EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA

K. Bechtol; A. Drlica-Wagner; E. Balbinot; A. Pieres; J. D. Simon; B. Yanny; B. Santiago; R. H. Wechsler; J. Frieman; A. R. Walker; P. Williams; E. Rozo; E. S. Rykoff; A. Queiroz; E. Luque; A. Benoit-Lévy; D. Tucker; I. Sevilla; R. A. Gruendl; L. N. Da Costa; A. Fausti Neto; M. A.G. Maia; T. Abbott; S. Allam; R. Armstrong; A. H. Bauer; G. M. Bernstein; R. A. Bernstein; E. Bertin; D. Brooks; E. Buckley-Geer; D. L. Burke; A. Carnero Rosell; F. J. Castander; R. Covarrubias; C. B. D'Andrea; D. L. DePoy; S. Desai; H. T. Diehl; T. F. Eifler; J. Estrada; A. E. Evrard; E. Fernandez; D. A. Finley; B. Flaugher; E. Gaztanaga; D. Gerdes; L. Girardi; M. Gladders; D. Gruen; G. Gutierrez; J. Hao; K. Honscheid; B. Jain; D. James; S. Kent; R. Kron; K. Kuehn; N. Kuropatkin; O. Lahav; T. S. Li; H. Lin; M. Makler; M. March; J. Marshall; P. Martini; K. W. Merritt; C. Miller; R. Miquel; J. Mohr; E. Neilsen; R. Nichol; B. Nord; R. Ogando; J. Peoples; D. Petravick; A. A. Plazas; A. K. Romer; A. Roodman; M. Sako; E. Sanchez; V. Scarpine; M. Schubnell; R. C. Smith; M. Soares-Santos; F. Sobreira; E. Suchyta; M. E.C. Swanson; G. Tarle; J. Thaler; D. Thomas; W. Wester; J. Zuntz

doi:10.1088/0004-637X/807/1/50

EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA

K. Bechtol, A. Drlica-Wagner, E. Balbinot, A. Pieres, J. D. Simon, B. Yanny, B. Santiago, R. H. Wechsler, J. Frieman, A. R. Walker, P. Williams, E. Rozo, E. S. Rykoff, A. Queiroz, E. Luque, A. Benoit-Lévy, D. Tucker, I. Sevilla, R. A. Gruendl, L. N. Da CostaA. Fausti Neto, M. A.G. Maia, T. Abbott, S. Allam, R. Armstrong, A. H. Bauer, G. M. Bernstein, R. A. Bernstein, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero Rosell, F. J. Castander, R. Covarrubias, C. B. D'Andrea, D. L. DePoy, S. Desai, H. T. Diehl, T. F. Eifler, J. Estrada, A. E. Evrard, E. Fernandez, D. A. Finley, B. Flaugher, E. Gaztanaga, D. Gerdes, L. Girardi, M. Gladders, D. Gruen, G. Gutierrez, J. Hao, K. Honscheid, B. Jain, D. James, S. Kent, R. Kron, K. Kuehn, N. Kuropatkin, O. Lahav, T. S. Li, H. Lin, M. Makler, M. March, J. Marshall, P. Martini, K. W. Merritt, C. Miller, R. Miquel, J. Mohr, E. Neilsen, R. Nichol, B. Nord, R. Ogando, J. Peoples, D. Petravick, A. A. Plazas, A. K. Romer, A. Roodman, M. Sako, E. Sanchez, V. Scarpine, M. Schubnell, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, J. Thaler, D. Thomas, W. Wester, J. Zuntz

Physics

Research output: Contribution to journal › Article › peer-review

473 Scopus citations

Abstract

We report the discovery of eight new Milky Way companions in ∼ 1800 deg² of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant over-density of individual stars consistent with the expected isochrone and luminosity function of an old and metal-poor stellar population. The objects span a wide range of absolute magnitudes (M_V from -2.2 to -7.4 mag), physical sizes (10 - 170 pc), and heliocentric distances (30 - 330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. We introduce a likelihood-based algorithm to search for and characterize stellar over-densities, as well as identify stars with high satellite membership probabilities. We also present completeness estimates for detecting ultra-faint galaxies of varying luminosities, sizes, and heliocentric distances in the first-year DES data.

Original language	English (US)
Article number	50
Journal	Astrophysical Journal
Volume	807
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/807/1/50
State	Published - Jul 1 2015

Keywords

Local Group
galaxies: dwarf

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/807/1/50

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Bechtol, K., Drlica-Wagner, A., Balbinot, E., Pieres, A., Simon, J. D., Yanny, B., Santiago, B., Wechsler, R. H., Frieman, J., Walker, A. R., Williams, P., Rozo, E., Rykoff, E. S., Queiroz, A., Luque, E., Benoit-Lévy, A., Tucker, D., Sevilla, I., Gruendl, R. A., ... Zuntz, J. (2015). EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA. Astrophysical Journal, 807(1), Article 50. https://doi.org/10.1088/0004-637X/807/1/50

Bechtol, K, Drlica-Wagner, A, Balbinot, E, Pieres, A, Simon, JD, Yanny, B, Santiago, B, Wechsler, RH, Frieman, J, Walker, AR, Williams, P, Rozo, E, Rykoff, ES, Queiroz, A, Luque, E, Benoit-Lévy, A, Tucker, D, Sevilla, I, Gruendl, RA, Da Costa, LN, Neto, AF, Maia, MAG, Abbott, T, Allam, S, Armstrong, R, Bauer, AH, Bernstein, GM, Bernstein, RA, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Rosell, AC, Castander, FJ, Covarrubias, R, D'Andrea, CB, DePoy, DL, Desai, S, Diehl, HT, Eifler, TF, Estrada, J, Evrard, AE, Fernandez, E, Finley, DA, Flaugher, B, Gaztanaga, E, Gerdes, D, Girardi, L, Gladders, M, Gruen, D, Gutierrez, G, Hao, J, Honscheid, K, Jain, B, James, D, Kent, S, Kron, R, Kuehn, K, Kuropatkin, N, Lahav, O, Li, TS, Lin, H, Makler, M, March, M, Marshall, J, Martini, P, Merritt, KW, Miller, C, Miquel, R, Mohr, J, Neilsen, E, Nichol, R, Nord, B, Ogando, R, Peoples, J, Petravick, D, Plazas, AA, Romer, AK, Roodman, A, Sako, M, Sanchez, E, Scarpine, V, Schubnell, M, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thaler, J, Thomas, D, Wester, W & Zuntz, J 2015, 'EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA', Astrophysical Journal, vol. 807, no. 1, 50. https://doi.org/10.1088/0004-637X/807/1/50

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title = "EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA",

abstract = "We report the discovery of eight new Milky Way companions in ∼ 1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant over-density of individual stars consistent with the expected isochrone and luminosity function of an old and metal-poor stellar population. The objects span a wide range of absolute magnitudes (MV from -2.2 to -7.4 mag), physical sizes (10 - 170 pc), and heliocentric distances (30 - 330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. We introduce a likelihood-based algorithm to search for and characterize stellar over-densities, as well as identify stars with high satellite membership probabilities. We also present completeness estimates for detecting ultra-faint galaxies of varying luminosities, sizes, and heliocentric distances in the first-year DES data.",

keywords = "Local Group, galaxies: dwarf",

author = "K. Bechtol and A. Drlica-Wagner and E. Balbinot and A. Pieres and Simon, {J. D.} and B. Yanny and B. Santiago and Wechsler, {R. H.} and J. Frieman and Walker, {A. R.} and P. Williams and E. Rozo and Rykoff, {E. S.} and A. Queiroz and E. Luque and A. Benoit-L{\'e}vy and D. Tucker and I. Sevilla and Gruendl, {R. A.} and {Da Costa}, {L. N.} and Neto, {A. Fausti} and Maia, {M. A.G.} and T. Abbott and S. Allam and R. Armstrong and Bauer, {A. H.} and Bernstein, {G. M.} and Bernstein, {R. A.} and E. Bertin and D. Brooks and E. Buckley-Geer and Burke, {D. L.} and Rosell, {A. Carnero} and Castander, {F. J.} and R. Covarrubias and D'Andrea, {C. B.} and DePoy, {D. L.} and S. Desai and Diehl, {H. T.} and Eifler, {T. F.} and J. Estrada and Evrard, {A. E.} and E. Fernandez and Finley, {D. A.} and B. Flaugher and E. Gaztanaga and D. Gerdes and L. Girardi and M. Gladders and D. Gruen and G. Gutierrez and J. Hao and K. Honscheid and B. Jain and D. James and S. Kent and R. Kron and K. Kuehn and N. Kuropatkin and O. Lahav and Li, {T. S.} and H. Lin and M. Makler and M. March and J. Marshall and P. Martini and Merritt, {K. W.} and C. Miller and R. Miquel and J. Mohr and E. Neilsen and R. Nichol and B. Nord and R. Ogando and J. Peoples and D. Petravick and Plazas, {A. A.} and Romer, {A. K.} and A. Roodman and M. Sako and E. Sanchez and V. Scarpine and M. Schubnell and Smith, {R. C.} and M. Soares-Santos and F. Sobreira and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and J. Thaler and D. Thomas and W. Wester and J. Zuntz",

year = "2015",

month = jul,

day = "1",

doi = "10.1088/0004-637X/807/1/50",

language = "English (US)",

volume = "807",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

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TY - JOUR

T1 - EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA

AU - Bechtol, K.

AU - Drlica-Wagner, A.

AU - Balbinot, E.

AU - Pieres, A.

AU - Simon, J. D.

AU - Yanny, B.

AU - Santiago, B.

AU - Wechsler, R. H.

AU - Frieman, J.

AU - Walker, A. R.

AU - Williams, P.

AU - Rozo, E.

AU - Rykoff, E. S.

AU - Queiroz, A.

AU - Luque, E.

AU - Benoit-Lévy, A.

AU - Tucker, D.

AU - Sevilla, I.

AU - Gruendl, R. A.

AU - Da Costa, L. N.

AU - Neto, A. Fausti

AU - Maia, M. A.G.

AU - Abbott, T.

AU - Allam, S.

AU - Armstrong, R.

AU - Bauer, A. H.

AU - Bernstein, G. M.

AU - Bernstein, R. A.

AU - Bertin, E.

AU - Brooks, D.

AU - Buckley-Geer, E.

AU - Burke, D. L.

AU - Rosell, A. Carnero

AU - Castander, F. J.

AU - Covarrubias, R.

AU - D'Andrea, C. B.

AU - DePoy, D. L.

AU - Desai, S.

AU - Diehl, H. T.

AU - Eifler, T. F.

AU - Estrada, J.

AU - Evrard, A. E.

AU - Fernandez, E.

AU - Finley, D. A.

AU - Flaugher, B.

AU - Gaztanaga, E.

AU - Gerdes, D.

AU - Girardi, L.

AU - Gladders, M.

AU - Gruen, D.

AU - Gutierrez, G.

AU - Hao, J.

AU - Honscheid, K.

AU - Jain, B.

AU - James, D.

AU - Kent, S.

AU - Kron, R.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Lahav, O.

AU - Li, T. S.

AU - Lin, H.

AU - Makler, M.

AU - March, M.

AU - Marshall, J.

AU - Martini, P.

AU - Merritt, K. W.

AU - Miller, C.

AU - Miquel, R.

AU - Mohr, J.

AU - Neilsen, E.

AU - Nichol, R.

AU - Nord, B.

AU - Ogando, R.

AU - Peoples, J.

AU - Petravick, D.

AU - Plazas, A. A.

AU - Romer, A. K.

AU - Roodman, A.

AU - Sako, M.

AU - Sanchez, E.

AU - Scarpine, V.

AU - Schubnell, M.

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 - Thomas, D.

AU - Wester, W.

AU - Zuntz, J.

PY - 2015/7/1

Y1 - 2015/7/1

N2 - We report the discovery of eight new Milky Way companions in ∼ 1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant over-density of individual stars consistent with the expected isochrone and luminosity function of an old and metal-poor stellar population. The objects span a wide range of absolute magnitudes (MV from -2.2 to -7.4 mag), physical sizes (10 - 170 pc), and heliocentric distances (30 - 330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. We introduce a likelihood-based algorithm to search for and characterize stellar over-densities, as well as identify stars with high satellite membership probabilities. We also present completeness estimates for detecting ultra-faint galaxies of varying luminosities, sizes, and heliocentric distances in the first-year DES data.

AB - We report the discovery of eight new Milky Way companions in ∼ 1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant over-density of individual stars consistent with the expected isochrone and luminosity function of an old and metal-poor stellar population. The objects span a wide range of absolute magnitudes (MV from -2.2 to -7.4 mag), physical sizes (10 - 170 pc), and heliocentric distances (30 - 330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. We introduce a likelihood-based algorithm to search for and characterize stellar over-densities, as well as identify stars with high satellite membership probabilities. We also present completeness estimates for detecting ultra-faint galaxies of varying luminosities, sizes, and heliocentric distances in the first-year DES data.

KW - Local Group

KW - galaxies: dwarf

UR - http://www.scopus.com/inward/record.url?scp=84936803115&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84936803115&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/807/1/50

DO - 10.1088/0004-637X/807/1/50

M3 - Article

AN - SCOPUS:84936803115

SN - 0004-637X

VL - 807

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 50

ER -

EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA

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