Widespread AGN feedback in a forming brightest cluster galaxy at z=4.1 unveiled by JWST
arxiv(2024)
摘要
We present rest-frame optical spectroscopy using JWST/NIRSpec IFU for the
radio galaxy TN J1338-1942 at z=4.1, one of the most luminous galaxies in the
early Universe with powerful extended radio jets. Previous observations showed
evidence for strong, large-scale outflows on the basis of its large ( 150 kpc)
halo detected in Ly-alpha, and high velocity [O II] emission features detected
in ground-based IFU data. Our NIRSpec/IFU observations spatially resolve the
emission line properties across the host galaxy in great detail. We find at
least five concentrations of line emission, coinciding with discrete continuum
features previously detected in imaging from HST and JWST, over an extent of
2” ( 15 kpc). The spectral diagnostics enabled by NIRSpec unambiguously trace
the activity of the obscured AGN plus interaction between the interstellar
medium and the radio jet as the dominant mechanisms for the ionization state
and kinematics of the gas in the system. A secondary region of very high
ionization lies at roughly 5 kpc distance from the nucleus, and within the
context of an expanding cocoon enveloping the radio lobe, this may be explained
by strong shock-ionization of the entrained gas. However, it could also signal
the presence of a second obscured AGN, which may also offer an explanation for
an intriguing outflow feature seen perpendicular to the radio axis. The
presence of a dual SMBH system in this galaxy would support that large galaxies
in the early Universe quickly accumulated their mass through the merging of
smaller units (each with their own SMBH), at the centers of large
overdensities. The inferred black hole mass to stellar mass ratio of 0.01-0.1
for TNJ1338 points to a more rapid assembly of black holes compared to the
stellar mass of galaxies at high redshifts, consistent with other recent
observations.
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