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Journal Articles The Astrophysical Journal Year : 2020

## PHANGS CO Kinematics: Disk Orientations and Rotation Curves at 150 pc Resolution

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Yoon-Hyun Ryu
• Function : Author
Andrzej Udalski
• Function : Author
Jennifer C. Yee
• Function : Author
Matthew T. Penny
• Function : Author
Weicheng Zang
• Function : Author
Michael D. Albrow
• Function : Author
Sun-Ju Chung
• Function : Author
Andrew Gould
Cheongho Han
• Function : Author
Kyu-Ha Hwang
• Function : Author
Youn Kil Jung
• Function : Author
In-Gu Shin
• Function : Author
Yossi Shvartzvald
• Function : Author
Sang-Mok Cha
• Function : Author
Dong-Jin Kim
• Function : Author
Hyoun-Woo Kim
• Function : Author
Seung-Lee Kim
• Function : Author
Chung-Uk Lee
• Function : Author
Dong-Joo Lee
• Function : Author
Yongseok Lee
• Function : Author
Byeong-Gon Park
• Function : Author
Richard W. Pogge
• Function : Author
Przemek Mróz
• Function : Author
Michał K. Szymański
• Function : Author
Jan Skowron
• Function : Author
Igor Soszyński
• Function : Author
Paweł Pietrukowicz
• Function : Author
Szymon Kozłowski
• Function : Author
Krzysztof Ulaczyk
• Function : Author
Krzysztof A. Rybicki
• Function : Author
Patryk Iwanek
• Function : Author
Marcin Wrona
• Function : Author
Shude Mao
• Function : Author
Wei Zhu
• Function : Author
Tianshu Wang
• Function : Author

#### Abstract

We 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.

### Dates and versions

insu-03673120 , version 1 (19-05-2022)

### Identifiers

• HAL Id : insu-03673120 , version 1
• ARXIV :
• BIBCODE :
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### Cite

Yoon-Hyun Ryu, Andrzej Udalski, Jennifer C. Yee, Matthew T. Penny, Weicheng Zang, et al.. PHANGS CO Kinematics: Disk Orientations and Rotation Curves at 150 pc Resolution. The Astrophysical Journal, 2020, ⟨10.3847/1538-4357/ab9953⟩. ⟨insu-03673120⟩

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