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The Dark Energy Survey (DES) is a 5000 sq. degree survey in the southernhemisphere, which is rapidly reducing the existing north-south asymmetry in thecensus of MW satellites and other stellar substructure. We use the first-yearDES data down to previously unprobed photometric depths to search for stellarsystems in the Galactic halo, therefore complementing the previous analysis ofthe same data carried out by our group earlier this year. Our search is basedon a matched filter algorithm that produces stellar density maps consistentwith stellar population models of various ages, metallicities, and distancesover the survey area. The most conspicuous density peaks in these maps havebeen identified automatically and ranked according to their significance andrecurrence for different input models. We report the discovery of oneadditional stellar system besides those previously found by several authorsusing the same first-year DES data. The object is compact, and consistent withbeing dominated by an old and metal-poor population. DES J0034-4902 is found athigh significance and appears in the DES images as a compact concentration offaint blue point sources at ~ 87 {kpc}. Its half-light radius of r_h = 9.88 +/-4.31 {pc} and total luminosity of M_V ~ -3.05_{-0.42}^{+0.69} are consistentwith it being a low mass halo cluster. It is also found to have a veryelongated shape. In addition, our deeper probe of DES 1st year data confirmsthe recently reported satellite galaxy candidate Horologium II as a significantstellar overdensity. We also infer its structural properties and compare themto those reported in the literature.

Digging deeper into the Southern skies: a compact Milky-Way companion discovered in first-year Dark Energy Survey data