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Dynamical Equilibrium in the Molecular ISM in 28 Nearby Star-forming Galaxies by Jiayi Sun (孙嘉懿); Adam K. Leroy; Eve C. Ostriker; Annie Hughes; Erik Rosolowsky; Andreas Schruba; Eva Schinnerer; Guillermo A. Blanc; Christopher Faesi; J. M. Diederik Kruijssen; Sharon Meidt; Dyas Utomo; Frank Bigiel; Alberto D. Bolatto; Mélanie Chevance; I-Da Chiang (江宜達); Daniel Dale; Eric Emsellem; Simon C. O. Glover; Kathryn Grasha; Jonathan Henshaw; Cinthya N. Herrera; Maria Jesus Jimenez-Donaire; Janice C. Lee; Jérôme Pety; Miguel Querejeta; Toshiki Saito; Karin Sandstrom; Antonio Usero is a Physics and Astronomy article available to read on EtoBox.

What is Dynamical Equilibrium in the Molecular ISM in 28 Nearby Star-forming Galaxies about?

We compare the observed turbulent pressure in molecular gas, P turb , to the required pressure for the interstellar gas to stay in equilibrium in the gravitational potential of a galaxy, P DE . To do this, we combine arcsecond resolution CO data from PHANGS-ALMA with multiwavelength data that trace the atomic gas, stellar structure, and star formation rate (SFR) for 28 nearby star-forming galaxies. We find that P turb correlates with-but almost always exceeds-the estimated P DE on kiloparsec scales. This indicates that the molecular gas is overpressurized relative to the large-scale environment. We show that this overpressurization can be explained by the clumpy nature of molecular gas; a revised estimate of P DE on cloud scales, which accounts for molecular gas self-gravity, external gravity, and ambient pressure, agrees well with the observed P turb in galaxy disks. We also find that molecular gas with cloud-scale » - 3 in our sample is more likely to be self-gravitating, whereas gas at lower pressure it appears more influenced by ambient pressure and/or external gravity. Furthermore, we show that the ratio between P turb and the observed SFR surface density, S SFR , is compatibl

Who reads Dynamical Equilibrium in the Molecular ISM in 28 Nearby Star-forming Galaxies?

Author

Jiayi Sun (孙嘉懿); Adam K. Leroy; Eve C. Ostriker; Annie Hughes; Erik Rosolowsky; Andreas Schruba; Eva Schinnerer; Guillermo A. Blanc; Christopher Faesi; J. M. Diederik Kruijssen; Sharon Meidt; Dyas Utomo; Frank Bigiel; Alberto D. Bolatto; Mélanie Chevance; I-Da Chiang (江宜達); Daniel Dale; Eric Emsellem; Simon C. O. Glover; Kathryn Grasha; Jonathan Henshaw; Cinthya N. Herrera; Maria Jesus Jimenez-Donaire; Janice C. Lee; Jérôme Pety; Miguel Querejeta; Toshiki Saito; Karin Sandstrom; Antonio Usero

Publisher

University of Chicago Press; American Astronomical Society; Institute of Physics Publishing; IOP Publishing; Oxford University Press (OUP) (ISSN 0004-637X)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)