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Feeding the spider with carbon - [CII] emission from the circumgalactic medium and active galactic nucleus

Abstract : We present the detection of [CII] 158 μm emission from the Spiderweb galaxy at z = 2.1612 using the Atacama Pathfinder EXperiment (APEX). The line profile splits into an active galactic nucleus (AGN) and circumgalactic 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.Key words: galaxies: high-redshift / galaxies: ISM / submillimeter: ISM⋆ 1D spectrum is also available at the CDS via anonymous ftp to ( or via
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Submitted on : Monday, June 20, 2022 - 1:44:46 PM
Last modification on : Monday, June 20, 2022 - 1:44:47 PM


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Carlos de Breuck, Andreas Lundgren, Bjorn Emonts, Sthabile Kolwa, Helmut Dannerbauer, et al.. Feeding the spider with carbon - [CII] emission from the circumgalactic medium and active galactic nucleus. Astron.Astrophys., 2022, 658, pp.L2. ⟨10.1051/0004-6361/202141853⟩. ⟨hal-03547649⟩



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