Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-03-09
2010, ApJ, 713, L11
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Scientific paper
10.1088/2041-8205/713/1/L11
We use publicly available XMM-Newton data to systematically compare the hard X-ray photon indices, $\Gamma_{\rm 2-10\ keV}$ and the iron K$\alpha$ emission lines of narrow-line (NL) and broad-line Seyfert 1 (BLS1) galaxies. We compile a flux-limited ($f_{\rm 2-10\ keV} \geq 1 \times 10^{-12}$ erg s$^{-1}$ cm$^{-2}$) sample including 114 radio-quiet objects, with the 2-10 keV luminosity ranging from 10$^{41}$ to 10$^{45}$ erg s$^{-1}$. Our main results are: 1) NLS1s and BLS1s show similar luminosity distributions; 2) The weighted mean of $\Gamma_{\rm 2-10\ keV}$ of NLS1s, BLS1s and the total sample is $2.04\pm0.04$, $1.74\pm0.02$, $1.84\pm0.02$, respectively; a significant anti-correlation between \ga and FWHMH$\beta$ suggests that $\Gamma_{\rm 2-10\ keV} > 2.0$ may be taken to indicate X-ray luminous NLS1 type; 3) The 6.4 keV narrow iron K$\alpha$ lines from NLS1s are generally weaker than that from BLS1s; this would indicate a smaller covering factor of the dusty tori in NLS1s, if the line emission originates from the inner boundary region of the dusty torus in an AGN; 4) all the broadened iron K$\alpha$ lines with intrinsic width $\sigma>0.5$ keV correspond to FWHM\hb $\leq 4000 ~\kms$.
Zhang Shuang-Nan
Zhou Xin-Lin
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