Neutral carbon and highly excited CO in a massive star-forming main sequence 
galaxy at z = 2.2

Brisbin, Drew; Aravena, Manuel; Daddi, Emanuele; Dannerbauer, Helmut; Decarli, Roberto; González-López, Jorge; Riechers, Dominik; Wagg, Jeff

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Neutral carbon and highly excited CO in a massive star-forming main sequence galaxy at z = 2.2

MPS-Authors

Brisbin, Drew
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Aravena, Manuel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Daddi, Emanuele
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dannerbauer, Helmut
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Decarli, Roberto
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

González-López, Jorge
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Riechers, Dominik
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wagg, Jeff
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019A&A...628A.104B
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Citation

Brisbin, D., Aravena, M., Daddi, E., Dannerbauer, H., Decarli, R., González-López, J., et al. (2019). Neutral carbon and highly excited CO in a massive star-forming main sequence galaxy at z = 2.2. Astronomy and Astrophysics, 628.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D1B6-1

Abstract

We used the Plateau De Bure Interferometer to observe multiple CO and neutral carbon transitions in a z = 2.2 main sequence disk galaxy, BX610. Our observation of CO(7-6), CO(4-3), and both far-infrared (FIR) [CI] lines complements previous observations of Hα and low-J CO, and reveals a galaxy that is vigorously forming stars with UV fields (Log(GG₀^-1) ≲ 3.25); although less vigorously than local ultra-luminous infrared galaxies or most starbursting submillimeter galaxies in the early universe. Our observations allow new independent estimates of the cold gas mass which indicate M_gas ̃ 2 × 10¹¹ M_☉, and suggest a modestly larger α_CO value of ̃8.2. The corresponding gas depletion timescale is ̃1.5 Gyr. In addition to gas of modest density (Log(n cm³) ≲ 3) heated by star formation, BX610 shows evidence for a significant second gas component responsible for the strong high-J CO emission. This second component might either be a high- density molecular gas component heated by star formation in a typical photodissociation region, or could be molecular gas excited by low- velocity C shocks. The CO(7-6)-to-FIR luminosity ratio we observe is significantly higher than typical star-forming galaxies and suggests that CO(7-6) is not a reliable star-formation tracer in this galaxy. The reduced spectra are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/628/A104">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/628/A104</A>