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  Dynamical equilibrium in the molecular ISM in 28 nearby star-forming galaxies

Sun, J., Leroy, A. K., Ostriker, E. C., Hughes, A., Rosolowsky, E., Schruba, A., et al. (2020). Dynamical equilibrium in the molecular ISM in 28 nearby star-forming galaxies. The Astrophysical Journal, 892(2): 148. doi:10.3847/1538-4357/ab781c.

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Sun, Jiayi, Author
Leroy, Adam K., Author
Ostriker, Eve C., Author
Hughes, Annie, Author
Rosolowsky, Erik, Author
Schruba, Andreas1, Author              
Schinnerer, Eva, Author
Blanc, Guillermo A., Author
Faesi, Christopher, Author
Kruijssen, J. M. Diederik, Author
Meidt, Sharon, Author
Utomo, Dyas, Author
Bigiel, Frank, Author
Bolatto, Alberto D., Author
Chevance, Mélanie, Author
Chiang, I-Da, Author
Dale, Daniel, Author
Emsellem, Eric, Author
Glover, Simon C. O., Author
Grasha, Kathryn, Author
Henshaw, Jonathan, AuthorHerrera, Cinthya N., AuthorJimenez-Donaire, Maria Jesus, AuthorLee, Janice C., AuthorPety, Jérôme, AuthorQuerejeta, Miguel, AuthorSaito, Toshiki, AuthorSandstrom, Karin, AuthorUsero, Antonio, Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We compare the observed turbulent pressure in molecular gas, Pturb, to the required pressure for the interstellar gas to stay in equilibrium in the gravitational potential of a galaxy, PDE. To do this, we combine arcsecond resolution CO data from PHANGS-ALMA with multi-wavelength data that traces the atomic gas, stellar structure, and star formation rate (SFR) for 28 nearby star-forming galaxies. We find that Pturb correlates with, but almost always exceeds the estimated PDE on kiloparsec scales. This indicates that the molecular gas is over-pressurized relative to the large- scale environment. We show that this over-pressurization can be explained by the clumpy nature of molecular gas; a revised estimate of PDE on cloud scales, which accounts for molecular gas self-gravity, external gravity, and ambient pressure, agrees well with the observed Pturb in galaxy disks. We also find that molecular gas with cloud-scale Pturb≈PDE≳105kBKcm−3 in our sample is more likely to be self-gravitating, whereas gas at lower pressure appears more influenced by ambient pressure and/or external gravity. Furthermore, we show that the ratio between Pturb and the observed SFR surface density, ΣSFR, is compatible with stellar feedback-driven momentum injection in most cases, while a subset of the regions may show evidence of turbulence driven by additional sources. The correlation between ΣSFR and kpc-scale PDE in galaxy disks is consistent with the expectation from self-regulated star formation models. Finally, we confirm the empirical correlation between molecular-to-atomic gas ratio and kpc-scale PDE reported in previous works.

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 Dates: 2020-04-07
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ab781c
Other: LOCALID: 3237907
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 892 (2) Sequence Number: 148 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3