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Title:
Digging deeper into the Southern skies: a compact Milky Way companion discovered in first-year Dark Energy Survey data
Authors:
Luque, E.; Queiroz, A.; Santiago, B.; Pieres, A.; Balbinot, E.; Bechtol, K.; Drlica-Wagner, A.; Neto, A. Fausti; da Costa, L. N.; Maia, M. A. G.; Yanny, B.; Abbott, T.; Allam, S.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Eifler, T. F.; Finley, D. A.; Flaugher, B.; Fosalba, P.; Frieman, J.; Gerdes, D. W.; Gruen, D.; Gutierrez, G.; Honscheid, K.; James, D. J.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Li, T. S.; March, M.; Marshall, J. L.; Martini, P.; Miquel, R.; Neilsen, E.; Nichol, R. C.; Nord, B.; Ogando, R.; Plazas, A. A.; Romer, A. K.; Roodman, A.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thaler, J.; Tucker, D.; Walker, A. R.; Zhang, Y.
Affiliation:
AA(Instituto de Física, UFRGS, Caixa Postal 15051, Porto Alegre, RS 91501-970, Brazil; Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil ), AB(Instituto de Física, UFRGS, Caixa Postal 15051, Porto Alegre, RS 91501-970, Brazil; Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AC(Instituto de Física, UFRGS, Caixa Postal 15051, Porto Alegre, RS 91501-970, Brazil; Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AD(Instituto de Física, UFRGS, Caixa Postal 15051, Porto Alegre, RS 91501-970, Brazil; Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AE(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil; Department of Physics, University of Surrey, Guildford GU2 7XH, UK), AF(Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA), AG(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), AH(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AI(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil; Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AJ(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil; Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AK(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), AL(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile), AM(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), AN(Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK), AO(CNRS, UMR 7095, Institut d'Astrophysique de Paris, F-75014 Paris, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 7095, Institut d'Astrophysique de Paris, F-75014, Paris, France), AP(Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK), AQ(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), AR(Kavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA; SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA), AS(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil; Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), AT(Department of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801, USA; National Center for Supercomputing Applications, 1205 West Clark St, Urbana, IL 61801, USA), AU(Institut de Ciéncies de l'Espai, IEEC-CSIC, Campus UAB, Carrer de Can Magrans, s/n, E-08193 Bellaterra, Barcelona, Spain; Institut de Física d'Altes Energies, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain), AV(Kavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA), AW(Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany; Faculty of Physics, Ludwig-Maximilians University, Scheinerstr. 1, D-81679 Munich, Germany), AX(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), AY(Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching, Germany; Faculty of Physics, Ludwig-Maximilians University, Scheinerstr. 1, D-81679 Munich, Germany), AZ(Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA), BA(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), BB(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), BC(Institut de Ciéncies de l'Espai, IEEC-CSIC, Campus UAB, Carrer de Can Magrans, s/n, E-08193 Bellaterra, Barcelona, Spain), BD(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA; Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA), BE(Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA), BF(Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany; Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, Scheinerstr. 1, D-81679 München, Germany), BG(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), BH(Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA; Department of Physics, The Ohio State University, Columbus, OH 43210, USA), BI(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile), BJ(Australian Astronomical Observatory, North Ryde, NSW 2113, Australia), BK(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), BL(Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK), BM(George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA), BN(Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA), BO(George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA), BP(Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA; Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA), BQ(Institut de Física d'Altes Energies, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats, E-08010 Barcelona, Spain), BR(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), BS(Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, UK), BT(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), BU(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil; Observatório Nacional, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil), BV(Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA), BW(Department of Physics and Astronomy, Pevensey Building, University of Sussex, Brighton BN1 9QH, UK), BX(Kavli Institute for Particle Astrophysics & Cosmology, PO Box 2450, Stanford University, Stanford, CA 94305, USA; SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA), BY(Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain), BZ(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), CA(Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA), CB(Department of Astronomy, University of Illinois, 1002 W. Green Street, Urbana, IL 61801, USA; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain), CC(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile), CD(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), CE(Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil; Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), CF(Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA; Department of Physics, The Ohio State University, Columbus, OH 43210, USA), CG(National Center for Supercomputing Applications, 1205 West Clark St, Urbana, IL 61801, USA), CH(Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA), CI(Department of Physics, University of Illinois, 1110 W. Green St, Urbana, IL 61801, USA), CJ(Fermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USA), CK(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile), CL(Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 1, p.603-612 (MNRAS Homepage)
Publication Date:
05/2016
Origin:
OUP
Astronomy Keywords:
globular clusters: general, globular clusters: individual (DES 1), galaxies: dwarf
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw302
Bibliographic Code:
2016MNRAS.458..603L

Abstract

We use the first-year Dark Energy Survey (DES) data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried out by our group earlier this year. Our search is based on a matched filter algorithm that produces stellar density maps consistent with stellar population models of various ages, metallicities, and distances over the survey area. The most conspicuous density peaks in these maps have been identified automatically and ranked according to their significance and recurrence for different input models. We report the discovery of one additional stellar system besides those previously found by several authors using the same first-year DES data. The object is compact, and consistent with being dominated by an old and metal-poor population. DES 1 is found at high significance and appears in the DES images as a compact concentration of faint blue point sources. Assuming different spatial profile parameterizations, the best-fitting heliocentric distance and total absolute magnitude in the range of 77.6-87.1 kpc and -3.00 ≲ MV ≲ -2.21, respectively. The half-light radius of this object, rh ˜ 10 pc and total luminosity are consistent with it being a low-mass halo cluster. It is also found to have a very elongated shape (ε ˜ 0.57). In addition, our deeper probe of DES first-year data confirms the recently reported satellite galaxy candidate Horologium II as a significant stellar overdensity. We also infer its structural properties and compare them to those reported in the literature.
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