Measuring the mixing scale of the ISM within nearby spiral galaxies

Article


Kreckel, Kathryn, Ho, I. -Ting, Blanc, Guillermo A., Glover, Simon C. O., Groves, Brent, Rosolowsky, Erik, Bigiel, Frank, Boquíen, Médéric, Chevance, Mélanie, Dale, Daniel A., Deger, Sinan, Emsellem, Eric, Grasha, Kathryn, Kim, Jenny J., Klessen, Ralf S., Kruijssen, J. M. Diederik, Lee, Janice C., Leroy, Adam K., Liu, Daizhong, ..., Williams, Thomas G.. 2020. "Measuring the mixing scale of the ISM within nearby spiral galaxies." Monthly Notices of the Royal Astronomical Society. 499 (1), pp. 193-209. https://doi.org/10.1093/mnras/staa2743
Article Title

Measuring the mixing scale of the ISM within nearby spiral galaxies

ERA Journal ID1074
Article CategoryArticle
AuthorsKreckel, Kathryn, Ho, I. -Ting, Blanc, Guillermo A., Glover, Simon C. O., Groves, Brent, Rosolowsky, Erik, Bigiel, Frank, Boquíen, Médéric, Chevance, Mélanie, Dale, Daniel A., Deger, Sinan, Emsellem, Eric, Grasha, Kathryn, Kim, Jenny J., Klessen, Ralf S., Kruijssen, J. M. Diederik, Lee, Janice C., Leroy, Adam K., Liu, Daizhong, McElroy, Rebecca, Meidt, Sharon E., Pessa, Ismael, Sanchez-Blazquez, Patricia, Sandstrom, Karin, Santoro, Francesco, Scheuermann, Fabian, Schinnerer, Eva, Schruba, Andreas, Utomo, Dyas, Watkins, Elizabeth J. and Williams, Thomas G.
Journal TitleMonthly Notices of the Royal Astronomical Society
Journal Citation499 (1), pp. 193-209
Number of Pages193-209
Year2020
01 Nov 2020
PublisherOxford University Press
Place of PublicationUnited Kingdom
ISSN0035-8711
1365-2966
Digital Object Identifier (DOI)https://doi.org/10.1093/mnras/staa2743
Web Address (URL)https://academic.oup.com/mnras/article/499/1/193/5905731
AbstractThe spatial distribution of metals reflects, and can be used to constrain, the processes of chemical enrichment and mixing. Using PHANGS-MUSE optical integral field spectroscopy, we measure the gas-phase oxygen abundances (metallicities) across 7138 H II regions in a sample of eight nearby disc galaxies. In Paper I, we measure and report linear radial gradients in the metallicities of each galaxy, and qualitatively searched for azimuthal abundance variations. Here, we examine the 2D variation in abundances once the radial gradient is subtracted, Δ(O/H), in order to quantify the homogeneity of the metal distribution and to measure the mixing scale over which H II region metallicities are correlated. We observe low (0.03-0.05 dex) scatter in Δ(O/H) globally in all galaxies, with significantly lower (0.02-0.03 dex) scatter on small (<600 pc) spatial scales. This is consistent with the measurement uncertainties, and implies the 2D metallicity distribution is highly correlated on scales of ≲600 pc. We compute the two-point correlation function for metals in the disc in order to quantify the scale lengths associated with the observed homogeneity. This mixing scale is observed to correlate better with the local gas velocity dispersion (of both cold and ionized gas) than with the star formation rate. Selecting only H II regions with enhanced abundances relative to a linear radial gradient, we do not observe increased homogeneity on small scales. This suggests that the observed homogeneity is driven by the mixing introducing material from large scales rather than by pollution from recent and on-going star formation.
KeywordsISM: abundances ; ISM: evolution; galaxies: abundances; galaxies: ISM
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510102. Astronomical instrumentation
Public Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Byline AffiliationsHeidelberg University, Germany
Max Planck Institute for Astronomy, Germany
Carnegie Institution for Science, United States
University of Chile, Chile
University of Western Australia
University of Alberta, Canada
University of Bonn, Germany
University of Antofagasta, Chile
University of Wyoming, United States
California Institute of Technology (Caltech), United States
University of Lyon, France
Australian National University
Ohio State University, United States
School of Mathematics, Physics and Computing
University of Gent, Belgium
Autonomous University of Madrid, Spain
University of California San Diego, United States
Max Planck Institute for Extraterrestrial Physics, Germany
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