Spatial segregation impact on star formation in nearby dwarf spheroidal galaxies. (arXiv:2101.08613v1 [astro-ph.GA])

Spatial segregation impact on star formation in nearby dwarf spheroidal galaxies. (arXiv:2101.08613v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Makarova_L/0/1/0/all/0/1">L. N. Makarova</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Makarov_D/0/1/0/all/0/1">D. I. Makarov</a>

Using our HST/ACS observations of the recently found isolated dwarf
spheroidal galaxies, we homogeneously measured their star formation histories.
We determined star formation rate as a function of time, as well as age and
metallicity of the stellar populations. All objects demonstrate complex star
formation history, 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 star formation 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 Local Group zero
velocity sphere); and the satellites of M 31 located within the virial zone
(300 kpc). Using archival HST/ACS observations, we measured their star
formation histories. A comparative analysis of the parameters obtained allow us
to distinguish a possible effect of the spatial segregation on the dSphs
evolution scenario.

Using our HST/ACS observations of the recently found isolated dwarf
spheroidal galaxies, we homogeneously measured their star formation histories.
We determined star formation rate as a function of time, as well as age and
metallicity of the stellar populations. All objects demonstrate complex star
formation history, 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 star formation 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 Local Group zero
velocity sphere); and the satellites of M 31 located within the virial zone
(300 kpc). Using archival HST/ACS observations, we measured their star
formation histories. A comparative analysis of the parameters obtained allow us
to distinguish a possible effect of the spatial segregation on the dSphs
evolution scenario.

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