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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2020

Measuring the mixing scale of the ISM within nearby spiral galaxies

Kathryn Kreckel
  • Function : Author
I. -Ting Ho
  • Function : Author
Guillermo A. Blanc
  • Function : Author
Simon C. O. Glover
  • Function : Author
Brent Groves
  • Function : Author
Erik Rosolowsky
  • Function : Author
Frank Bigiel
  • Function : Author
Médéric Boquíen
  • Function : Author
Mélanie Chevance
  • Function : Author
Daniel A. Dale
  • Function : Author
Sinan Deger
  • Function : Author
Kathryn Grasha
  • Function : Author
Jenny J. Kim
  • Function : Author
Ralf S. Klessen
  • Function : Author
J. M. Diederik Kruijssen
  • Function : Author
Janice C. Lee
  • Function : Author
Adam K. Leroy
  • Function : Author
Daizhong Liu
  • Function : Author
Rebecca Mcelroy
  • Function : Author
Sharon E. Meidt
  • Function : Author
Ismael Pessa
  • Function : Author
Patricia Sanchez-Blazquez
  • Function : Author
Karin Sandstrom
  • Function : Author
Francesco Santoro
  • Function : Author
Fabian Scheuermann
  • Function : Author
Eva Schinnerer
  • Function : Author
Andreas Schruba
  • Function : Author
Dyas Utomo
  • Function : Author
Elizabeth J. Watkins
  • Function : Author
Thomas G. Williams
  • Function : Author

Abstract

The 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.
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Dates and versions

insu-03711452 , version 1 (01-07-2022)

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Kathryn Kreckel, I. -Ting Ho, Guillermo A. Blanc, Simon C. O. Glover, Brent Groves, et al.. Measuring the mixing scale of the ISM within nearby spiral galaxies. Monthly Notices of the Royal Astronomical Society, 2020, 499, pp.193-209. ⟨10.1093/mnras/staa2743⟩. ⟨insu-03711452⟩
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