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The spatial segregation impact on the star formation histories of nearby dwarf spheroidal galaxies

Published online by Cambridge University Press:  30 October 2019

Lidia Makarova Open the ORCID record for Lidia Makarova [Opens in a new window]  and
Dmitry Makarov
Lidia Makarova
Affiliation:
Special Astrophysical Observatory, Nizhniy Arkhyz, Karachai-Cherkessia 369167, Russia emails: lidia@sao.ru, dim@sao.ru
Dmitry Makarov
Affiliation:
Special Astrophysical Observatory, Nizhniy Arkhyz, Karachai-Cherkessia 369167, Russia emails: lidia@sao.ru, dim@sao.ru
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Abstract

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Using our HST/ACS observations of the recently found isolated dwarf spheroidal galaxies, we homogeneously measured their star formation histories (SFHs). We determined SF rate as a function of time, as well as age and metallicity of the stellar populations. All objects demonstrate complex SFH, with a significant portion of stars formed 10–13 Gyr ago. Nevertheless, stars of middle ages (1–8 Gyr) are presented. In order to understand how the SF parameters influence the evolution of dSphs, we also studied a sample of nearest dSphs in different environment: isolated (d < 2 Mpc); beyond the Local Group virial radius (but within the LG zero velocity sphere); and the satellites of M31 located within the virial zone (300 kpc). Using archival HST/ACS observations, we measured their SFHs. A comparative analysis of the parameters obtained give us a possibility to distinguish a possible effect of the spatial segregation on the dSphs evolution scenario.

Keywords

galaxies: dwarfgalaxies: stellar content(galaxies:) Local Groupgalaxies: evolutiongalaxies: individual (KKR 25, KKs 03, KK 258, And XVIII, Tucana, Cas dSph, And XXVIII, And XXIX)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 389 - 391
Copyright
© International Astronomical Union 2019 

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