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Is there a UV/X-ray connection in IRAS 13224-3809?

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arxiv 1712.06606 v1 pith:WYUIQBY4 submitted 2017-12-18 astro-ph.HE astro-ph.GA

D. J. K. Buisson , A. M. Lohfink , W. N. Alston , E. M. Cackett , C.-Y. Chiang , T. Dauser , B. De Marco , A. C. Fabian
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L. C. Gallo J. A. García J. Jiang E. Kara M. J. Middleton G. Miniutti M. L. Parker C. Pinto P. Uttley D. J. Walton D. R. Wilkins
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classification astro-ph.HEastro-ph.GA
keywords x-raydiscfluxirascoronalmonitoringstrongvariability
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We present results from the optical, ultraviolet and X-ray monitoring of the NLS1 galaxy IRAS 13224-3809 taken with Swift and XMM-Newton during 2016. IRAS 13224-3809 is the most variable bright AGN in the X-ray sky and shows strong X-ray reflection, implying that the X-rays strongly illuminate the inner disc. Therefore, it is a good candidate to study the relationship between coronal X-ray and disc UV emission. However, we find no correlation between the X-ray and UV flux over the available ~40 day monitoring, despite the presence of strong X-ray variability and the variable part of the UV spectrum being consistent with irradiation of a standard thin disc. This means either that the X-ray flux which irradiates the UV emitting outer disc does not correlate with the X-ray flux in our line of sight and/or that another process drives the majority of the UV variability. The former case may be due to changes in coronal geometry, absorption or scattering between the corona and the disc.

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Cited by 2 Pith papers

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  1. First detection of ultra-fast outflows in a quiescent galaxy

    astro-ph.GA 2026-07 conditional novelty 7.0 of 10

    First detection of an ultra-fast outflow (v≈0.07c) in a quiescent galaxy quenched ~9 Gyr ago, suggesting AGN winds can maintain quiescence independent of global star formation.

  2. Disk reflection as the origin of the X-ray polarization of NGC 4151 with IXPE

    astro-ph.HE 2026-06 unverdicted novelty 5.0 of 10

    Disk reflection from a compact lamp-post corona explains the X-ray polarization and spectra of NGC 4151.

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