A stellar overdensity associated with the Small Magellanic Cloud

Abstract We report the discovery of a stellar overdensity 8° north of the centre of the Small Magellanic Cloud (SMC; Small Magellanic Cloud Northern Over-Density; SMCNOD), using data from the first 2 yr of the Dark Energy Survey (DES) and the first year of the MAGellanic SatelLITEs Survey (MagLiteS)...

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Veröffentlicht in:	Mon.Not.Roy.Astron.Soc 2017-06, Vol.468 (2), p.1349-1360
Hauptverfasser:	Pieres, A., Santiago, B. X., Drlica-Wagner, A., Bechtol, K., Marel, R. P. van der, Besla, G., Martin, N. F., Belokurov, V., Gallart, C., Martinez-Delgado, D., Marshall, J., Nöel, N. E. D., Majewski, S. R., Cioni, M.-R. L., Li, T. S., Hartley, W., Luque, E., Conn, B. C., Walker, A. R., Balbinot, E., Stringfellow, G. S., Olsen, K. A. G., Nidever, D., da Costa, L. N., Ogando, R., Maia, M., Neto, A. Fausti, Abbott, T. M. C., Abdalla, F. B., Allam, S., Annis, J., Benoit-Lévy, A., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Cunha, C. E., D'Andrea, C. B., Desai, S., Diehl, H. T., Doel, P., Flaugher, B., Fosalba, P., García-Bellido, J., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D., Kuehn, K., Kuropatkin, N., Menanteau, F., Miquel, R., Plazas, A. A., Romer, A. K., Sako, M., Sanchez, E., Scarpine, V., Schubnell, M., Sevilla-Noarbe, I., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M. E. C., Tarle, G., Tucker, D. L., Wester, W.
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTRONOMY AND ASTROPHYSICS Astrophysics Galaxies galaxies: interactions Magellanic Clouds Physics
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Zusammenfassung:	Abstract We report the discovery of a stellar overdensity 8° north of the centre of the Small Magellanic Cloud (SMC; Small Magellanic Cloud Northern Over-Density; SMCNOD), using data from the first 2 yr of the Dark Energy Survey (DES) and the first year of the MAGellanic SatelLITEs Survey (MagLiteS). The SMCNOD is indistinguishable in age, metallicity and distance from the nearby SMC stars, being primarily composed of intermediate-age stars (6 Gyr, Z=0.001), with a small fraction of young stars (1 Gyr, Z=0.01). The SMCNOD has an elongated shape with an ellipticity of 0.6 and a size of ∼ 6° × 2°. It has an absolute magnitude of MV ≅ −7.7, rh = 2.1 kpc, and μV(r
ISSN:	0035-8711 1365-2966
DOI:	10.1093/mnras/stx507