A linear censored fit on the EW versus 2-10 keV luminosity is highly significant and yields $\log(EW_{Fe}) = (1.73\pm0.03) + (-0.17\pm0.03) \log(L_{X,44})$, where $EW_{Fe}$ is the EW of the neutral iron Kalpha line in eV and $L_{x,44}$ is the 2-10 keV X-ray luminosity in units of $10^{44}$ erg s$^{-1}$. The anti-correlation with the Eddington ratio is also very significant, while no dependence of the iron EW on the BH mass is apparent.
Bianchi Stefano
Fonseca Bonilla Nuria
Guainazzi Matteo
Matt Giorgio
No associations
LandOfFree
On the Iwasawa-Taniguchi effect of radio-quiet AGN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the Iwasawa-Taniguchi effect of radio-quiet AGN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Iwasawa-Taniguchi effect of radio-quiet AGN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-679230