In the narrow-line Seyfert 1 galaxy 1H 0707-495 , recently a transient quasi-periodic oscillation ( QPO ) signal with a frequency of \sim 2.6 \times 10 ^ { -4 } Hz has been detected at a high statistical significance .
Here , we reanalyze the same set of XMM-Newton data observed on 2008 February 4 with the Weighted-Wavelet Z-transform ( WWZ ) method .
In addition to confirming the previous findings , we also find another QPO signal with a frequency of \sim 1.2 \times 10 ^ { -4 } Hz in a separated X-ray emission phase at the significance level of \sim 3.7 \sigma .
The signal is also found fitting an auto-regressive model though at a lower significance .
The frequency ratio between these two signals is \sim 2 : 1 .
The analysis of other XMM-Newton measurements of 1H 0707-495 also reveals the presence of the \sim 2.6 \times 10 ^ { -4 } Hz ( \sim 1.2 \times 10 ^ { -4 } Hz ) QPO signal on 2007 May 14 ( 2010 September 17 ) at the significance level of \sim 4.2 \sigma ( \sim 3.5 \sigma ) .
The QPO frequency found in this work follows the f _ { QPO } - M _ { BH } relation reported in previous works spanning from stellar-mass to supermassive black holes .
This is the first time to observe two separated transient X-ray QPO signals in active galactic nuclei ( AGNs ) , which sheds new light on the physics of accreting supermassive black holes .