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Journal Article

No Evidence for Enhanced [O III] 88 μm Emission in a z ̃ 6 Quasar Compared to Its Companion Starbursting Galaxy

MPS-Authors

Walter,  Fabian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Novak,  Mladen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Ferkinhoff,  Carl
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Venemans,  Bram
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bañados,  Eduardo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bertoldi,  Frank
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Carilli,  Chris
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fan,  Xiaohui
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Mazzucchelli,  Chiara
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Neeleman,  Marcel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rix,  Hans-Walter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Strauss,  Michael A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Uzgil,  Bade
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wang,  Ran
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJ...869L..22W
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Citation

Walter, F., Riechers, D., Novak, M., Decarli, R., Ferkinhoff, C., Venemans, B., et al. (2018). No Evidence for Enhanced [O III] 88 μm Emission in a z ̃ 6 Quasar Compared to Its Companion Starbursting Galaxy. The Astrophysical Journal, 869.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CA64-7
Abstract
We present Atacama Large Millimeter/submillimeter Array band 8 observations of the [O III] 88 μm line and the underlying thermal infrared continuum emission in the z = 6.08 quasar CFHQS J2100-1715 and its dust-obscured starburst companion galaxy (projected distance: ̃60 kpc). Each galaxy hosts dust-obscured star formation at rates >100 M ☉ yr-1, but only the quasar shows evidence for an accreting 109 M ☉ black hole. Therefore we can compare the properties of the interstellar medium in distinct galactic environments in two physically associated objects, ̃1 Gyr after the big bang. Bright [O III] 88 μm emission from ionized gas is detected in both systems; the positions and linewidths are consistent with earlier [C II] measurements, indicating that both lines trace the same gravitational potential on galactic scales. The [O III] 88 μm/far-infrared (FIR) luminosity ratios in both sources fall in the upper range observed in local luminous infrared galaxies of similar dust temperature, although the ratio of the quasar is smaller than in the companion. This suggests that gas ionization by the quasar (expected to lead to strong optical [O III] 5008 Å emission) does not dominantly determine the quasar’s FIR [O III] 88 μm luminosity. Both the inferred number of photons needed for the creation of O++ and the typical line ratios can be accounted for without invoking extreme (top-heavy) stellar initial mass functions in the starbursts of both sources.