XMM-Newton observations of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: X-ray spectral analysis II

Jiang J, Dauser T, Fabian AC, Alston WN, Gallo LC, Parker ML, Reynolds CS (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Monthly Notices of the Royal Astronomical Society Oxford University Press

Book Volume: 514

Pages Range: 1107-1121

Journal Issue: 1

DOI: 10.1093/mnras/stac1144

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(e) approximate to 10(20) cm(-3) and an iron abundance of Z(Fe) = 3.2 +/- 0.5 Z(circle dot) is used to fit the broad-band spectra of this source. No additional component is required to fit the soft excess. Our best-fitting model provides consistent measurements of black hole spin and disc inclination angle as 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-fitting density and ionization parameters, which changes from 0.43 root integral(AD)/integral(INF) r(g) in the lowest flux state to 1.71 root integral(AD)/integral(INF) r(g) in the highest flux state assuming a black hole mass of 2 x 10(6) M-circle dot. f(AD)/f(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 'lamppost' 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.

Authors with CRIS profile

Thomas Dauser Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut

Involved external institutions

University of Cambridge GB United Kingdom (GB) European Space Agency (ESA) FR France (FR) Saint Mary's University CA Canada (CA)

How to cite

APA:

Jiang, J., Dauser, T., Fabian, A.C., Alston, W.N., Gallo, L.C., Parker, M.L., & Reynolds, C.S. (2022). XMM-Newton observations of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: X-ray spectral analysis II. Monthly Notices of the Royal Astronomical Society, 514(1), 1107-1121. https://dx.doi.org/10.1093/mnras/stac1144

MLA:

Jiang, Jiachen, et al. "XMM-Newton observations of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: X-ray spectral analysis II." Monthly Notices of the Royal Astronomical Society 514.1 (2022): 1107-1121.

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