A megacam survey of outer halo satellites. I. description of the survey
Author
dc.contributor.author
Muñoz Vidal, Ricardo Rodrigo
Author
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Cote, Patrick
Author
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Santana, Felipe
Author
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Geha, Marla
Author
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Simón, Joshua D.
Author
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Oyarzún, Grecco A.
Author
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Stetson, Peter B.
Author
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Djorgovski, S. G.
Admission date
dc.date.accessioned
2018-11-09T14:41:50Z
Available date
dc.date.available
2018-11-09T14:41:50Z
Publication date
dc.date.issued
2018-06-10
Cita de ítem
dc.identifier.citation
Astrophysical Journal Volumen: 860 Número: 1 Número de artículo: 65
es_ES
Identifier
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10.3847/1538-4357/aac168
Identifier
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https://repositorio.uchile.cl/handle/2250/152551
Abstract
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We describe a deep, systematic imaging study of satellites in the outer halo of the Milky Way. Our sample consists of 58 stellar overdensities-i.e., substructures classified as either globular clusters, classical dwarf galaxies, or ultra-faint dwarf galaxies-that are located at Galactocentric distances of R-GC >= 25 kpc (outer halo) and out to similar to 400 kpc. This includes 44 objects for which we have acquired deep, wide-field, g-and r-band imaging with the MegaCam mosaic cameras on the 3.6 m Canada-France-Hawaii Telescope and the 6.5 m Magellan-Clay telescope. These data are supplemented by archival imaging, or published gr photometry, for an additional 14 objects, most of which were discovered recently in the Dark Energy Survey (DES). We describe the scientific motivation for our survey, including sample selection, observing strategy, data reduction pipeline, calibration procedures, and the depth and precision of the photometry. The typical 5 sigma point-source limiting magnitudes for our MegaCam imaging-which collectively covers an area of approximate to 52 deg(2)-are g(lim) similar or equal to 25.6 and r(lim) similar or equal to 25.3 AB mag. These limits are comparable to those from the coadded DES images and are roughly a half-magnitude deeper than will be reached in a single visit with the Large Synoptic Survey Telescope. Our photometric catalog thus provides the deepest and most uniform photometric database of Milky Way satellites available for the foreseeable future. In other papers in this series, we have used these data to explore the blue straggler populations in these objects, their density distributions, star formation histories, scaling relations, and possible foreground structures.
es_ES
Patrocinador
dc.description.sponsorship
FONDECYT
1170364
National Science Foundation
AST-0908752
Alfred P. Sloan Foundation
NSF
AST-1313422
AST-1413600
AST-1518308
Ajax Foundation
BASAL PFB-06