A comparison of hard X-ray photon indices and iron \ka emission lines in X-ray luminous narrow- and broad-line Seyfert 1 galaxies

Abstract

We use publicly available XMM-Newton data to systematically compare the hard X-ray photon indices, ${\Gamma }_{2-10\mathrm{keV}}$ and the iron K$\alpha$ emission lines of narrow-line (NL) and broad-line Seyfert 1 (BLS1) galaxies. We compile a flux-limited ($f_{2-10\mathrm{keV}}\ge 1\times 10^{-12}$ 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 ${\Gamma }_{2-10\mathrm{keV}}$ of NLS1s, BLS1s and the total sample is $2.04\pm 0.04$, $1.74\pm 0.02$, $1.84\pm 0.02$, respectively; a significant anti-correlation between \ga and FWHMH$\beta$ suggests that ${\Gamma }_{2-10\mathrm{keV}}>2.0$ 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 $\leq 4000 ~\kms$.

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