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X-ray flares from active galaxy GSN 069

X-ray flares from active galaxy GSN 069


Date: 11 September 2019
Satellite: XMM-Newton and Chandra
Depicts: X-ray lightcurve of active galaxy GSN 069
Copyright: ESA/XMM-Newton; NASA/CXC; G. Miniutti (CAB, CSIC-INTA, Spain)

Variations in the X-ray brightness of the active black hole at the core of distant galaxy GSN 069, about 250 million light years away, as recorded by ESA's XMM-Newton X-ray observatory (blue) and NASA's Chandra X-ray observatory (red). The graph shows the X-ray brightness of the source relative to its 'dormant' level.

This source was first observed to undergo before-seen flashes on 24 December 2018, when its brightness suddenly increased by up to a factor 100, then dimmed back to its normal levels within one hour and lit up again nine hours later. Further observations performed over a period of 54 days confirmed this flaring behaviour, with 'quasi-periodic eruptions', or QPEs detected every nine hours.

Although never before observed, scientists think periodic flares like these might actually be quite common in the Universe.

Last Update: 11 September 2019
17-Sep-2019 20:37 UT

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