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Photometric metallicity map of the Small Magellanic Cloud

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Choudhury, Sidratul, Subramaniam, A, Cole, AA ORCID: 0000-0003-0303-3855 and Sohn, Y-J 2018 , 'Photometric metallicity map of the Small Magellanic Cloud' , Monthly Notices of the Royal Astronomical Society, vol. 475, no. 4 , 4279–4297 , doi: 10.1093/mnras/sty087.

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Abstract

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 Type: Article
Authors/Creators:Choudhury, Sidratul and Subramaniam, A and Cole, AA and Sohn, Y-J
Keywords: Magellanic Clouds, galaxies- abundances, color-magnitude diagrams, chemical evolution, local group, Hertzsprung-Russell, color-magnitude diagrams
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Blackwell Publishing Ltd
ISSN: 0035-8711
DOI / ID Number: 10.1093/mnras/sty087
Copyright Information:

Copyright 2018 The Authors. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©:2018. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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