A Comparison of Hard X-ray Photon Indices and Iron Kα 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, Γ2-10 keV , and the iron Kα emission lines of narrow- and broad-line Seyfert 1 (NLS1 and BLS1) galaxies. We compile a flux-limited (f 2-10 keV >= 1 × 10-12 erg s-1 cm-2) sample including 114 radio-quiet objects, with the 2-10 keV luminosity ranging from 1041 to 1045 erg s-1. Our main results are: (1) NLS1s and BLS1s show similar luminosity distributions; (2) the weighted means of Γ2-10 keV of NLS1s, BLS1s, and the total sample are 2.04 ± 0.04, 1.74 ± 0.02, and 1.84 ± 0.02, respectively; a significant anti-correlation between Γ2-10 keV and FWHMHβ suggests that Γ2-10 keV > 2.0 may be taken to indicate the X-ray luminous NLS1 type; (3) the 6.4 keV narrow iron Kα 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 active galactic nucleus; and (4) all the broadened iron Kα lines with intrinsic width σ>0.5 keV correspond to FWHMHβ <=4000 km s-1.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 2010
- DOI:
- 10.1088/2041-8205/713/1/L11
- arXiv:
- arXiv:1003.1772
- Bibcode:
- 2010ApJ...713L..11Z
- Keywords:
-
- accretion;
- accretion disks;
- line: profiles;
- surveys;
- X-rays: galaxies;
- Astrophysics - Galaxy Astrophysics
- E-Print:
- 2010, ApJ, 713, L11