Broad iron line in the AO2 ASCA observation of the Seyfert 1 galaxy NGC 4051.

Details Broad iron line in the AO2 ASCA observation of the Seyfert 1 galaxy NGC 4051. Broad iron line in the AO2 ASCA observation of the Seyfert 1 galaxy NGC 4051.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..451g&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 451 - 452

Astronomy and Astrophysics

Astrophysics

1

Seyfert Galaxies: Iron Lines

Scientific paper

The detection of a broad K-fluorescence iron emission line in the AO2 ASCA observation of the peculiar Seyfert 1 galaxy NGC 4051 is reported. The Gaussian dispersion σ is bigger than 0.2 keV at the 99% level of confidence if reflection by a plane-parallel infinite slab is assumed. If the origin of the line is an X-ray illuminated relativistic disk, the detected line profile is consistent both with a "cold" disk at moderate inclination (i ≅ 30°) and with an almost face-on ionized disk. The hypothesis of a "warm" reflector might account for the relatively high equivalent width (≡300 eV). Such outcomes are in good agreement with the first evidence of the skewed and broad line profile detected by ASCA in a 200-ks observation of the archetypical Seyfert 1 galaxy MCG -6-30-15 (Tanaka et al. 1995).

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