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Photometric metallicity map of the Small Magellanic Cloud


Choudhury, S and Subramaniam, A and Cole, AA and Sohn, Y-J, Photometric metallicity map of the Small Magellanic Cloud, Monthly Notices of the Royal Astronomical Society, 475, (4) pp. 4279-4297. ISSN 0035-8711 (2018) [Refereed Article]

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DOI: doi:10.1093/mnras/sty087


We have created an estimated metallicity map of the Small Magellanic Cloud (SMC) using the Magellanic Cloud Photometric Survey (MCPS) and Optical Gravitational Lensing Experiment (OGLE III) photometric data. This is a first of its kind map of metallicity up to a radius of ∼2.5°. We identify the Red Giant Branch (RGB) in the V, (V − I) colour–magnitude diagrams of small sub-regions of varying sizes in both data sets. We use the slope of the RGB as an indicator of the average metallicity of a sub-region and calibrate the RGB slope to metallicity using available spectroscopic data for selected sub-regions. The average metallicity of the SMC is found to be [Fe/H] = −0.94 dex (σ[Fe/H] = 0.09) from OGLE III and [Fe/H] = −0.95 dex (σ[Fe/H] = 0.08) from MCPS. We confirm a shallow but significant metallicity gradient within the inner SMC up to a radius of 2.5° (−0.045 ± 0.004 to −0.067 ± 0.006 dex deg−1).

Item Details

Item Type:Refereed Article
Keywords:Magellanic Clouds, galaxies- abundances, color-magnitude diagrams, chemical evolution, local group, Hertzsprung-Russell, color-magnitude diagrams
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
UTAS Author:Cole, AA (Associate Professor Andrew Cole)
ID Code:130038
Year Published:2018
Deposited By:Mathematics and Physics
Deposited On:2019-01-08
Last Modified:2019-01-16

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