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Edge-on thick discsтезисы доклада Тезисы
- Авторы: Kasparova A., Katkov I., Chilingarian I., Silchenko O., Moiseev A., Borisov S.
- Сборник: Proceeding of the conference The Interplay between Local and Global Processes in Galaxies
- Тезисы
- Год издания: 2016
- Место издания: Cozumel, Mexico
- Аннотация: Although thick stellar discs are detected in nearly all edge-on disc galaxies, their formation scenarios still remain a matter of debate. Due to observational difficulties, there is a lack of information about their stellar populations. Using the Russian 6-m telescope BTA we collected deep spectra of thick discs in three edge-on early-type disc galaxies located in different environments: NGC4111 in a dense group, NGC4710 in the Virgo cluster, and NGC5422 in a sparse group. We see intermediate age (4 ‑ 5 Gyr) metal rich ([Fe/H] ~ ‑0.2 ‑ 0.0 dex) stellar populations in NGC4111 and NGC4710. On the other hand, NGC5422 does not harbour young stars, its only disc is thick and old (10 Gyr) and its α-element abundance suggests a long formation epoch implying its formation at high redshift. Our results prove the diversity of thick disc formation scenarios.
- Добавил в систему: Каспарова Анастасия Владиленовна