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Photometric metallicity map of the Large Magellanic Cloud

Choudhury, Samyaday and Subramaniam, Annapurni and Cole, Andrew A (2016) Photometric metallicity map of the Large Magellanic Cloud. In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 455 (2). pp. 1855-1880.

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Official URL: http://dx.doi.org/10.1093/mnras/stv2414


We have estimated a metallicity map of the Large Magellanic Cloud (LMC) 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 4 degrees-5 degrees, derived using photometric data and calibrated using spectroscopic data of Red Giant Branch (RGB) stars. We identify the RGB in the V, (V - I) colour-magnitude diagrams of small subregions of varying sizes in both data sets. We use the slope of the RGB as an indicator of the average metallicity of a subregion, and calibrate the RGB slope to metallicity using spectroscopic data for field and cluster red giants in selected subregions. The average metallicity of the LMC is found to be Fe/H] = -0.37 dex (sigmaFe/H] = 0.12) from MCPS data, and Fe/H] = -0.39 dex (sigmaFe/H] = 0.10) from OGLE III data. The bar is found to be the most metal-rich region of the LMC. Both the data sets suggest a shallow radial metallicity gradient up to a radius of 4 kpc (-0.049 +/- 0.002 dex kpc(-1) to -0.066 +/- 0.006 dex kpc(-1)). Subregions in which the mean metallicity differs from the surrounding areas do not appear to correlate with previously known features; spectroscopic studies are required in order to assess their physical significance.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Keywords: stars: abundances; Hertzsprung-Russell and colour-magnitude diagrams; galaxies: abundances; Magellanic Clouds
Department/Centre: Others
Date Deposited: 17 Feb 2016 05:16
Last Modified: 17 Feb 2016 05:16
URI: http://eprints.iisc.ernet.in/id/eprint/53228

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