Multi-phase black-hole feedback and a bright [CII] halo in a Lo-BAL quasar at z∼6.6
arxiv(2024)
摘要
Although the mass growth of supermassive black holes during the Epoch of
Reionisation is expected to play a role in shaping the concurrent growth of
their host-galaxies, observational evidence of feedback at z≳6 is still
sparse. We perform the first multi-scale and multi-phase characterisation of
black-hole driven outflows in the z∼6.6 quasar J0923+0402 and assess how
these winds impact the cold gas reservoir. We employ the SimBAL spectral
synthesis to fit broad absorption line (BAL) features and find a powerful
ionized outflow on ≲210 pc scale, with a kinetic power ∼2-100%
of the quasar luminosity. ALMA observations of [CII] emission allow us to study
the morphology and kinematics of the cold gas. We detect high-velocity [CII]
emission, likely associated with a cold neutral outflow at ∼0.5-2 kpc
scale in the host-galaxy, and a bright extended [CII] halo with a size of
∼15 kpc. For the first time at such an early epoch, we accurately
constrain the outflow energetics in both the ionized and the atomic neutral gas
phases. We find such energetics to be consistent with expectations for an
efficient feedback mechanism, and both ejective and preventative feedback modes
are likely at play. The scales and energetics of the ionized and atomic
outflows suggest that they might be associated with different quasar accretion
episodes. The results of this work indicate that strong black hole feedback is
occurring in quasars at z≳6 and is likely responsible for shaping the
properties of the cold gas reservoir up to circum-galactic scales.
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