XMM-Newton Observations of the Narrow-Line Seyfert 1 Galaxy IRAS 13224$-$3809 : X-ray Spectral Analysis II

Abstract

Previously, we modelled the X-ray spectra of the narrow-line Seyfert 1 galaxy IRAS 13224$-$3809 using a disc reflection model with a fixed electron density of $10^{15}$ cm${}^{-3}$. An additional blackbody component was required to fit the soft X-ray excess below 2 keV. In this work, we analyse simultaneously five flux-resolved XMM-Newton spectra of this source comprising data collected over 2 Ms. A disc reflection model with an electron density of $n_{\mathrm{e}}\approx 10^{20}$ cm${}^{-3}$ and an iron abundance of $Z_{\mathrm{Fe}}=3.2\pm 0.5Z_{\odot }$ is used to fit the broad-band spectra of this source. No additional component is required to fit the soft excess. Our best-fit model provides consistent measurements of black hole spin and disc inclination angle as in previous models where a low disc density was assumed. In the end, we calculate the average illumination distance between the corona and the reflection region in the disc of IRAS 13224$-$3809 based on best-fit density and ionisation parameters, which changes from 0.43$\sqrt{f_{\mathrm{AD}}/f_{\mathrm{INF}}}$ $r_{\mathrm{g}}$ in the lowest flux state to 1.71$\sqrt{f_{\mathrm{AD}}/f_{\mathrm{INF}}}$ $r_{\mathrm{g}}$ in the highest flux state assuming a black hole mass of $2\times 10^6{M}_{\odot }$. $f_{\mathrm{AD}}/f_{\mathrm{INF}}$ is the ratio between the flux of the coronal emission that reaches the accretion disc and infinity. This ratio depends on the geometry of the coronal region in IRAS 13224$-$3809. So we only discuss its value based on the simple `lamp-post' model, although detailed modelling of the disc emissivity profile of IRAS 13224$-$3809 is required in future to reveal the exact geometry of the corona.

17 pages, 15 figures including appendices; accepted for publication in MNRAS

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Cited by in corpus (9)

• Revealing the intrinsic X-ray reverberation lags in IRAS 13224-3809 through the Granger causality test
• Coronal height constraint in IRAS 13224-3809 and 1H 0707-495 by the random forest regressor
• Hidden biases in flux-resolved X-ray spectroscopy
• Extracting the X-ray reverberation response functions from the AGN light curves using an autoencoder
• Constraining black hole spin in PG 1535+547 amidst complex multi-layered absorption
• A truncated inner disc in the Seyfert 1 galaxy WKK 4438
• Fast Outflowing Warm Absorbers in Narrow-Line Seyfert 1 Galaxy PG 1001+054 Revealed by HST/COS Spectra
• Mapping the X-ray corona evolution of IRAS 13224-3809 with the power spectral density
• Unveiling the dynamics of the ultra-fast outflow in IRAS 13224-3809 with X-ray spectroscopy