Kavli Affiliate: John D. Silverman
| First 5 Authors: Camryn L. Phillips, Camryn L. Phillips, , ,
| Summary:
We present an analysis of the rest frame optical JWST NIRSpec Fixed Slit
spectra of extended host galaxy emission in 12 quasars from the Subaru High-z
Exploration of Low-Luminosity Quasars (SHELLQs) sample at redshifts 6.0 < z <
6.4. The spatial point spread function is modeled primarily by a sum of two
Gaussians as a function of wavelength and is used to fit and subtract the
quasar from the 2D spectra, leaving only extended galaxy emission which we
analyze. Ten of 12 systems show spatially extended line emission and five of 12
systems show an extended stellar continuum. From the extended [OIII]5008
emission line, we measure a 132 $pm$ 19 km/s ionized outflow in one system
and 52 $pm$ 12 km/s rotation, suggesting a coherent disk, in another. From
the extended narrow H$alpha$ emission, which we hypothesize is ionized by
star-forming regions rather than the quasar, we measure star formation rates
ranging from $sim$ 7 to 111 M$_odot$/yr, the majority of which are
consistent with the star-forming main sequence at z $approx$ 6. The
positions of our host galaxies on the log10[OIII]5008/H$beta$ vs.
log10[NII]6584/H$alpha$ (R3N2) Baldwin-Phillips-Terlevich (BPT) diagram
indicate ionization rates typical of AGN activity in the low-redshift universe,
but are consistent with the placement of similar z $approx$ 6 quasar host
galaxies, suggesting that the R3N2 line ratios cannot distinguish AGN and
star-formation powered line emission at high redshifts. We conclude from the
consistency between our quasar host sample with z $sim$ 6 galaxies that the
presence of a low-luminosity AGN causes little significant change in the
properties of galaxies at z $approx$ 6 on 10 Myr timescales.
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