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The 1.5 Ms observing campaign on IRAS 13224−3809 – I. X-ray spectral analysis

Jiachen JiangInstitute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UKM. L. ParkerEuropean Space Agency (ESA), European Space Astronomy Centre (ESAC), E-28691 Villanueva de la Cañada, Madrid, SpainA. C. FabianInstitute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UKWilliam AlstonInstitute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UKD. J. K. BuissonInstitute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UKEdward M. CackettDepartment of Physics and Astronomy, Wayne State University, 666 W, Hancock Street, Detroit, MI 48201, USAChia-Ying ChiangDepartment of Physics and Astronomy, Wayne State University, 666 W, Hancock Street, Detroit, MI 48201, USAThomas DauserDr Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics, Sternwartstr. 7, D-96049 Bamberg, GermanyLuigi GalloDepartment of Astronomy and Physics, Saint Mary’s University, 923 Robie Street, Halifax, NS, B3H 3C3, CanadaJavier A. GarcíaCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAFiona A. HarrisonCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAA. LohfinkDepartment of Physics, Montana State University, Bozeman, MT 59717-3840, USABarbara De MarcoNicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warsaw, PolandErin KaraDepartment of Astronomy, University of Maryland, College Park, MD 20742-2421, USAJ. M. MïllerDepartment of Astronomy, University of Michigan, 1085 South University, Ann Arbor, MI 48109, USAG. MiniuttiCentro de Astrobiología (INTA–CSIC), Dep. de Astrofísica, ESAC campus, E-28692 Villanueva de la Cañada, SpainC. PintoInstitute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UKD. J. WaltonInstitute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UKDan WilkinsKavli Institute of Particle Astrophysics and Cosmology, Standford University, 452 Lomita Mall, Stanford, CA 94305, USA

2018en

ABI

Annotatsiya

We present a detailed spectral analysis of the recent 1.5 Ms XMM–Newton observing campaign on the narrow-line Seyfert 1 galaxy IRAS 13224−3809, taken simultaneously with 500 ks of NuSTAR data. The X-ray light curve shows three flux peaks, registering at about 100 times the minimum flux seen during the campaign, and rapid variability with a time-scale of kiloseconds. The spectra are well fit with a primary power-law continuum, two relativistic-blurred reflection components from the inner accretion disc with very high iron abundance, and a simple blackbody-shaped model for the remaining soft excess. The spectral variability is dominated by the power-law continuum from a corona region within a few gravitational radii from the black hole. Additionally, blueshifted Ne X, Mg XII, Si XIV, and S XVI absorption lines are identified in the stacked low-flux spectrum, confirming the presence of a highly ionized outflow with velocity up to v = 0.267 and 0.225 c. We fit the absorption features with xstar models and find a relatively constant velocity outflow through the whole observation. Finally, we replace the bbody and supersolar abundance reflection models by fitting the soft excess successfully with the extended reflection model relxillD, which allows for higher densities than the standard relxill model. This returns a disc electron density n_e > 10^(18.7) cm^(−3) and lowers the iron abundance from Z_(Fe) = 24^(+3)_(−4)Z_⊙ with n-e = 10^(15) cm^(-3) to Z_(Fe) = 6.6^(+0.8)_(-2.1)Z_⊙.

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DOI: 10.1093/mnras/sty836

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