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Physical properties of star clusters in the outer LMC as observed by the Dark Energy Survey

Pieres, A, Santiago, B, Balbinot, E, Luque, E, Queiroz, ABA, Costa, LND, Maia, MAG, Drlica-Wagner, A, Roodman, A, Abbott, C , Allam, S, Benoit-Levy, A, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Rosell, AC, Kind, MC, Carretero, J, Cunha, CE, Desai, S, Diehl, HT, Eifler, TF, Finley, DA, Flaugher, B, Fosalba, P, Frieman, J, Gerdes, DW, Gruen, D, Gruendl, RA, Gutierrez, G, Honscheid, K, James, DJ, Kuehn, K, Kuropatkin, N, Lahav, O, Li, TS, Marshall, JL, Martini, P, Miller, CJ, Miquel, R, Nichol, RC, Nord, B, Ogando, R, Plazas, AA, Romer, AK, Sanchez, E, Scarpine, V, Schubnell, M, Sevilla-Noarbe, I, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thaler, J, Thomas, D, Tucker, D and Walker, AR (2015) Physical properties of star clusters in the outer LMC as observed by the Dark Energy Survey

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Abstract

The Large Magellanic Cloud (LMC) harbors a rich and diverse system of star clusters, whose ages, chemical abundances, and positions provide information about the LMC history of star formation. We use Science Verification imaging data from the Dark Energy Survey to increase the census of known star clusters in the outer LMC and to derive physical parameters for a large sample of such objects using a spatially and photometrically homogeneous data set. Our sample contains 255 visually identified cluster candidates, of which 109 were not listed in any previous catalog. We quantify the crowding effect for the stellar sample produced by the DES Data Management pipeline and conclude that the stellar completeness is < 10% inside typical LMC cluster cores. We therefore develop a pipeline to sample and measure stellar magnitudes and positions around the cluster candidates using DAOPHOT. We also implement a maximum-likelihood method to fit individual density profiles and colour-magnitude diagrams. For 117 (from a total of 255) of the cluster candidates (28 uncatalogued clusters), we obtain reliable ages, metallicities, distance moduli and structural parameters, confirming their nature as physical systems. The distribution of cluster metallicities shows a radial dependence, with no clusters more metal-rich than [Fe/H] ~ -0.7 beyond 8 kpc from the LMC center. The age distribution has two peaks at ~ 1.2 Gyr and ~ 2.7 Gyr.

Item Type: Article
Authors :
NameEmailORCID
Pieres, AUNSPECIFIEDUNSPECIFIED
Santiago, BUNSPECIFIEDUNSPECIFIED
Balbinot, Ee.balbinot@surrey.ac.ukUNSPECIFIED
Luque, EUNSPECIFIEDUNSPECIFIED
Queiroz, ABAUNSPECIFIEDUNSPECIFIED
Costa, LNDUNSPECIFIEDUNSPECIFIED
Maia, MAGUNSPECIFIEDUNSPECIFIED
Drlica-Wagner, AUNSPECIFIEDUNSPECIFIED
Roodman, AUNSPECIFIEDUNSPECIFIED
Abbott, CUNSPECIFIEDUNSPECIFIED
Allam, SUNSPECIFIEDUNSPECIFIED
Benoit-Levy, AUNSPECIFIEDUNSPECIFIED
Bertin, EUNSPECIFIEDUNSPECIFIED
Brooks, DUNSPECIFIEDUNSPECIFIED
Buckley-Geer, EUNSPECIFIEDUNSPECIFIED
Burke, DLUNSPECIFIEDUNSPECIFIED
Rosell, ACUNSPECIFIEDUNSPECIFIED
Kind, MCUNSPECIFIEDUNSPECIFIED
Carretero, JUNSPECIFIEDUNSPECIFIED
Cunha, CEUNSPECIFIEDUNSPECIFIED
Desai, SUNSPECIFIEDUNSPECIFIED
Diehl, HTUNSPECIFIEDUNSPECIFIED
Eifler, TFUNSPECIFIEDUNSPECIFIED
Finley, DAUNSPECIFIEDUNSPECIFIED
Flaugher, BUNSPECIFIEDUNSPECIFIED
Fosalba, PUNSPECIFIEDUNSPECIFIED
Frieman, JUNSPECIFIEDUNSPECIFIED
Gerdes, DWUNSPECIFIEDUNSPECIFIED
Gruen, DUNSPECIFIEDUNSPECIFIED
Gruendl, RAUNSPECIFIEDUNSPECIFIED
Gutierrez, GUNSPECIFIEDUNSPECIFIED
Honscheid, KUNSPECIFIEDUNSPECIFIED
James, DJUNSPECIFIEDUNSPECIFIED
Kuehn, KUNSPECIFIEDUNSPECIFIED
Kuropatkin, NUNSPECIFIEDUNSPECIFIED
Lahav, OUNSPECIFIEDUNSPECIFIED
Li, TSUNSPECIFIEDUNSPECIFIED
Marshall, JLUNSPECIFIEDUNSPECIFIED
Martini, PUNSPECIFIEDUNSPECIFIED
Miller, CJUNSPECIFIEDUNSPECIFIED
Miquel, RUNSPECIFIEDUNSPECIFIED
Nichol, RCUNSPECIFIEDUNSPECIFIED
Nord, BUNSPECIFIEDUNSPECIFIED
Ogando, RUNSPECIFIEDUNSPECIFIED
Plazas, AAUNSPECIFIEDUNSPECIFIED
Romer, AKUNSPECIFIEDUNSPECIFIED
Sanchez, EUNSPECIFIEDUNSPECIFIED
Scarpine, VUNSPECIFIEDUNSPECIFIED
Schubnell, MUNSPECIFIEDUNSPECIFIED
Sevilla-Noarbe, IUNSPECIFIEDUNSPECIFIED
Smith, RCUNSPECIFIEDUNSPECIFIED
Soares-Santos, MUNSPECIFIEDUNSPECIFIED
Sobreira, FUNSPECIFIEDUNSPECIFIED
Suchyta, EUNSPECIFIEDUNSPECIFIED
Swanson, MECUNSPECIFIEDUNSPECIFIED
Tarle, GUNSPECIFIEDUNSPECIFIED
Thaler, JUNSPECIFIEDUNSPECIFIED
Thomas, DUNSPECIFIEDUNSPECIFIED
Tucker, DUNSPECIFIEDUNSPECIFIED
Walker, ARUNSPECIFIEDUNSPECIFIED
Date : 3 December 2015
Uncontrolled Keywords : astro-ph.GA, astro-ph.GA
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:46
Last Modified : 17 May 2017 15:12
URI: http://epubs.surrey.ac.uk/id/eprint/840280

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