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More than star formation: High-J CO SLEDs of high-z galaxies

Published online by Cambridge University Press:  04 June 2020

Chelsea E. Sharon
Affiliation:
Yale-NUS College, Singapore, 138527, Singapore email: chelsea.sharon@yale-nus.edu.sg
Reni Chng
Affiliation:
Yale-NUS College, Singapore, 138527, Singapore email: chelsea.sharon@yale-nus.edu.sg
Kebron K. Gurara
Affiliation:
Yale-NUS College, Singapore, 138527, Singapore email: chelsea.sharon@yale-nus.edu.sg
Axel Weiß
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69 D-53121 Bonn, Germany
Jeremy Darling
Affiliation:
Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0389, USA
Dominik Riechers
Affiliation:
Department of Astronomy, Cornell University, Ithaca, NY14853, USA
Carl Ferkinhoff
Affiliation:
Physics Department, Winona State University, Winona, MN55987, USA
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Abstract

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Theoretical work suggests that AGNs play an important role in quenching star formation in massive galaxies. In addition to molecular outflows observed in the local universe, emission from very high-J CO rotational transitions have been a key piece of evidence for AGN directly affecting the molecular gas reservoirs that fuel star formation. However, very few observations exist of CO rotational lines past the peak of the CO spectral line energy distribution (SLED) for galaxies in the early universe. Here we present new ALMA observations of high-J CO rotational lines (from CO(5–4) to CO(16–15)) in six z > 2 IR-bright systems, including several sources not known to contain a strong AGN for comparison. We detect significant amounts of high-excitation CO emission that suggests the presence of energy sources beyond UV-heating.

Type
Contributed Papers
Copyright
© International Astronomical Union 2020

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