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27 April 2024 |
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Two transient X-ray Quasi-Periodic Oscillations separated by an intermediate state in 1H 0707-459 | | Peng-Fei Zhang
; Peng Zhang
; Neng-Hui Liao
; Jing-Zhi Yan
; Yi-Zhong Fan
; Qing-Zhong Liu
; | | Date: |
21 Mar 2017 | | Abstract: | In the narrow-line Seyfert 1 galaxy 1H 0707-495, recently a transient
quasi-periodic oscillation (QPO) signal has been detected at a high statistical
significance. Here, we reanalyze the same set of XMM-Newton data measured on
2008 February 4 with the Weighted-Wavelet Z-transform (WWZ) method. In addition
to confirm the previous finding we find the other QPO signal in a separated
X-ray emission phase at a confidence level of $sim 4.1sigma$. The frequency
ratio between these two signals is $sim 2:1$. These two signals also appeared,
though at lower significance levels, in XMM-Newton measurements on 2007 May 14
and 2010 September 17, individually. This is the first time to observe two
separated transient X-ray QPOs in active galactic nuclei (AGNs), which sheds
new light on the physics of accreting supermassive black holes. | | Source: | arXiv, 1703.7186 | | Services: | Forum | Review | PDF | Favorites | |
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