The KMOS3D Survey: Rotating Compact Star-forming Galaxies and the Decomposition 
of Integrated Line Widths

Wisnioski, E.; Mendel, J. T.; Förster Schreiber, N. M.; Genzel, R.; Wilman, D.; Wuyts, S.; Belli, S.; Beifiori, A.; Bender, R.; Brammer, G.; Chan, J.; Davies, R. I.; Davies, R. L.; Fabricius, M.; Fossati, M.; Galametz, A.; Lang, P.; Lutz, D.; Nelson, E. J.; Momcheva, I.; Rosario, D.; Saglia, R.; Tacconi, L. J.; Tadaki, K.; Übler, H.; van Dokkum, P. G.

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Journal Article

The KMOS^3D Survey: Rotating Compact Star-forming Galaxies and the Decomposition of Integrated Line Widths

MPS-Authors

Wisnioski, E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mendel, J. T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Förster Schreiber, N. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Genzel, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wilman, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wuyts, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Belli, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Bender, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brammer, G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chan, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Davies, R. I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Davies, R. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fabricius, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fossati, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Lang, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lutz, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nelson, E. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Momcheva, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rosario, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Saglia, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tacconi, L. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tadaki, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Übler, H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

van Dokkum, P. G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018ApJ...855...97W
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Citation

Wisnioski, E., Mendel, J. T., Förster Schreiber, N. M., Genzel, R., Wilman, D., Wuyts, S., et al. (2018). The KMOS^3D Survey: Rotating Compact Star-forming Galaxies and the Decomposition of Integrated Line Widths. The Astrophysical Journal, 855.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CA40-F

Abstract

Using integral field spectroscopy, we investigate the kinematic properties of 35 massive centrally dense and compact star-forming galaxies (SFGs; {log}{\overline{M}}_*[{M}_☉]=11.1, {log}({{{Σ }}}_1{kpc}[{M}_☉ {kpc}}^-2])> 9.5, {log}({M}_*/{r}_e^1.5[{M}_☉ {kpc}}^-1.5])> 10.3) at z ̃ 0.7-3.7 within the KMOS^3D survey. We spatially resolve 23 compact SFGs and find that the majority are dominated by rotational motions with velocities ranging from 95 to 500 km s^-1. The range of rotation velocities is reflected in a similar range of integrated Hα line widths, 75-400 km s^-1, consistent with the kinematic properties of mass-matched extended galaxies from the full KMOS^3D sample. The fraction of compact SFGs that are classified as “rotation-dominated” or “disklike” also mirrors the fractions of the full KMOS^3D sample. We show that integrated line-of-sight gas velocity dispersions from KMOS^3D are best approximated by a linear combination of their rotation and turbulent velocities with a lesser but still significant contribution from galactic-scale winds. The Hα exponential disk sizes of compact SFGs are, on average, 2.5 ± 0.2 kpc, 1-2× the continuum sizes, in agreement with previous work. The compact SFGs have a 1.4× higher active galactic nucleus (AGN) incidence than the full KMOS^3D sample at fixed stellar mass with an average AGN fraction of 76%. Given their high and centrally concentrated stellar masses, as well as stellar-to-dynamical mass ratios close to unity, the compact SFGs are likely to have low molecular gas fractions and to quench on a short timescale unless replenished with inflowing gas. The rotation in these compact systems suggests that their direct descendants are rotating passive galaxies. Based on observations obtained at the Very Large Telescope (VLT) of the European Southern Observatory (ESO), Paranal, Chile (ESO program IDs 092A-0091, 093.A-0079, 094.A-0217, 095.A-0047, 096.A-0025, 097.A-0028, and 098.A-0045).