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A hard look at the X-ray spectral variability of NGC 7582
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SYSNO ASEP 0574438 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A hard look at the X-ray spectral variability of NGC 7582 Author(s) Lefkir, M. (GB)
Kammoun, E. (IT)
Barret, D. (FR)
Boorman, Peter G. (ASU-R) ORCID
Matzeu, G. A. (IT)
Miller, J. M. (US)
Nardini, E. (IT)
Zoghbi, A. (US)Number of authors 8 Source Title Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 522, č. 1 (2023), s. 1169-1182Number of pages 14 s. Publication form Online - E Language eng - English Country US - United States Keywords galaxies ; X-rays ; accretion discs OECD category Astronomy (including astrophysics,space science) Method of publishing Open access Institutional support ASU-R - RVO:67985815 UT WOS 000991993800069 EID SCOPUS 85160446726 DOI 10.1093/mnras/stad995 Annotation NGC 7582 (z = 0.005264, D = 22.5 Mpc) is a highly variable, changing-look AGN. In this work, we explore the X-ray properties of this source using XMM-Newton and NuSTAR archival observations in the 3 40 keV range, from 2001 to 2016. NGC 7582 exhibits a long-term variability between observations but also a short-term variability in two observations that has not been studied before. To study the variability, we perform a time-resolved spectral analysis using a phenomenological model and a physically motivated model (uxclumpy). The spectral fitting is achieved using a nested sampling Monte Carlo method. Uxclumpy enables testing various geometries of the absorber that may fit AGN spectra. We find that the best model is composed of a fully covering clumpy absorber. From this geometry, we estimate the velocity, size, and distance of the clumps. The column density of the absorber in the line of sight varies from Compton-thin to Compton-thick between observations. Variability over the time-scale of a few tens of kiloseconds is also observed within two observations. The obscuring clouds are consistent with being located at a distance not larger than 0.6 pc, moving with a transverse velocity exceeding & SIM, 700 km s(-1). We could put only a lower limit on the size of the obscuring cloud being larger than 10(13) cm. Given the sparsity of the observations, and the limited exposure time per observation available, we cannot determine the exact structure of the obscuring clouds. The results are broadly consistent with comet-like obscuring clouds or spherical clouds with a non-uniform density profile. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0345566
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