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.
1D spectrum is also available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/658/L2- Publication:
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Astronomy and Astrophysics
- Pub Date:
- February 2022
- DOI:
- 10.1051/0004-6361/202141853
- arXiv:
- arXiv:2201.05064
- Bibcode:
- 2022A&A...658L...2D
- Keywords:
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- galaxies: high-redshift;
- galaxies: ISM;
- submillimeter: ISM;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 4 pages, 2 figures, accepted by Astronomy &