A COMPARISON OF HARD X-RAY PHOTON INDICES AND IRON K{alpha} EMISSION LINES IN X-RAY LUMINOUS NARROW- AND BROAD-LINE SEYFERT 1 GALAXIES
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
We use publicly available XMM-Newton data to systematically compare the hard X-ray photon indices, {gamma}{sub 2-10keV}, and the iron K{alpha} emission lines of narrow- and broad-line Seyfert 1 (NLS1 and BLS1) galaxies. We compile a flux-limited (f {sub 2-10keV} {>=} 1 x 10{sup -12} erg s{sup -1} cm{sup -2}) sample including 114 radio-quiet objects, with the 2-10 keV luminosity ranging from 10{sup 41} to 10{sup 45} erg s{sup -1}. Our main results are: (1) NLS1s and BLS1s show similar luminosity distributions; (2) the weighted means of {gamma}{sub 2-10keV} 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 {gamma}{sub 2-10keV} and FWHMH{beta} suggests that {gamma}{sub 2-10keV} > 2.0 may be taken to indicate the 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 active galactic nucleus; and (4) all the broadened iron K{alpha} lines with intrinsic width {sigma}>0.5 keV correspond to FWHMH{beta} {<=}4000 km s{sup -1}.
- OSTI ID:
- 21305054
- Journal Information:
- Astrophysical Journal Letters, Vol. 713, Issue 1; Other Information: DOI: 10.1088/2041-8205/713/1/L11; Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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