Computer Science
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008natur.455..369g&link_type=abstract
Nature, Volume 455, Issue 7211, pp. 369-371 (2008).
Computer Science
64
Scientific paper
Active galactic nuclei and quasars are thought to be scaled-up versions of Galactic black hole binaries, powered by accretion onto supermassive black holes with masses of 106-109, as opposed to the ~10 in binaries (here is the solar mass). One example of the similarities between these two types of systems is the characteristic rapid X-ray variability seen from the accretion flow. The power spectrum of this variability in black hole binaries consists of a broad noise with multiple quasi-periodic oscillations superimposed on it. Although the broad noise component has been observed in many active galactic nuclei, there have hitherto been no significant detections of quasi-periodic oscillations. Here we report the discovery of an ~1-hour X-ray periodicity in a bright active galaxy, RE J1034+396. The signal is highly statistically significant (at the 5.6σ level) and very coherent, with quality factor Q>16. The X-ray modulation arises from the direct vicinity of the black hole.
Done Chris
Gierlinski Marek
Middleton Matthew
Ward Martin
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