Kavli Affiliate: Luis C. Ho
| First 5 Authors: Thomas M. Cornish, Julie L. Wardlow, Thomas Greve, Scott Chapman, Chian-Chou Chen
| Summary:
Measuring the environments of massive galaxies at high redshift is crucial to
understanding galaxy evolution and the conditions that gave rise to the
distribution of matter we see in the Universe today. While high-$z$ radio
galaxies (H$z$RGs) and quasars tend to reside in protocluster-like systems, the
environments of their radio-quiet counterparts are relatively unexplored,
particularly in the submillimetre, which traces dust-obscured star formation.
In this study we search for 850 $mu$m-selected submillimetre galaxies in the
environments of massive ($M_{star} > 10^{11} M_{odot}$), radio-quiet ($L_{500
{rm MHz}} lesssim 10^{25}$ W Hz$^{-1}$) galaxies at $z sim 1text{–}3$ in
COSMOS. By constructing number counts in circular regions of radius 1–6 arcmin
and comparing with blank-field measurements, we find no significant
overdensities of SMGs around massive radio-quiet galaxies at any of these
scales, despite being sensitive down to overdensities of $delta sim 0.4$. To
probe deeper than the catalogue we also examine the distribution of peaks in
the SCUBA-2 SNR map, which reveals only tentative signs of any difference in
the SMG densities of the radio-quiet galaxy environments compared to the blank
field, and only on smaller scales (1$^{prime}$ radii, corresponding to
$sim0.5$ Mpc) and higher SNR thresholds. We conclude that massive, radio-quiet
galaxies at cosmic noon are typically in environments with $deltalesssim0.4$,
which are either consistent with the blank field or contain only weak
overdensities spanning sub-Mpc scales. The contrast between our results and
studies of H$z$RGs with similar stellar masses and redshifts implies an
intrinsic link between the wide-field environment and radio AGN luminosity at
high redshift.
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