2021MNRAS.502.1623M

Query : 2021MNRAS.502.1623M

2021MNRAS.502.1623M - Mon. Not. R. Astron. Soc., 502, 1623-1632 (2021/April-1)

Spatial segregation impact on star formation in nearby dwarf spheroidal galaxies.

MAKAROVA L.N. and MAKAROV D.I.

Abstract (from CDS):

Using our Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) observations of the recently found isolated dwarf spheroidal (dSph) 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 (LG) virial radius (but within the LG zero-velocity sphere); and the satellites of M 31 located within the virial zone (300 kpc). Using archival HST/ACS observations, we measured their SFHs. A comparative analysis of the parameters obtained allow us to distinguish a possible effect of the spatial segregation on the dSphs evolution scenario.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - Local Group - galaxies: stellar content

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME M31 Group GrG 00 47 28.6 +40 17 23           ~ 65 0
4 LEDA 9140 G 02 24 40.9 -73 30 48   16.0       ~ 41 0
5 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
6 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 274 0
7 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 115 0
8 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
9 ESO 468-20 G 22 40 43.6 -30 47 55   15.88   15.13   ~ 45 0
10 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
11 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
12 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
13 NAME MW Group GrG ~ ~           ~ 22 0
14 NAME Local Group GrG ~ ~           ~ 9325 0

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