Lang, PMeidt, Sharon E.Rosolowsky, ErikNofech, JosephSchinnerer, EvaLeroy, A. K.Emsellem, EricPessa, IsmaelGlover, Simon C OGroves, BrentHughes, Annie2022-07-212022-07-210004-637Xhttp://hdl.handle.net/1885/269841We present kinematic orientations and high-resolution (150 pc) rotation curves for 67 main-sequence star-forming galaxies surveyed in CO (2-1) emission by PHANGS-ALMA. Our measurements are based on the application of a new fitting method tailored to CO velocity fields. Our approach identifies an optimal global orientation as a way to reduce the impact of nonaxisymmetric (bar and spiral) features and the uneven spatial sampling characteristic of CO emission in the inner regions of nearby galaxies. The method performs especially well when applied to the large number of independent lines of sight contained in the PHANGS CO velocity fields mapped at 1'' resolution. The high-resolution rotation curves fitted to these data are sensitive probes of mass distribution in the inner regions of these galaxies. We use the inner slope as well as the amplitude of our fitted rotation curves to demonstrate that CO is a reliable global dynamical mass tracer. From the consistency between photometric orientations from the literature and kinematic orientations determined with our method, we infer that the shapes of stellar disks in the mass range of log(${M}_{\star }({M}_{\odot })$) = 9.0-10.9 probed by our sample are very close to circular and have uniform thickness.P.L., E.S., C.F., and D.L. acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 694343). E.R. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), funding reference number RGPIN-2017- 03987. J.M.D.K. and M.C. gratefully acknowledge funding from the Deutsche Forschungsgemeinschaft (DFG) through an Emmy Noether Research Group (grant No. KR4801/1-1) and the DFG Sachbeihilfe (grant No. KR4801/2-1). J.M.D.K. gratefully acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program via the ERC Starting Grant MUSTANG (grant agreement No. 714907). S.C.O.G. acknowledges support from the Deutsche Forschungsgemeinschaft via SFB 881 “The Milky Way System” (Project-ID 138713538; subprojects B1, B2, and B8) and via Germany’s Excellence Strategy EXC 2181/1-390900948 (the Heidelberg STRUCTURES Excellence Cluster). C.H., A.H., and J.P. acknowledge support from the Programme National “Physique et Chimie du Milieu Interstellaire” (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES, and from the Programme National Cosmology and Galaxies (PNCG) of CNRS/INSU with INP and IN2P3, co-funded by CEA and CNES. J.P. and F.B. acknowledge funding from the European Union’s Horizon 2020 research and innovation program (grant agreement No. 726384)application/pdfen-AU© 2020 The American Astronomical SocietyGalaxy dynamicsInterstellar mediumMolecular clouds202010.3847/1538-4357/ab99532021-08-01