Discovery of a binary quasar at z~0.2 with 430 pc separation indicating a bound SMBH pair each >4e8 Msun, with 2.5 Gyr upper limit on merger timescale and implications for the PTA gravitational wave background.
R., Vallisneri, M., Ellis, J
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Discovery of a close-separation binary quasar at the heart of a z~0.2 merging galaxy and its implications for low-frequency gravitational waves
Discovery of a binary quasar at z~0.2 with 430 pc separation indicating a bound SMBH pair each >4e8 Msun, with 2.5 Gyr upper limit on merger timescale and implications for the PTA gravitational wave background.