Measuring the mixing scale of the ISM within nearby spiral galaxies
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 gala...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
15 September 2020
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2020, Jahrgang: 499, Heft: 1, Pages: 193-209 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/staa2743 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/staa2743
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| Verfasserangaben: | Kathryn Kreckel, I-Ting Ho, Guillermo A. Blanc, Simon C.O. Glover, Brent Groves, Erik Rosolowsky, Frank Bigiel, Médéric Boquíen, Mélanie Chevance, Daniel A. Dale, Sinan Deger, Eric Emsellem, Kathryn Grasha, Jenny J. Kim, Ralf S. Klessen, J.M. Diederik Kruijssen, Janice C. Lee, Adam K. Leroy, Daizhong Liu, Rebecca McElroy, Sharon E. Meidt, Ismael Pessa, Patricia Sanchez-Blazquez, Karin Sandstrom, Francesco Santoro, Fabian Scheuermann, Eva Schinnerer, Andreas Schruba, Dyas Utomo, Elizabeth J. Watkins and Thomas G. Williams |
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| 245 | 1 | 0 | |a Measuring the mixing scale of the ISM within nearby spiral galaxies |c Kathryn Kreckel, I-Ting Ho, Guillermo A. Blanc, Simon C.O. Glover, Brent Groves, Erik Rosolowsky, Frank Bigiel, Médéric Boquíen, Mélanie Chevance, Daniel A. Dale, Sinan Deger, Eric Emsellem, Kathryn Grasha, Jenny J. Kim, Ralf S. Klessen, J.M. Diederik Kruijssen, Janice C. Lee, Adam K. Leroy, Daizhong Liu, Rebecca McElroy, Sharon E. Meidt, Ismael Pessa, Patricia Sanchez-Blazquez, Karin Sandstrom, Francesco Santoro, Fabian Scheuermann, Eva Schinnerer, Andreas Schruba, Dyas Utomo, Elizabeth J. Watkins and Thomas G. Williams |
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| 520 | |a 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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