Digging deeper into the southern skies: A compact milky way companion discovered in first-year dark energy survey data

E. Luque, A. Queiroz, B. Santiago, A. Pieres, E. Balbinot, K. Bechtol, A. Drlica-Wagner, A. Fausti Neto, L. N. da Costa, M. A.G. Maia, B. Yanny, T. Abbott, S. Allam, A. Benoit-Lévy, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero Rosell, M. Carrasco KindJ. Carretero, C. E. Cunha, S. Desai, H. T. Diehl, J. P. Dietrich, T. F. Eifler, D. A. Finley, B. Flaugher, P. Fosalba, J. Frieman, D. W. Gerdes, D. Gruen, G. Gutierrez, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, T. S. Li, M. March, J. L. Marshall, P. Martini, R. Miquel, E. Neilsen, R. C. Nichol, B. Nord, R. Ogando, A. A. Plazas, A. K. Romer, A. Roodman, E. Sanchez, V. Scarpine, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, J. Thaler, D. Tucker, A. R. Walker, Y. Zhang

Research output: Contribution to journalArticle

37 Citations (Scopus)

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 (eopen ~ 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.

Original languageEnglish (US)
Pages (from-to)603-612
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume458
Issue number1
DOIs
StatePublished - Feb 22 2016
Externally publishedYes

Fingerprint

Southern sky
dark energy
energy
stellar systems
matched filters
galactic halos
parameterization
point sources
metallicity
point source
halos
luminosity
probe
galaxies
filter
radii
probes
metal
profiles
metals

Keywords

  • Galaxies: dwarf
  • Globular clusters: general
  • Globular clusters: individual (DES 1)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Digging deeper into the southern skies : A compact milky way companion discovered in first-year dark energy survey data. / Luque, E.; Queiroz, A.; Santiago, B.; Pieres, A.; Balbinot, E.; Bechtol, K.; Drlica-Wagner, A.; Fausti Neto, A.; N. da Costa, L.; Maia, M. A.G.; Yanny, B.; Abbott, T.; Allam, S.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Burke, D. L.; Carnero Rosell, A.; Carrasco Kind, M.; 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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 458, No. 1, 22.02.2016, p. 603-612.

Research output: Contribution to journalArticle

Luque, E, Queiroz, A, Santiago, B, Pieres, A, Balbinot, E, Bechtol, K, Drlica-Wagner, A, Fausti Neto, A, N. da Costa, L, Maia, MAG, Yanny, B, Abbott, T, Allam, S, Benoit-Lévy, A, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Carnero Rosell, A, Carrasco Kind, M, Carretero, J, Cunha, CE, Desai, S, Diehl, HT, Dietrich, JP, Eifler, TF, Finley, DA, Flaugher, B, Fosalba, P, Frieman, J, Gerdes, DW, Gruen, D, Gutierrez, G, Honscheid, K, James, DJ, Kuehn, K, Kuropatkin, N, Lahav, O, Li, TS, March, M, Marshall, JL, Martini, P, Miquel, R, Neilsen, E, Nichol, RC, Nord, B, Ogando, R, Plazas, AA, Romer, AK, Roodman, A, Sanchez, E, Scarpine, V, Schubnell, M, Sevilla-Noarbe, I, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thaler, J, Tucker, D, Walker, AR & Zhang, Y 2016, 'Digging deeper into the southern skies: A compact milky way companion discovered in first-year dark energy survey data', Monthly Notices of the Royal Astronomical Society, vol. 458, no. 1, pp. 603-612. https://doi.org/10.1093/mnras/stw302
Luque, E. ; Queiroz, A. ; Santiago, B. ; Pieres, A. ; Balbinot, E. ; Bechtol, K. ; Drlica-Wagner, A. ; Fausti Neto, A. ; N. da Costa, L. ; Maia, M. A.G. ; Yanny, B. ; Abbott, T. ; Allam, S. ; Benoit-Lévy, A. ; Bertin, E. ; Brooks, D. ; Buckley-Geer, E. ; Burke, D. L. ; Carnero Rosell, A. ; Carrasco Kind, M. ; 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. / Digging deeper into the southern skies : A compact milky way companion discovered in first-year dark energy survey data. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 458, No. 1. pp. 603-612.
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title = "Digging deeper into the southern skies: A compact milky way companion discovered in first-year dark energy survey data",
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 (eopen ~ 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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TY - JOUR

T1 - Digging deeper into the southern skies

T2 - A compact milky way companion discovered in first-year dark energy survey data

AU - Luque, E.

AU - Queiroz, A.

AU - Santiago, B.

AU - Pieres, A.

AU - Balbinot, E.

AU - Bechtol, K.

AU - Drlica-Wagner, A.

AU - Fausti Neto, A.

AU - N. da Costa, L.

AU - Maia, M. A.G.

AU - Yanny, B.

AU - Abbott, T.

AU - Allam, S.

AU - Benoit-Lévy, A.

AU - Bertin, E.

AU - Brooks, D.

AU - Buckley-Geer, E.

AU - Burke, D. L.

AU - Carnero Rosell, A.

AU - Carrasco Kind, M.

AU - Carretero, J.

AU - Cunha, C. E.

AU - Desai, S.

AU - Diehl, H. T.

AU - Dietrich, J. P.

AU - Eifler, T. F.

AU - Finley, D. A.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - Gerdes, D. W.

AU - Gruen, D.

AU - Gutierrez, G.

AU - Honscheid, K.

AU - James, D. J.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Lahav, O.

AU - Li, T. S.

AU - March, M.

AU - Marshall, J. L.

AU - Martini, P.

AU - Miquel, R.

AU - Neilsen, E.

AU - Nichol, R. C.

AU - Nord, B.

AU - Ogando, R.

AU - Plazas, A. A.

AU - Romer, A. K.

AU - Roodman, A.

AU - Sanchez, E.

AU - Scarpine, V.

AU - Schubnell, M.

AU - Sevilla-Noarbe, I.

AU - Smith, R. C.

AU - Soares-Santos, M.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Thaler, J.

AU - Tucker, D.

AU - Walker, A. R.

AU - Zhang, Y.

PY - 2016/2/22

Y1 - 2016/2/22

N2 - 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 (eopen ~ 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.

AB - 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 (eopen ~ 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.

KW - Galaxies: dwarf

KW - Globular clusters: general

KW - Globular clusters: individual (DES 1)

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