Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6888
Title: Photometric metallicity map of the large magellanic cloud
Authors: Choudhury, Samyaday
Subramaniam, A
Cole, A. A
Keywords: Stars: abundances;Hertzsprung–Russell and colour–magnitude diagrams;Galaxies: abundances;Magellanic clouds
Issue Date: 11-Jan-2016
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 455, No. 2, pp. 1855-1880
Abstract: 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°–5°, 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 (σ[Fe/H] = 0.12) from MCPS data, and [Fe/H] = −0.39 dex (σ[Fe/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.
Description: Restricted Access
URI: http://hdl.handle.net/2248/6888
ISSN: 1365-2966
???metadata.dc.rights???: © Royal Astronomical Society
???metadata.dc.relation.uri???: http://dx.doi.org/ 10.1093/mnras/stv2414
Appears in Collections:IIAP Publications

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