%0 Generic %1 collaboration2015eight %A Collaboration, The DES %A Bechtol, K. %A Drlica-Wagner, A. %A Balbinot, E. %A Pieres, A. %A Simon, J. D. %A Yanny, B. %A Santiago, B. %A Wechsler, R. H. %A Frieman, J. %A Walker, A. R. %A Williams, P. %A Rozo, E. %A Rykoff, E. S. %A Queiroz, A. %A Luque, E. %A Benoit-Levy, A. %A Bernstein, R. A. %A Tucker, D. %A Sevilla, I. %A Gruendl, R. A. %A da Costa, L. N. %A Neto, A. Fausti %A Maia, M. A. G. %A Abbott, T. %A Allam, S. %A Armstrong, R. %A Bauer, A. H. %A Bernstein, G. M. %A Bertin, E. %A Brooks, D. %A Buckley-Geer, E. %A Burke, D. L. %A Rosell, A. Carnero %A Castander, F. J. %A D'Andrea, C. B. %A DePoy, D. L. %A Desai, S. %A Diehl, H. T. %A Eifler, T. F. %A Estrada, J. %A Evrard, A. E. %A Fernandez, E. %A Finley, D. A. %A Flaugher, B. %A Gaztanaga, E. %A Gerdes, D. %A Girardi, L. %A Gladders, M. %A Gruen, D. %A Gutierrez, G. %A Hao, J. %A Honscheid, K. %A Jain, B. %A James, D. %A Kent, S. %A Kron, R. %A Kuehn, K. %A Kuropatkin, N. %A Lahav, O. %A Li, T. S. %A Lin, H. %A Makler, M. %A March, M. %A Marshall, J. %A Martini, P. %A Merritt, K. W. %A Miller, C. %A Miquel, R. %A Mohr, J. %A Neilsen, E. %A Nichol, R. %A Nord, B. %A Ogando, R. %A Peoples, J. %A Petravick, D. %A Plazas, A. A. %A Romer, A. K. %A Roodman, A. %A Sako, M. %A Sanchez, E. %A Scarpine, V. %A Schubnell, M. %A Smith, R. C. %A Soares-Santos, M. %A Sobreira, F. %A Suchyta, E. %A Swanson, M. E. C. %A Tarle, G. %A Thaler, J. %A Thomas, D. %A Wester, W. %A Zuntz, J. %D 2015 %K DES milkyway satellites %T Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data %U http://arxiv.org/abs/1503.02584 %X We report the discovery of eight new Milky Way companions in ~1,800 deg^2 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 mag to -7.4 mag), physical sizes (10 pc to 170 pc), and heliocentric distances (30 kpc to 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.

@misc{collaboration2015eight, abstract = {We report the discovery of eight new Milky Way companions in ~1,800 deg^2 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 mag to -7.4 mag), physical sizes (10 pc to 170 pc), and heliocentric distances (30 kpc to 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.}, added-at = {2015-03-10T09:47:59.000+0100}, author = {Collaboration, The DES and Bechtol, K. and Drlica-Wagner, A. and Balbinot, E. and Pieres, A. and Simon, J. D. and Yanny, B. and Santiago, B. and Wechsler, R. H. and Frieman, J. and Walker, A. R. and Williams, P. and Rozo, E. and Rykoff, E. S. and Queiroz, A. and Luque, E. and Benoit-Levy, A. and Bernstein, R. A. and Tucker, D. and Sevilla, I. and Gruendl, R. A. and da Costa, L. N. and Neto, A. Fausti and Maia, M. A. G. and Abbott, T. and Allam, S. and Armstrong, R. and Bauer, A. H. and Bernstein, G. M. and Bertin, E. and Brooks, D. and Buckley-Geer, E. and Burke, D. L. and Rosell, A. Carnero and Castander, F. J. and D'Andrea, C. B. and DePoy, D. L. and Desai, S. and Diehl, H. T. and Eifler, T. F. and Estrada, J. and Evrard, A. E. and Fernandez, E. and Finley, D. A. and Flaugher, B. and Gaztanaga, E. and Gerdes, D. and Girardi, L. and Gladders, M. and Gruen, D. and Gutierrez, G. and Hao, J. and Honscheid, K. and Jain, B. and James, D. and Kent, S. and Kron, R. and Kuehn, K. and Kuropatkin, N. and Lahav, O. and Li, T. S. and Lin, H. and Makler, M. and March, M. and Marshall, J. and Martini, P. and Merritt, K. W. and Miller, C. and Miquel, R. and Mohr, J. and Neilsen, E. and Nichol, R. and Nord, B. and Ogando, R. and Peoples, J. and Petravick, D. and Plazas, A. A. and Romer, A. K. and Roodman, A. and Sako, M. and Sanchez, E. and Scarpine, V. and Schubnell, M. and Smith, R. C. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Swanson, M. E. C. and Tarle, G. and Thaler, J. and Thomas, D. and Wester, W. and Zuntz, J.}, biburl = {https://www.bibsonomy.org/bibtex/2b4b0938933de9928a6af6bbbba5863e6/miki}, description = {[1503.02584] Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data}, interhash = {89690b286a0352d1fb79efe5db906cc9}, intrahash = {b4b0938933de9928a6af6bbbba5863e6}, keywords = {DES milkyway satellites}, note = {cite arxiv:1503.02584Comment: 33 pages, 12 figures, 3 tables. Submitted to ApJ. Readers may be interested in the concurrent work by Koposov, Belokurov, Torrealba, & Evans. Indirect dark matter search results are presented in Drlica-Wagner, Albert, Bechtol, Wood, Strigari, et al. (The LAT and DES Collaborations)}, timestamp = {2015-03-10T09:47:59.000+0100}, title = {Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data}, url = {http://arxiv.org/abs/1503.02584}, year = 2015 }