Detection of a QPO in five XMM-Newton observations of RE J1034+396


Type
Article
Change log
Authors
Alston, WN 
Markevičiute, J 
Kara, E 
Fabian, AC 
Middleton, M 
Abstract

The X-ray quasi-periodic oscillation (QPO) at ∼2.6×10−4 Hz in RE J1034+396 has been robustly observed in the 0.2-10 keV band of one ∼90 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 ∼2.6×10−4 Hz over ∼4 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 ∼250 ks), allowing for a better understanding of the QPO phenomenon observed in both Active Galactic Nuclei (AGN) and black hole X-ray binaries (BHBs).

Description
Keywords
galaxies: individual: RE J1034+396, galaxies: Seyfert, X-rays: galaxies
Journal Title
Monthly Notices of the Royal Astronomical Society: Letters
Conference Name
Journal ISSN
1745-3925
1745-3933
Volume Title
445
Publisher
Oxford University Press (OUP)
Sponsorship
Science and Technology Facilities Council (ST/K000985/1)
European Commission (312789)