Investigation into the origin of the soft excess in Ark 564 using principal component analysis

Open Access

Fig. 2.

First three significant PCs of Ark 564 in different epochs: Obs 1–5 (red cross symbol), Obs 6–9 (blue circle), and Obs 10-13 (green triangle). The variability percentage of the three components is 88%–6%–1% for the Obs 1–5, 94%–3%–1% for the Obs 6–9, and 92%–3%–1% for the Obs 10–13, respectively.

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