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Ages, metallicities and structure of stellar clusters in the Magellanic Bridge

Published online by Cambridge University Press:  30 October 2025

Raphael A. P. Oliveira Open the ORCID record for Raphael A. P. Oliveira [Opens in a new window] ,
Francisco F. S. Maia Open the ORCID record for Francisco F. S. Maia [Opens in a new window] ,
Beatriz Barbuy ,
Bruno Dias  and
the VISCACHA collaboration
Raphael A. P. Oliveira*
Affiliation:
Universidade de São Paulo, IAG, Rua do Matão 1226, São Paulo 05508-090, Brazil
Francisco F. S. Maia
Affiliation:
Universidade Federal do Rio de Janeiro, Av. Athos da Silveira, 149, Rio de Janeiro 21941-909, Brazil
Beatriz Barbuy
Affiliation:
Universidade de São Paulo, IAG, Rua do Matão 1226, São Paulo 05508-090, Brazil
Bruno Dias
Affiliation:
Instituto de Alta Investigación, Sede Esmeralda, Universidad de Tarapacá, Av. Luis Emilio Recabarren 2477, Iquique, Chile
*
email: rap.oliveira@usp.br
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Abstract

The formation of the Magellanic Bridge during an encounter between the Magellanic Clouds ∼ 200 Myr ago would be imprinted in the chemical evolution and kinematics of its stellar population, with sites of active star formation. Since it contains hundreds of stellar clusters and associations, we combined deep photometry from VISCACHA and SMASH surveys to explore this topic, by deriving structural parameters, age, metallicity, distance and mass for 33 Bridge clusters with robust statistical tools. We identified a group of 13 clusters probably stripped from the Small Magellanic Cloud (0.5 − 4.7 Gyr, [Fe/H] < −0.6 dex) and another 15 probably formed in-situ (< 200 Myr, [Fe/H] ∼ −0.4 dex). Two metallicity dips were detected in the age-metallicity relation, coeval to the Stream and Bridge formation epochs. Cluster masses range from 500 to ∼ 104 M⊙, and a new estimate of 3 − 5 × 105 M⊙ is obtained for the Bridge stellar mass.

Keywords

Magellanic Cloudsgalaxies: evolutiongalaxies: star clusters: general

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 216 - 220
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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