The VISCACHA survey: III. Star clusters counterpart of the Magellanic Bridge and Counter-Bridge in 8D

Autor(es):Mostrar menos -

Dias, B. ^[1] ; Angelo, M. S. ^[2] ; Oliveira, R. A. P. ^[3] ; Maia, F. ^[4] ; Parisi, M. C. ^{[5, 6]} ; De Bortoli, B. ^{[7, 8, 9]} ; Souza, S. O. ^[3] ; Katime Santrich, O. J. ^[10] ; Bassino, L. P. ^{[7, 8, 9]} ; Barbuy, B. ^[3] ; Bica, E. ^[11] ; Geisler, D. ^{[12, 13, 14]} ; Kerber, L. ^[10] ; Perez-Villegas, A. ^{[3, 15]} ; Quint, B. ^[16] ; Sanmartim, D. ^[17] ; Santos, Jr., J. F. C. ^[18] ; Westera, P. ^[19]

Afiliação do(s) autor(es):Mostrar menos -

^[1] Univ Tarapaca, Inst Alta Invest, Sede Esmeralda, Av Luis Emilio Recabarren 2477, Iquique - Chile

^[2] Ctr Fed Educ Tecnol Minas Gerais, Av Monsenhor Luiz Gonzaga 103, BR-37250000 Nepomuceno, MG - Brazil

^[3] Univ Sao Paulo, IAG, Rua Matao 1226, Cidade Univ, BR-05508900 Sao Paulo - Brazil

^[4] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil

^[5] Univ Nacl Cordoba, Observ Astron, Laprida 854, X5000BGR, Cordoba - Argentina

^[6] Inst Astron Teor & Expt CONICET UNC, Laprida 854, X5000BGR, Cordoba - Argentina

^[7] Consejo Nacl Invest Cient & Tecn, Godoy Cruz 2290, C1425FQB, Buenos Aires, DF - Argentina

^[8] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, Paseo Bosque S-N, B1900FWA, La Plata - Argentina

^[9] Univ Nacl La Plata, Inst Astrofis La Plata, CCT La Plata CONICET UNLP, Paseo Bosque S-N, B1900FWA, La Plata - Argentina

^[10] Univ Estadual Santa Cruz, Dept Ciencias Exatas & Tecnol, Rodovia Jorge Amado Km 16, BR-45662900 Ilheus, BA - Brazil

^[11] Univ Fed Rio Grande do Sul, Dept Astron, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil

^[12] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion - Chile

^[13] Univ La Serena, Dept Fis & Astron, Ave Juan Cisternas 1200, La Serena - Chile

^[14] Univ La Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Benavente 980, La Serena - Chile

^[15] Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 106, Ensenada 22800, Baja California - Mexico

^[16] Gemini Observ, NSFs NOIRLab, Casilla 603, La Serena - Chile

^[17] La Campanas Observ, Carnegie Observ, Casilla 601, La Serena - Chile

^[18] ICEx UFMG, Dept Fis, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil

^[19] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Astronomy & Astrophysics; v. 647, MAR 17 2021.
• Citações Web of Science: 0

Resumo

Context. The interactions between the Small and Large Magellanic Clouds (SMC and LMC) created the Magellanic Bridge; a stream of gas and stars pulled out of the SMC towards the LMC about 150 Myr ago. The tidal counterpart of this structure, which should include a trailing arm, has been predicted by models but no compelling observational evidence has confirmed the Counter-Bridge so far.Aims. The main goal of this work is to find the stellar counterpart of the Magellanic Bridge and Counter-Bridge. We use star clusters in the SMC outskirts as they provide a 6D phase-space vector, age, and metallicity which help characterise the outskirts of the SMC.Methods. Distances, ages, and photometric metallicities were derived from fitting isochrones to the colour-magnitude diagrams from the VISCACHA survey. Radial velocities and spectroscopic metallicities were derived from the spectroscopic follow-up using GMOS in the CaII triplet region.Results. Among the seven clusters analysed in this work, five belong to the Magellanic Bridge, one belongs to the Counter-Bridge, and the other belongs to the transition region.Conclusions. The existence of the tidal counterpart of the Magellanic Bridge is evidenced by star clusters. The stellar component of the Magellanic Bridge and Counter-Bridge are confirmed in the SMC outskirts. These results are an important constraint for models that seek to reconstruct the history of the orbit and interactions between the LMC and SMC as well as constrain their future interaction including with the Milky Way. (AU)

• Processo FAPESP: 18/22044-3 - Aglomerados globulares do bojo: relíquias da formação e evolução da galáxia
• Beneficiário: Stefano Oliveira de Souza
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 18/22181-0 - Gradientes de idade e metalicidade dos aglomerados estelares da Ponte de Magalhães
• Beneficiário: Raphael Augusto Pereira de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado