A POSSIBLE ULTRA STRONG AND BROAD Fe K alpha EMISSION LINE IN SEYFERT 2 GALAXY IRAS 00521-7054

作者：Tan Y^*; Wang J X; Shu X W; Zhou Youyuan

来源：Astrophysical Journal Letters, 2012, 747(1): L11.

DOI：10.1088/2041-8205/747/1/L11

• galaxies: active
• galaxies: Seyfert
• X-rays: individual (IRAS 00521-7054)

We present XMM-Newton spectra of the Seyfert 2 Galaxy IRAS 00521-7054. A strong feature at similar to 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 K alpha line, extending down to 3 keV. The underlying X-ray continuum could be fitted with an absorbed power law (with Gamma = 1.8 +/- 0.2 and N-H = 5.9(-0.7)(+0.6) 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 (SMBH) is constrained to be 0.97(-0.13)(+0.03) (errors at 90% confidence level for one interesting parameter), and the accretion system is viewed at an inclination angle of 37 degrees +/- 4 degrees. This would be the first type 2 active galactic nucleus reported with strong red Fe K alpha 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 similar to 6 for 283 dof) with N-H1 = 7.0 +/- 0.8 x 10(22) cm(-2) covering 100% of the X-ray source, and N-H2 = 21.7(-5.4)(+5.6) x 10(22) cm(-2) covering 71%, which does not require an extra broad Fe K alpha line.

• 出版日期2012-3-1
• 单位中国科学院