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]
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.
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:||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 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 (Professor Andrew Cole)|
|Web of Science® Times Cited:||19|
|Deposited By:||Mathematics and Physics|
|Downloads:||43 View Download Statistics|
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