Two Transient X-Ray Quasi-periodic Oscillations Separated by an Intermediate State in 1H 0707-495

In the narrow-line Seyfert 1 galaxy 1H 0707-495, recently a transient quasi-periodic oscillation (QPO) signal with a frequency of 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-transf...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2018-02, Vol.853 (2), p.193
Main Authors: Zhang, Peng-fei, Zhang, Peng, Liao, Neng-hui, Yan, Jing-zhi, Fan, Yi-zhong, Liu, Qing-zhong
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astrophysics
Autoregressive models
Black holes
Deposition
Emission
Galaxies
galaxies: active
galaxies: individual (1H 0707-495)
galaxies: nuclei
Quasi-Periodic Oscillations
Seyfert galaxies
Stellar mass
Supermassive black holes
Wavelet analysis
X-ray emissions
X-rays: galaxies
XMM (spacecraft)
Z transforms
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the narrow-line Seyfert 1 galaxy 1H 0707-495, recently a transient quasi-periodic oscillation (QPO) signal with a frequency of 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 method. In addition to confirming the previous findings, we also find another QPO signal with a frequency of Hz in a separated X-ray emission phase at the significance level of . The signal is also found fitting an autoregressive model though at a lower significance. The frequency ratio between these two signals is . The analysis of other XMM-Newton measurements of 1H 0707-495 also reveals the presence of the Hz ( Hz) QPO signal on 2007 May 14 (2010 September 17) at the significance level of ( ). The QPO frequency found in this work follows the relation reported in previous works spanning from stellar mass to supermassive black holes. This is the first observation of two separated transient X-ray QPO signals in active galactic nuclei, which sheds a new light on the physics of accreting supermassive black holes.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aaa29a