Is there a UV/X-ray connection in IRAS 13224-3809?
Is there a UV/X-ray connection in IRAS 13224-3809?
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DOI：
10.1093/mnras/sty008
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发表时间：
2017-12
影响因子：
4.8
通讯作者：
D. Buisson;A. Lohfink;W. Alston;E. Cackett;C. Chiang;T. Dauser;B. Marco;A. Fabian;L. Gallo;J. Garc'ia;J. Jiang;E. Kara;M. Middleton;G. Miniutti;M. Parker;C. Pinto;P. Uttley;D. Walton;D. Wilkins
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文献类型：
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作者：
D. Buisson;A. Lohfink;W. Alston;E. Cackett;C. Chiang;T. Dauser;B. Marco;A. Fabian;L. Gallo;J. Garc'ia;J. Jiang;E. Kara;M. Middleton;G. Miniutti;M. Parker;C. Pinto;P. Uttley;D. Walton;D. Wilkins
我们介绍了2016年期间使用Swift和XMM-Newton拍摄的NLS 1星系IRAS 13224−3809的光学，紫外和X射线监测结果。IRAS 13224−3809是X射线天空中变化最大的明亮活动星系核，并显示出强烈的X射线反射，这意味着X射线强烈地照亮了内部圆盘。因此，这是一个很好的候选人来研究日冕X射线和光盘紫外辐射之间的关系。然而，我们发现没有相关性的X-射线和紫外线通量超过可用的10040天的监测，尽管存在较强的X-射线的可变性和可变部分的紫外线光谱是一致的照射的标准薄光盘。这意味着照射UV发射外盘的X射线通量与我们视线中的X射线通量不相关，和/或另一个过程驱动大部分UV可变性。前一种情况可能是由于日冕几何形状的变化，日冕和椎间盘之间的吸收或散射。
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 d 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.