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A stellar overdensity associated with the Small Magellanic Cloud

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., Noel, Noelia, Majewski, S. R., Cioni, M.-R. L., Li, T. S., Hartley, W., Luque, E., Conn, B. C., Walker, A. R., Balbinot, Eduardo, 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. and Wester, W. (2017) A stellar overdensity associated with the Small Magellanic Cloud Monthly Notices of the Royal Astronomical Society, 468 (2). pp. 1349-1360.

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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 < rh) = 31.2 mag arcsec−2. We estimate a stellar mass of ∼105 M⊙, following a Kroupa mass function. The SMCNOD was probably removed from the SMC disc by tidal stripping, since it is located near the head of the Magellanic Stream, and the literature indicates likely recent Large Magellanic Cloud-SMC encounters. This scenario is supported by the lack of significant H I gas. Other potential scenarios for the SMCNOD origin are a transient overdensity within the SMC tidal radius or a primordial SMC satellite in advanced stage of disruption.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
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.
Majewski, S. R.
Cioni, M.-R. L.
Li, T. S.
Hartley, W.
Luque, E.
Conn, B. C.
Walker, A. R.
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.
Date : 28 February 2017
DOI : 10.1093/mnras/stx507
Copyright Disclaimer : © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Uncontrolled Keywords : Galaxies: interactions. Magellanic Clouds.
Depositing User : Clive Harris
Date Deposited : 14 Nov 2017 08:44
Last Modified : 16 Jan 2019 19:04

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