NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T11:32:26 PDT
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For refcode 2013MNRAS.435.1840R:
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Copyright by Royal Astronomical Society. 2013MNRAS.435.1840R On the role of the Gamma - lambda_Edd_ relation on the X-ray Baldwin effect in active galactic nuclei Ricci, C.; Paltani, S.; Ueda, Y.; Awaki, H. Abstract. The X-ray Baldwin effect is the inverse correlation between the equivalent width (EW) of the narrow component of the iron Kalpha line and the X-ray luminosity of active galactic nuclei (AGN). A similar trend has also been observed between Fe Kalpha EW and the Eddington ratio (lambda_Edd_). Using Chandra/High Energy Grating results of Shu et al. and bolometric corrections we study the relation between EW and lambda_Edd_, and find that log EW = (- 0.13 +/- 0.03)log lambda_Edd_ + 1.47. We explore the role of the known positive correlation between the photon index of the primary X-ray continuum Gamma and lambda_Edd_ on the X-ray Baldwin effect. We simulate the iron Kalpha line emitted by populations of unabsorbed AGN considering three different geometries of the reflecting material: toroidal, spherical-toroidal and slab. We find that the Gamma-lambda_Edd_ correlation cannot account for the whole X-ray Baldwin effect, unless a strong dependence of Gamma on lambda_Edd_, such as the one recently found by Risaliti et al. and Jin et al., is assumed. No clear correlation is found between EW and Gamma. We conclude that a good understanding of the slope of the Gamma-lambda_Edd_ relation is critical to assess whether the trend plays a leading or rather a marginal role in the X-ray Baldwin effect. Key words: galaxies: active, galaxies: nuclei, quasars: emission lines, quasars: general, galaxies: Seyfert, X-rays: galaxies
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