Can I read The ALMaQUEST survey. VIII. What causes the velocity discrepancy between CO and H$\alpha$ rotation curves in galaxies? on EtoBox?

The ALMaQUEST survey. VIII. What causes the velocity discrepancy between CO and H$\alpha$ rotation curves in galaxies? by Su, Yung-Chau; Lin, Lihwai; Pan, Hsi-An; Cobá, Carlos López; Hsieh, Bau-Ching; Sánchez, Sebastián F.; Thorp, Mallory D.; Bureau, Martin; Ellison, Sara L. is a scholarly article available to read on EtoBox.

What is The ALMaQUEST survey. VIII. What causes the velocity discrepancy between CO and H$\alpha$ rotation curves in galaxies? about?

We compare the CO(1-0) and H$\alpha$ kinematics in 34 nearby galaxies, selected from the ALMaQUEST and EDGE-CALIFA surveys. We use 3-D Barolo, a 3D tilted ring model, to derive the CO and H$\alpha$ rotation curves. Before comparing rotation curves in the 34 nearby galaxies, we found systematics between the MaNGA and the CALIFA data using eight MaNGA-CALIFA overlapping galaxies. We assume the rotation curves based on the MaNGA data are accurate and made the corresponding correction to the CALIFA data. Our result shows that $\sim$56% (19/34) of our galaxies present slower H$\alpha$ rotation curves compared to the CO rotation curves, with a median value of 6.5 km/s. The remaining galaxies (15/34) show consistent CO-H$\alpha$ rotation velocity within uncertainties. As a result, the Ha rotation may underestimate the total dynamical mass by ~6% for a circular velocity of 200 km/s (the median value in our sample). Furthermore, the velocity difference between the CO and H$\alpha$ rotation velocity is found to correlate with the velocity dispersion difference between CO and H$\alpha$, suggesting that the gas pressure plays a role in the velocity discrepancy. After incorporating the effect o

Author

Su, Yung-Chau; Lin, Lihwai; Pan, Hsi-An; Cobá, Carlos López; Hsieh, Bau-Ching; Sánchez, Sebastián F.; Thorp, Mallory D.; Bureau, Martin; Ellison, Sara L.

Published

2022

Language

EN