Detection of a QPO in 5 XMM-Newton observations of RE J1034+396
Jul 29, 2014Citations per year
Abstract: (arXiv)
The X-ray quasi-periodic oscillation (QPO) at Hz in RE J1034+396 has been robustly observed in the 0.2-10 keV band of one ks XMM-Newton observation, but was not detected in subsequent observations. Here, we investigate the power spectral density (PSD) of 8 archival XMM-Newton observations of RE J1034+396, and search for the presence of QPOs in three energy bands: soft (0.3-0.8 keV); hard (1.0-4.0 keV) and total (0.2-10.0 keV). We find a significant detection of a QPO feature in the hard-band PSD of 5 low flux/spectrally-harder observations. The QPO frequency has remained persistent at Hz over years of observations, though it is no longer detected in the soft band, except in the original observation. This result increases the duration where the QPO is present by a factor of three (now ks), allowing for a better understanding of the QPO phenomenon observed in both Active Galactic Nuclei (AGN) and black hole X-ray binaries (BHBs).Note:
- 6 pages, 3 figures. Accepted for publication in MNRAS Letters
References(51)
Figures(6)