New insights on the recoiling/binary black hole candidate J0927+2943 via molecular gas observations

Understand

The peculiar QSO J0927+2943 shows multiple sets of emission lines in its optical spectrum.

• This signature has been interpreted as the relative motion between a black hole, either recoiling or bound in a binary system, and its host galaxy, or as a superposition of two galaxies along the line of sight.
• In order to test these scenarios, we have collected 2mm CO(2-1) observations using the IRAM Plateau de Bure Interferometer, and optical images and spectroscopy at the Calar Alto observatory.
• Together with archival HST images, these data provide unique insights on the nature of this system.