Tails and streams around the Galactic globular clusters NGC 1851, NGC 1904, NGC 2298 and NGC 2808
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2018Metadata
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Carballo Bello, Julio A.
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Tails and streams around the Galactic globular clusters NGC 1851, NGC 1904, NGC 2298 and NGC 2808
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Abstract
We present Dark Energy Camera imaging for the peculiar Galactic globular clustersNGC 1851, NGC1904 (M 79), NGC2298 and NGC2808. Our deep photometry reveals that all the clusters have an important contribution of stars beyond their King tidal radii and present tails with different morphologies. We have also explored the surroundings of the clusters where the presence of the Canis Major overdensity and/or the low Galactic latitude Monoceros ring at d(circle dot) similar to 8 kpc is evident. A second stellar system is found at d(circle dot) similar to 17 kpc and spans at least 18 deg x 15 deg in the sky. As one of the possible scenarios to explain that feature, we propose that the unveiled system is part of Monoceros explained as a density wave moving towards the outer Milky Way. Alternatively, the unveiled system might be connected with other known halo substructures or associated with the progenitor dwarf galaxy of NGC1851 and NGC1904, which are widely considered accreted globular clusters.
Patrocinador
CONICYT-Chile FONDECYT
3160502
Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio
IC120009
CONICYT's PCI program
DPI20140066
CONICYT-PCHA/Doctorado Nacional
2015-21151643
German Research Foundation (DFG)
Sonderforschungsbereich 881
FONDECYT
1171273
117064
Basal-CONICYT Center for Astrophysics and Associated Technologies
PFB-06
project Basal
PFB-06
U.S. Department of Energy
U.S. National Science Foundation
Ministry of Science and Education of Spain
Science and Technology Facilities Council of the United Kingdom
Higher Education Funding Council for England
National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign
Kavli Institute of Cosmological Physics at the University of Chicago
Center for Cosmology and Astro-Particle Physics at the Ohio State University
Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University
Financiadora de Estudos e Projetos
Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
Ministerio da Ciencia, Tecnologia e Inovacao
Deutsche Forschungsgemeinschaft
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Monthly Notices of The Royal Astronomical Society 474, 683–695 (2018)
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