Simulated host galaxy analogs of high-z quasars observed with JWST
arxiv(2024)
摘要
The hosts of two low-luminosity high-z quasars, J2255+0251 and J2236+0032,
were recently detected using JWST's NIRCam instrument. These represent the
first high-z quasar host galaxy stellar detections and open a new window into
studying high-z quasars. We examine the implications of the measured properties
of J2255+0251 and J2236+0032 within the context of the hydrodynamic simulation
BlueTides at z = 6.5. We find that these observed quasars fall on the BlueTides
stellar to black hole mass relation and have similar luminosities to the
brightest simulated quasars. We predict their star formation rates, estimating
approximately 10^2-3 M_⊙/ yr for both quasar hosts. J2255+0251
and J2236+0032's host galaxy radii also fall within estimates of the radii of
the simulated host galaxies of similar luminosity quasars. We generate mock
JWST NIRCam images of analogs to the observed quasars within BlueTides and
perform a point source removal to illustrate both a qualitative and
quantitative comparison of the measured and simulated radii and magnitudes. The
quasar subtraction works well for similar luminosity quasars, and the recovered
host images are consistent with what was observed for J2255+0251 and
J2236+0032, further supporting the success of those observations. We also use
our mock imaging pipeline to make predictions for the detection of J2255+0251
and J2236+0032's hosts in upcoming JWST observations. We anticipate that the
simulation analogs of future high-z quasar host discoveries will allow us to
make accurate predictions of their properties beyond the capabilities of JWST.
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