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A Close Quasar Pair in a Massive Galaxy Merger at z=5.7
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DOI：10.3847/2041-8213/ae5e5b.png)
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Abstract
En 中文
Close quasar pairs are rare products of galaxy mergers in which both supermassive black holes (SMBHs) are actively accreting, offering strong constraints on merger-driven active galactic nuclei evolution. Identifying close quasar pairs at z greater than or similar to 4 is challenging due to the declining quasar number density in the early Universe. Here we report the confirmation of a close quasar pair at z = 5.7, J2037-4537, utilizing high-resolution Atacama Large Millimeter/submillimeter Array observations. The quasar host galaxies exhibit tidal disturbed features in both the far-infrared continuum emission and the [C ii] line emission, ruling out the doubly imaged lensed quasar scenario. The two quasar hosts are massive (M-dyn greater than or similar to 10(10)M(circle dot)) and star-forming (star formation rate greater than or similar to 500M(circle dot) yr(-1)). The confirmation of J2037-4537 puts a lower limit on the quasar pair fraction at 5.5 < z < 6, F-pair > 1.2%, which is much higher than the quasar pair fraction at z less than or similar to 4. J2037-4537 is expected to form a gravitationally bound SMBH binary within less than or similar to 2 Gyr. The elevated quasar pair fraction at z > 5.5, as indicated by J2037-4537, likely contributes to the high gravitational-wave background reported by recent pulsar timing array experiments.
Keywords:
GRAVITATIONALLY LENSED QUASARS
SUPERMASSIVE BLACK-HOLES
HIGH-Z EXPLORATION
C II SURVEY
LUMINOSITY FUNCTION
HOST GALAXIES
TWIN QUASARS
DATA RELEASE
OFF-NUCLEUS
AGN
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11.7
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