Cloud-scale Molecular Gas Properties in 15 Nearby Galaxies
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Sun, Jiayi; Leroy, Adam K.; Schruba, Andreas; Rosolowsky, Erik W.; Hughes, Annie; Kruijssen, J. M. Diederik; Meidt, Sharon E.; Schinnerer, Eva; Blanc, Guillermo A.; Bigiel, Frank; Bolatto, Alberto; Groves, Brent Allan
Description
We measure the velocity dispersion, σ, and surface density, Σ, of the molecular gas in nearby galaxies from CO spectral line cubes with spatial resolution 45–120 pc, matched to the size of individual giant molecular clouds. Combining 11 galaxies from the PHANGS-ALMA survey with four targets from the literature, we characterize ~30,000 independent sightlines where CO is detected at good significance. Σ and σ show a strong positive correlation, with the best-fit power-law slope close to the...[Show more]
dc.contributor.author | Sun, Jiayi | |
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dc.contributor.author | Leroy, Adam K. | |
dc.contributor.author | Schruba, Andreas | |
dc.contributor.author | Rosolowsky, Erik W. | |
dc.contributor.author | Hughes, Annie | |
dc.contributor.author | Kruijssen, J. M. Diederik | |
dc.contributor.author | Meidt, Sharon E. | |
dc.contributor.author | Schinnerer, Eva | |
dc.contributor.author | Blanc, Guillermo A. | |
dc.contributor.author | Bigiel, Frank | |
dc.contributor.author | Bolatto, Alberto | |
dc.contributor.author | Groves, Brent Allan | |
dc.date.accessioned | 2019-09-25T06:35:33Z | |
dc.date.available | 2019-09-25T06:35:33Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/171657 | |
dc.description.abstract | We measure the velocity dispersion, σ, and surface density, Σ, of the molecular gas in nearby galaxies from CO spectral line cubes with spatial resolution 45–120 pc, matched to the size of individual giant molecular clouds. Combining 11 galaxies from the PHANGS-ALMA survey with four targets from the literature, we characterize ~30,000 independent sightlines where CO is detected at good significance. Σ and σ show a strong positive correlation, with the best-fit power-law slope close to the expected value for resolved, self-gravitating clouds. This indicates only a weak variation in the virial parameter α vir ∝ σ 2/Σ, which is ~1.5–3.0 for most galaxies. We do, however, observe enormous variation in the internal turbulent pressure P turb ∝ Σσ 2, which spans ~5 dex across our sample. We find Σ, σ, and P turb to be systematically larger in more massive galaxies. The same quantities appear enhanced in the central kiloparsec of strongly barred galaxies relative to their disks. Based on sensitive maps of M31 and M33, the slope of the σ–Σ relation flattens at Σ lesssim 10 M ⊙ pc−2, leading to high σ for a given Σ and high apparent α vir. This echoes results found in the Milky Way and likely originates from a combination of lower beam-filling factors and a stronger influence of local environment on the dynamical state of molecular gas in the low-density regime. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | IOP Publishing | |
dc.rights | © 2018. The American Astronomical Society | |
dc.source | The Astrophysical Journal | |
dc.title | Cloud-scale Molecular Gas Properties in 15 Nearby Galaxies | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 860 | |
dc.date.issued | 2018 | |
local.identifier.absfor | 020103 - Cosmology and Extragalactic Astronomy | |
local.identifier.ariespublication | a383154xPUB10206 | |
local.publisher.url | https://aas.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Sun, Jiayi, Department of Astronomy | |
local.contributor.affiliation | Leroy, Adam K., The Ohio State University | |
local.contributor.affiliation | Schruba, Andreas, Max-Planck-Institut für extraterrestrische Physik | |
local.contributor.affiliation | Rosolowsky, Erik W., University of Alberta | |
local.contributor.affiliation | Hughes, Annie, CNRS | |
local.contributor.affiliation | Kruijssen, J. M. Diederik, Zentrum fur Astronomie der Universit ¨ at Heidelberg | |
local.contributor.affiliation | Meidt, Sharon E., Max Planck Institut fur Astronomie | |
local.contributor.affiliation | Schinnerer, Eva, Max Planck Institut fur Astronomie | |
local.contributor.affiliation | Blanc, Guillermo A., Observatories of the Carnegie Institution for Science | |
local.contributor.affiliation | Bigiel, Frank, Zentrum für Astronomie der Universität Heidelberg | |
local.contributor.affiliation | Bolatto, Alberto, University of Maryland | |
local.contributor.affiliation | Groves, Brent Allan, College of Science, ANU | |
local.bibliographicCitation.issue | 2 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 39 | |
local.identifier.doi | 10.3847/1538-4357/aac326 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2019-04-21T08:21:00Z | |
local.identifier.scopusID | 2-s2.0-85049189896 | |
dcterms.accessRights | Open Access | |
dc.provenance | http://sherpa.ac.uk/romeo/issn/0004-637X/..."Publisher's version/PDF may be used on any website or authors' institutional repository" from SHERPA/RoMEO site (as at 25/09/19). | |
Collections | ANU Research Publications |
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