Measuring the mixing scale of the ISM within nearby spiral galaxies
Author
dc.contributor.author
Kreckel, Kathryn
Author
dc.contributor.author
Ho, I-Ting
Author
dc.contributor.author
Blanc Mendiberri, Guillermo
Author
dc.contributor.author
Glover, Simon C.O.
Author
dc.contributor.author
Groves, Brent
Author
dc.contributor.author
Rosolowsky, Erik
Author
dc.contributor.author
Bigiel, Frank
Author
dc.contributor.author
Boquien, Mederic
Author
dc.contributor.author
Chevance, Melanie
Author
dc.contributor.author
Dale, Daniel A.
Author
dc.contributor.author
Deger, Sinan
Author
dc.contributor.author
Emsellem, Eric
Author
dc.contributor.author
Grasha, Kathryn
Author
dc.contributor.author
Kim, Jenny J.
Author
dc.contributor.author
Klessen, Ralf S.
Author
dc.contributor.author
Kruijssen, J. M. Diederik
Author
dc.contributor.author
Lee, Janice C.
Author
dc.contributor.author
Leroy, Adam K.
Author
dc.contributor.author
Liu, Daizhong
Author
dc.contributor.author
McElroy, Rebecca
Author
dc.contributor.author
Meidt, Sharon E.
Author
dc.contributor.author
Pessa, Ismael
Author
dc.contributor.author
Sánchez Blázquez, Patricia
Author
dc.contributor.author
Sandstrom, Karin
Author
dc.contributor.author
Santoro, Francesco
Author
dc.contributor.author
Scheuermann, Fabian
Author
dc.contributor.author
Schinnerer, Eva
Author
dc.contributor.author
Schruba, Andreas
Author
dc.contributor.author
Utomo, Dyas
Author
dc.contributor.author
Watkins, Elizabeth J.
Author
dc.contributor.author
Williams, Thomas G.
Admission date
dc.date.accessioned
2021-04-29T21:21:40Z
Available date
dc.date.available
2021-04-29T21:21:40Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
MNRAS 499, 193–209 (2020)
es_ES
Identifier
dc.identifier.other
10.1093/mnras/staa2743
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/179359
Abstract
dc.description.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 HII 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, Delta(O/H), in order to quantify the homogeneity of the metal distribution and to measure the mixing scale over which HII region metallicities are correlated. We observe low (0.03-0.05 dex) scatter in Delta(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 less than or similar to 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 HII 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.
es_ES
Patrocinador
dc.description.sponsorship
German Research Foundation (DFG)
KR4598/2-1
DFG via SFB 881 'The Milky Way System'
138713538
Heidelberg cluster of excellence 'STRUCTURES: A unifying approach to emergent phenomena in the physical world, mathematics, and complex data' by the German Excellence Strategy
EXC 2181-390900948
European Research Council (ERC)
European Commission
855130
Natural Sciences and Engineering Research Council of Canada (NSERC)
RGPIN-2017-03987
European Research Council (ERC)
726384/Empire
German Research Foundation (DFG)
KR4801/1-1
German Research Foundation (DFG)
KR4801/2-1
ERC under European Union
714907
694343
European Organisation for Astronomical Research in the Southern Hemisphere
094.C-0623(A)
098.C-0484(A)
1100.B-0651(A)
1100.B-0651(B)