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Journal Article

The EDGE-CALIFA Survey: Molecular and Ionized Gas Kinematics in Nearby Galaxies

MPS-Authors

Levy,  Rebecca C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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

Teuben,  Peter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sánchez,  Sebastián F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barrera-Ballesteros,  Jorge K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Blitz,  Leo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Colombo,  Dario
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

García-Benito,  Rubén
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Herrera-Camus,  Rodrigo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Husemann,  Bernd
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kalinova,  Veselina
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lan,  Tian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Leung,  Gigi Y. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mast,  Damián
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Utomo,  Dyas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

van de Ven,  Glenn
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vogel,  Stuart N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wong,  Tony
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJ...860...92L
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Citation

Levy, R. C., Bolatto, A. D., Teuben, P., Sánchez, S. F., Barrera-Ballesteros, J. K., Blitz, L., et al. (2018). The EDGE-CALIFA Survey: Molecular and Ionized Gas Kinematics in Nearby Galaxies. The Astrophysical Journal, 860.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CC8C-8
Abstract
We present a comparative study of molecular and ionized gas kinematics in nearby galaxies. These results are based on observations from the EDGE survey, which measured spatially resolved 12CO(J = 1-0) in 126 nearby galaxies. Every galaxy in EDGE has corresponding resolved ionized gas measurements from CALIFA. Using a sub-sample of 17 rotation- dominated, star-forming galaxies where precise molecular gas rotation curves could be extracted, we derive CO and Hα rotation curves using the same geometric parameters out to ≳1 R e . We find that ̃75% of our sample galaxies have smaller ionized gas rotation velocities than the molecular gas in the outer part of the rotation curve. In no case is the molecular gas rotation velocity measurably lower than that of the ionized gas. We suggest that the lower ionized gas rotation velocity can be attributed to a significant contribution from extraplanar diffuse ionized gas in a thick, turbulence-supported disk. Using observations of the Hγ transition, also available from CALIFA, we measure ionized gas velocity dispersions and find that these galaxies have sufficiently large velocity dispersions to support a thick ionized gas disk. Kinematic simulations show that a thick disk with a vertical rotation velocity gradient can reproduce the observed differences between the CO and Hα rotation velocities. Observed line ratios tracing diffuse ionized gas are elevated compared to typical values in the midplane of the Milky Way. In galaxies affected by this phenomenon, dynamical masses measured using ionized gas rotation curves will be systematically underestimated.