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FIRST RESULTS FROM THE NOAO SURVEY OF THE OUTER LIMITS OF THE MAGELLANIC CLOUDS
Indexado
WoS WOS:000284143500010
Scopus SCOPUS_ID:78649861075
DOI 10.1088/0004-6256/140/6/1719
Año 2010
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



We describe the first results from the Outer Limits Survey, an NOAO survey designed to detect, map, and characterize the extended structure of the Large and Small Magellanic Clouds (LMC and SMC). The survey consists of deep images of 55 0 degrees.6 x 0 degrees.6 fields distributed at distances up to 20 degrees from the Clouds, with 10 fields at larger distances representing controls for contamination by Galactic foreground stars and background galaxies. The field locations probe the outer structure of both the LMC and SMC, as well as exploring areas defined by the Magellanic Stream, the Leading Arm, and the LMC orbit as recently measured from its proper motion. The images were taken with C, M, R, I, and DDO51 filters on the CTIO Blanco 4 m telescope and Mosaic2 camera, with supporting calibration observations taken at the CTIO 0.9m telescope. The CRI images reach depths below the oldest main-sequence (MS) turnoffs at the distance of the Clouds, thus yielding numerous probes of structure combined with good ability to measure stellar ages and metallicities. The M and DDO51 images allow for discrimination of LMC and SMC giant stars from foreground dwarfs, allowing us to use giants as additional probes of Cloud structure and populations. From photometry of eight fields located at radii of 7 degrees-19 degrees north of the LMC bar, we find MS stars associated with the LMC out to 16 degrees from the LMC center, while the much rarer giants can only be convincingly detected out to 11 degrees. In one field, designated as a control, we see the unmistakable signature of the Milky Way (MW) globular cluster NGC 1851, which lies several tidal radii away from the field center. The color-magnitude diagrams show that while at 7 degrees radius LMC populations as young as 500 Myr are present, at radii greater than or similar to 11 degrees only the LMC's underlying old metal-poor ([M/H]similar to - 1) population remains, demonstrating the existence of a mean population gradient at these radii. Nevertheless, even at extreme large distances, the dominant age is significantly younger than that of the Galactic globular clusters. The MS star counts follow an exponential decline with distance with a scale length of 1.15 kpc, essentially the same scale length as gleaned for the inner LMC disk from prior studies. While we cannot rule out the existence of undetected tidal features elsewhere in the LMC periphery, the detection of an ordered structure to 12 disk scale lengths is unprecedented and adds to the puzzle of the LMC's interaction history with the SMC and the MW. Our results do not rule out the possible existence of an LMC stellar halo, which we show may only begin to dominate over the disk at still larger radii than where we have detected LMC populations.

Revista



Revista ISSN
Astronomical Journal 0004-6256

Métricas Externas



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Disciplinas de Investigación



WOS
Astronomy & Astrophysics
Scopus
Sin Disciplinas
SciELO
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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Saha, Abhijit - Natl Opt Astron Observ - Estados Unidos
National Optical Astronomy Observatory - Estados Unidos
2 Olszewski, Edward W. W. Hombre UNIV ARIZONA - Estados Unidos
The University of Arizona - Estados Unidos
3 Brondel, Brian Hombre Indiana Univ - Estados Unidos
Indiana University Bloomington - Estados Unidos
4 Olsen, Knut A. G. Hombre Natl Opt Astron Observ - Estados Unidos
National Optical Astronomy Observatory - Estados Unidos
5 Knezek, Pat Mujer Natl Opt Astron Observ - Estados Unidos
National Optical Astronomy Observatory - Estados Unidos
6 Harris, J. Hombre Natl Opt Astron Observ - Estados Unidos
National Optical Astronomy Observatory - Estados Unidos
7 Smith, Chris Hombre Natl Opt Astron Observ - Chile
Cerro Tololo Inter American Observatory - Chile
National Optical Astronomy Observatory - Chile
8 Subramaniam, Annapurni - Indian Inst Astrophys - India
Indian Institute of Astrophysics - India
9 Claver, Jennifer Mujer Natl Opt Astron Observ - Estados Unidos
National Optical Astronomy Observatory - Estados Unidos
10 Rest, A. Hombre Natl Opt Astron Observ - Chile
Cerro Tololo Inter American Observatory - Chile
Harvard University - Estados Unidos
STScI - Estados Unidos
National Optical Astronomy Observatory - Chile
Space Telescope Science Institute - Estados Unidos
11 Seitzer, Patrick Hombre UNIV MICHIGAN - Estados Unidos
University of Michigan, Ann Arbor - Estados Unidos
12 Cook, Kem - Lawrence Livermore Natl Lab - Estados Unidos
Lawrence Livermore National Laboratory - Estados Unidos
13 MINNITI-DEL BARCO, DANTE Hombre Pontificia Universidad Católica de Chile - Chile
Vatican Observ - Vaticano
Centro de Excelencia en Astrofísica y Tecnologías Afines - Chile
Vatican Observatory - Italia
14 Suntzeff, N. B. Hombre Texas A&M Univ - Estados Unidos
Texas A&M University - Estados Unidos

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Origen de Citas Identificadas



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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 33.71 %
Citas No-identificadas: 66.28999999999999 %

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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 33.71 %
Citas No-identificadas: 66.28999999999999 %

Financiamiento



Fuente
National Science Foundation
NSF
BASAL CATA
NOAO
FONDAP CFA
Indiana Space Grant Consortium

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Agradecimientos



Agradecimiento
We thank the CTIO staff, especially the telescope operators and technical staff, for their help on the many observing runs. We also thank the NOAO archive group for making it easy to retrieve our data from the Tucson archive, and for their help with getting our final processed images ready for the public archive. A. Saha thanks Frank Valdes for illuminating discussions about image processing in general, and IRAF help in particular. E.O. acknowledges the NSF Grant AST-0807498. B.B. gratefully acknowledges fellowship support from the Indiana Space Grant Consortium. D. M. is supported by grants from FONDAP CFA 15010003, BASAL CATA PFB-06, and MIDEPLANMWMP07-021-F.A.R. thanks the NOAO Goldberg Fellowship Program for its support.

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