Ying Tan, Junxian Wang, Xinwen Shu, Youyuan Zhou
We present XMM-Newton spectra of the Seyfert 2 Galaxy IRAS 00521-7054. A
strong feature at ~6 keV (observer's frame) can be formally fitted with a
strong (EW=1.3+-0.3 keV in the rest frame) and broad Fe Ka line, extending down
to 3 keV. The underlying X-ray continuum could be fitted with an absorbed
powerlaw (with Gamma = 1.8+-0.2 and N_H = 5.9 x 10^22 cm^-2) plus a soft
component. If due to relativistically smeared reflection by an X-ray
illuminated accretion disk, the spin of the supermassive black hole is
constrained to be 0.97^+0.03_-0.13 (errors at 90% confidence level for one
interesting parameter), and the accretion system is viewed at an inclination
angle of 37+-4 degree. This would be the first type 2 AGN reported with strong
red Fe Ka wing detected which demands a fast rotating SMBH. The unusually large
EW would suggest that the light bending effect is strong in this source.
Alternatively, the spectra could be fitted by a dual absorber model (though
with a global chi^2 higher by ~ 6 for 283 d.o.f) with N_H1 = 7.0 x 10^22 cm^-2
covering 100% of the X-ray source, and N_H2 = 21.7 x 10^22 cm^-2 covering 71%,
which does not require an extra broad Fe Ka line.
View original:
http://arxiv.org/abs/1202.0400
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