The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365

I. Ting Ho; Mark Seibert; Sharon E. Meidt; Rolf Peter Kudritzki; Chiaki Kobayashi; Brent A. Groves; Lisa J. Kewley; Barry F. Madore; Jeffrey A. Rich; Eva Schinnerer; Joshua D'Agostino; Henry Poetrodjojo

doi:10.3847/1538-4357/aa8460

The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365

I. Ting Ho, Mark Seibert, Sharon E. Meidt, Rolf Peter Kudritzki, Chiaki Kobayashi, Brent A. Groves, Lisa J. Kewley, Barry F. Madore, Jeffrey A. Rich, Eva Schinnerer, Joshua D'Agostino, Henry Poetrodjojo

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Abstract

The spatial distribution of oxygen in the interstellar medium of galaxies is the key to understanding how efficiently metals that are synthesized in massive stars can be redistributed across a galaxy. We present here a case study in the nearby spiral galaxy NGC 1365 using 3D optical data obtained in the TYPHOON Program. We find systematic azimuthal variations of the H ii region oxygen abundance imprinted on a negative radial gradient. The 0.2 dex azimuthal variations occur over a wide radial range of 0.3-0.7 R ₂₅ and peak at the two spiral arms in NGC 1365. We show that the azimuthal variations can be explained by two physical processes: gas undergoes localized, sub-kiloparsec-scale self-enrichment when orbiting in the inter-arm region, and experiences efficient, kiloparsec-scale mixing-induced dilution when spiral density waves pass through. We construct a simple chemical evolution model to quantitatively test this picture and find that our toy model can reproduce the observations. This result suggests that the observed abundance variations in NGC 1365 are a snapshot of the dynamical local enrichment of oxygen modulated by spiral-driven, periodic mixing and dilution.

Original language	English
Article number	39
Journal	Astrophysical Journal
Volume	846
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa8460
Publication status	Published - 1 Sept 2017

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Ho, I. T., Seibert, M., Meidt, S. E., Kudritzki, R. P., Kobayashi, C., Groves, B. A., Kewley, L. J., Madore, B. F., Rich, J. A., Schinnerer, E., D'Agostino, J., & Poetrodjojo, H. (2017). The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365. Astrophysical Journal, 846(1), Article 39. https://doi.org/10.3847/1538-4357/aa8460

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title = "The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365",

abstract = "The spatial distribution of oxygen in the interstellar medium of galaxies is the key to understanding how efficiently metals that are synthesized in massive stars can be redistributed across a galaxy. We present here a case study in the nearby spiral galaxy NGC 1365 using 3D optical data obtained in the TYPHOON Program. We find systematic azimuthal variations of the H ii region oxygen abundance imprinted on a negative radial gradient. The 0.2 dex azimuthal variations occur over a wide radial range of 0.3-0.7 R 25 and peak at the two spiral arms in NGC 1365. We show that the azimuthal variations can be explained by two physical processes: gas undergoes localized, sub-kiloparsec-scale self-enrichment when orbiting in the inter-arm region, and experiences efficient, kiloparsec-scale mixing-induced dilution when spiral density waves pass through. We construct a simple chemical evolution model to quantitatively test this picture and find that our toy model can reproduce the observations. This result suggests that the observed abundance variations in NGC 1365 are a snapshot of the dynamical local enrichment of oxygen modulated by spiral-driven, periodic mixing and dilution.",

keywords = "galaxies: ISM, galaxies: abundances, galaxies: individual (NGC1365), galaxies: spiral",

author = "Ho, {I. Ting} and Mark Seibert and Meidt, {Sharon E.} and Kudritzki, {Rolf Peter} and Chiaki Kobayashi and Groves, {Brent A.} and Kewley, {Lisa J.} and Madore, {Barry F.} and Rich, {Jeffrey A.} and Eva Schinnerer and Joshua D'Agostino and Henry Poetrodjojo",

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doi = "10.3847/1538-4357/aa8460",

language = "English",

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TY - JOUR

T1 - The Chemical Evolution Carousel of Spiral Galaxies

T2 - Azimuthal Variations of Oxygen Abundance in NGC1365

AU - Ho, I. Ting

AU - Seibert, Mark

AU - Meidt, Sharon E.

AU - Kudritzki, Rolf Peter

AU - Kobayashi, Chiaki

AU - Groves, Brent A.

AU - Kewley, Lisa J.

AU - Madore, Barry F.

AU - Rich, Jeffrey A.

AU - Schinnerer, Eva

AU - D'Agostino, Joshua

AU - Poetrodjojo, Henry

PY - 2017/9/1

Y1 - 2017/9/1

N2 - The spatial distribution of oxygen in the interstellar medium of galaxies is the key to understanding how efficiently metals that are synthesized in massive stars can be redistributed across a galaxy. We present here a case study in the nearby spiral galaxy NGC 1365 using 3D optical data obtained in the TYPHOON Program. We find systematic azimuthal variations of the H ii region oxygen abundance imprinted on a negative radial gradient. The 0.2 dex azimuthal variations occur over a wide radial range of 0.3-0.7 R 25 and peak at the two spiral arms in NGC 1365. We show that the azimuthal variations can be explained by two physical processes: gas undergoes localized, sub-kiloparsec-scale self-enrichment when orbiting in the inter-arm region, and experiences efficient, kiloparsec-scale mixing-induced dilution when spiral density waves pass through. We construct a simple chemical evolution model to quantitatively test this picture and find that our toy model can reproduce the observations. This result suggests that the observed abundance variations in NGC 1365 are a snapshot of the dynamical local enrichment of oxygen modulated by spiral-driven, periodic mixing and dilution.

AB - The spatial distribution of oxygen in the interstellar medium of galaxies is the key to understanding how efficiently metals that are synthesized in massive stars can be redistributed across a galaxy. We present here a case study in the nearby spiral galaxy NGC 1365 using 3D optical data obtained in the TYPHOON Program. We find systematic azimuthal variations of the H ii region oxygen abundance imprinted on a negative radial gradient. The 0.2 dex azimuthal variations occur over a wide radial range of 0.3-0.7 R 25 and peak at the two spiral arms in NGC 1365. We show that the azimuthal variations can be explained by two physical processes: gas undergoes localized, sub-kiloparsec-scale self-enrichment when orbiting in the inter-arm region, and experiences efficient, kiloparsec-scale mixing-induced dilution when spiral density waves pass through. We construct a simple chemical evolution model to quantitatively test this picture and find that our toy model can reproduce the observations. This result suggests that the observed abundance variations in NGC 1365 are a snapshot of the dynamical local enrichment of oxygen modulated by spiral-driven, periodic mixing and dilution.

KW - galaxies: ISM

KW - galaxies: abundances

KW - galaxies: individual (NGC1365)

KW - galaxies: spiral

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DO - 10.3847/1538-4357/aa8460

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JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365

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