Characterizing the radial oxygen abundance distribution in disk galaxies
The relation between the radial oxygen abundance distribution (gradient) and other parameters of a galaxy such as mass, Hubble type, and a bar strength, remains unclear although a large amount of observational data have been obtained in the past years.<i>Aims<i/>. We examine the possible...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
25 February 2019
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| In: |
Astronomy and astrophysics
Year: 2019, Volume: 623 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201834364 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1051/0004-6361/201834364 Verlag, Volltext: https://www.aanda.org/articles/aa/pdf/2019/03/aa34364-18.pdf 
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| Author Notes: | I.A. Zinchenko, A. Just, L.S. Pilyugin, M.A. Lara-Lopez |
MARC
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| 100 | 1 | |a Zinchenko, Igor A. |e VerfasserIn |0 (DE-588)1115808605 |0 (DE-627)870030485 |0 (DE-576)477936709 |4 aut | |
| 245 | 1 | 0 | |a Characterizing the radial oxygen abundance distribution in disk galaxies |c I.A. Zinchenko, A. Just, L.S. Pilyugin, M.A. Lara-Lopez |
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| 520 | |a The relation between the radial oxygen abundance distribution (gradient) and other parameters of a galaxy such as mass, Hubble type, and a bar strength, remains unclear although a large amount of observational data have been obtained in the past years.<i>Aims<i/>. We examine the possible dependence of the radial oxygen abundance distribution on non-axisymmetrical structures (bar/spirals) and other macroscopic parameters such as the mass, the optical radius <i>R<i/><sub>25<sub/>, the color <i>g<i/> − <i>r<i/>, and the surface brightness of the galaxy. A sample of disk galaxies from the third data release of the Calar Alto Legacy Integral Field Area Survey (CALIFA DR3) is considered.<i>Methods<i/>. We adopted the Fourier amplitude <i>A<i/><sub>2<sub/> of the surface brightness as a quantitative characteristic of the strength of non-axisymmetric structures in a galactic disk, in addition to the commonly used morphologic division for A, AB, and B types based on the Hubble classification. To distinguish changes in local oxygen abundance caused by the non-axisymmetrical structures, the multiparametric mass-metallicity relation was constructed as a function of parameters such as the bar/spiral pattern strength, the disk size, color index <i>g<i/> − <i>r<i/> in the Sloan Digital Sky Survey (SDSS) bands, and central surface brightness of the disk. The gas-phase oxygen abundance gradient is determined by using the R calibration.<i>Results<i/>. We find that there is no significant impact of the non-axisymmetric structures such as a bar and/or spiral patterns on the local oxygen abundance and radial oxygen abundance gradient of disk galaxies. Galaxies with higher mass, however, exhibit flatter oxygen abundance gradients in units of dex/kpc, but this effect is significantly less prominent for the oxygen abundance gradients in units of dex/<i>R<i/><sub>25<sub/> and almost disappears when the inner parts are avoided (<i>R<i/> > 0.25<i>R<i/><sub>25<sub/>). We show that the oxygen abundance in the central part of the galaxy depends neither on the optical radius <i>R<i/><sub>25<sub/> nor on the color <i>g<i/> − <i>r<i/> or the surface brightness of the galaxy. Instead, outside the central part of the galaxy, the oxygen abundance increases with <i>g<i/> − <i>r<i/> value and central surface brightness of the disk. | ||
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| 700 | 1 | |a Lara-Lopez, Maritza Arlene |e VerfasserIn |4 aut | |
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