2017ApJ...849....9Z -
Astrophys. J., 849, 9-9 (2017/November-8)
An X-ray periodicity of ∼1.8 hr in narrow-line Seyfert 1 galaxy Mrk 766.
ZHANG P., ZHANG P.-F., YAN J.-Z., FAN Y.-Z. and LIU Q.-Z.
Abstract (from CDS):
In the narrow-line Seyfert 1 galaxy Mrk 766, a quasi-periodic oscillation (QPO) signal with a period of ∼6450 s is detected in the XMM-Newton data collected on 2005 May 31. This QPO signal is highly statistically significant at the ∼5σ confidence level, with a quality factor of Q=f/Δf 13.6. The X-ray intensity changed by a factor of 3, with a root mean square fractional variability of 14.3%. Furthermore, this QPO signal is present in the data of all three EPIC detectors and two RGS cameras and its frequency follows the fQPO-MBH relation spanning from stellar-mass to supermassive black holes. Interestingly, a possible QPO signal with a period of ∼4200 s had been reported in the literature. The frequency ratio of these two QPO signals is ∼3:2. Our result is also in support of the hypothesis that the QPO signals can just be transient. The spectral analysis reveals that the contribution of the soft excess component below ∼1 keV is different between epochs with and without QPO. This property, as well as the former frequency ratio, are well-detected in X-ray BH binaries, which may shed some light on the physical origins of our event.
Abstract Copyright:
© 2017. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: active - galaxies: individual: Mrk 766 - galaxies: nuclei - X-rays: galaxies - X-rays: galaxies
Simbad objects:
6
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