2013A&A...551A.103D


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.25CET10:57:56

2013A&A...551A.103D - Astronomy and Astrophysics, volume 551A, 103-103 (2013/3-1)

A new study of stellar substructures in the Fornax dwarf spheroidal galaxy.

DE BOER T.J.L., TOLSTOY E., SAHA A. and OLSZEWSKI E.W.

Abstract (from CDS):

Using deep V, B-V wide-field photometry, we have conducted a new study of stellar over-densities in the Fornax dwarf spheroidal galaxy by determining detailed star formation histories from colour-magnitude diagram analysis. We have concentrated on the relatively young stellar component (<4Gyr old), and compared this to the underlying Fornax field population. We have studied in more detail the previously known inner shell-like structure and shown that it has a well-defined age-metallicity relation with a peak at ≃1.5Gyr, [Fe/H]=-0.6dex. Comparison to the Fornax centre shows that the over-dense feature is consistent with the age-metallicity relation of young field stars, and likely formed from Fornax gas. This is consistent with a scenario in which the over-density was formed by the re-accretion of previously expelled gas. We have also discovered a new stellar over-density, located 0.3 degrees (0.7kpc) from the centre, which is only 100Myr old, with solar metallicity. This feature constitutes some of the youngest, most metal-rich stars stars observed in Fornax to date. It is unclear how the young over-density was formed, although the age and metallicity of stars suggest this feature may represent the last star formation activity of the Fornax dSph.

Abstract Copyright:

Journal keyword(s): galaxies: stellar content - galaxies: evolution - Local Group - Hertzsprung-Russell and C-M diagrams

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1440 1
2 NAME Fornax H4 GlC 02 40 07.697 -34 32 10.59   15.18 13.91 14.08   ~ 94 0
3 NAME Local Group GrG ~ ~           ~ 6803 0

    Equat.    Gal    SGal    Ecl

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2020.02.25-10:57:56

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