Feeding the spider with carbon -- [CII] emission from the circum
  galactic medium and active galactic nucleus
  We present the detection of [CII] 158um emission from the Spiderweb galaxy at
z=2.1612 using the Atacama Pathfinder EXperiment. The line profile splits into
an active galactic nucleus (AGN) and circum galacic medium (CGM) component
previously identified in CO and [CI]. We find that these individual [CII]
components are consistent in terms of CO and far-IR luminosity ratios with the
populations of other z>~1 AGN and dusty star-forming galaxies. The CGM
component dominates the [CII] emission in the 10" APEX beam. Although we do not
have spatially resolved data, the close correspondence of the velocity profile
with the CO(1-0) detected only on scales of tens of kiloparsecs in CO(1-0)
suggests that the [CII] emission is similarly extended, reminiscent of [CII]
halos recently found around z>5 galaxies. Comparing the first four ionization
states of carbon, we find that the atomic [CI] emission is dominant, which
increases its reliability as a molecular mass tracer. Our [CII] detection at
601.8 GHz also demonstrates the feasibility to extend the frequency range of
ALMA Band 9 beyond the original specifications.
