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Stellar substructures in the galactic disc and halo: properties, origins, and evolution

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dc.contributor.author Deepak
dc.date.accessioned 2024-12-17T06:01:01Z
dc.date.available 2024-12-17T06:01:01Z
dc.date.issued 2024-12
dc.identifier.citation Journal of Astrophysics and Astronomy, Vol. 45, No. 2, 25 en_US
dc.identifier.issn 0973-7758
dc.identifier.uri http://hdl.handle.net/2248/8611
dc.description Restricted Access en_US
dc.description The original publication is available at springerlink.com
dc.description.abstract Spatial, kinematic, and orbital properties, along with ages and chemical compositions of the thin disc, thick disc, and various stellar substructures in the halo, are studied based on data from the LAMOST and Gaia surveys. The star formation in the Galactic thin and thick disc, with peak metallicities of ‑ 0.20 and ‑ 0.45 dex, is found to have peaked about 5.5 and 12.5 Gyr ago, respectively. The thin disc is also found to have experienced an initial star formation burst about 12.5 Gyr ago. The pro-grade population Splash and hot-disc (HD), with peak metallicity of about ‑ 0.60 and ‑ 0.43, are found to be about 13.03 and 12.21 Gyr old, respectively, with peak eccentricity of 0.70 and 0.35, are understood to be of in situ origin. The Gaia-Enceladus/Sausage (GE/S), Thamnos and Sequoia, with peak metallicity of about ‑ 1.31, ‑ 1.36, and ‑ 1.56, are found to be about 11.66, 12.89, and 12.18 Gyr, respectively, and are understood to be remnants of dwarf galaxies merged with the Milky Way. The HD, Splash, and Thamnos have experienced chemical evolution similar to the thick disc, while GE/S, Sequoia, and Helmi stream have experienced distinct chemical enrichment of iron and α-process elements. en_US
dc.language.iso en en_US
dc.publisher Springer Nature en_US
dc.relation.uri https://doi.org/10.1007/s12036-024-10011-1
dc.rights © Indian Academy of Sciences
dc.subject Surveys en_US
dc.subject Galaxy: stellar content en_US
dc.subject Galaxy:evolution en_US
dc.subject Galaxy:formation en_US
dc.subject Galaxy:kinematics and dynamics en_US
dc.subject Thin and thick disc en_US
dc.title Stellar substructures in the galactic disc and halo: properties, origins, and evolution en_US
dc.type Article en_US


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