2006A&A...459..423B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET04:52:52

2006A&A...459..423B - Astronomy and Astrophysics, volume 459, 423-440 (2006/11-4)

The DART imaging and CaT survey of the Fornax dwarf spheroidal galaxy.

BATTAGLIA G., TOLSTOY E., HELMI A., IRWIN M.J., LETARTE B., JABLONKA P., HILL V., VENN K.A., SHETRONE M.D., ARIMOTO N., PRIMAS F., KAUFER A., FRANCOIS P., SZEIFERT T., ABEL T. and SADAKANE K.

Abstract (from CDS):

As part of the DART project we have used the ESO/2.2m Wide Field Imager in conjunction with the VLT/FLAMES GIRAFFE spectrograph to study the detailed properties of the resolved stellar population of the Fornax dwarf spheroidal galaxy out to and beyond its tidal radius. Fornax dwarf spheroidal galaxy has had a complicated evolution and contains significant numbers of young, intermediate age and old stars. We investigate the relation between these different components by studying their photometric, kinematic and abundance distributions. We re-derived the structural parameters of the Fornax dwarf spheroidal using our wide field imaging covering the galaxy out to its tidal radius, and analysed the spatial distribution of the Fornax stars of different ages as selected from colour-magnitude diagram analysis. We have obtained accurate velocities and metallicities from spectra in the Ca II triplet wavelength region for 562 Red Giant Branch stars which have velocities consistent with membership of the Fornax dwarf spheroidal. We have found evidence for the presence of at least three distinct stellar components: a young population (few 100Myr old) concentrated in the centre of the galaxy, visible as a Main Sequence in the colour-magnitude diagram; an intermediate age population (2-8Gyr old); and an ancient population (>10Gyr), which are distinguishable from each other kinematically, from the metallicity distribution and in the spatial distribution of stars found in the colour-magnitude diagram. From our spectroscopic analysis we find that the ``metal rich'' stars ([Fe/H]>-1.3) show a less extended and more concentrated spatial distribution, and display colder kinematics than the ``metal poor'' stars ([Fe/H]←1.3). There is tentative evidence that the ancient stellar population in the centre of Fornax does not exhibit equilibrium kinematics. This could be a sign of a relatively recent accretion of external material, such as the merger of another galaxy or other means of gas accretion at some point in the fairly recent past, consistent with other recent evidence of substructure (Coleman et al., 2004AJ....127..832C, 2005AJ....129.1443C).

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: individual: Fornax - galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: Local Group - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/459/423): table4.dat>

Nomenclature: Table 4: [BTH2006] fnx-NN NNN N=383, [BTH2006] ETNNN N=257 among (Nos 007-327).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 839 1
2 NAME Fornax H1 Cl* 02 37 02.1 -34 11 00     16.59     ~ 96 0
3 NAME Fornax H2 GlC 02 38 44.24 -34 48 30.5   14.5       ~ 84 0
4 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 113 0
5 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1519 1
6 NAME Fornax H4 GlC 02 40 07.697 -34 32 10.59   15.18 13.91 14.08   ~ 99 0
7 NAME Fornax H5 GlC 02 42 21.111 -34 06 05.80   14.5       ~ 90 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5868 1
9 SA 95- reg 03 53 21.0 -00 01 10           ~ 83 0
10 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1016 0
11 SA 98- reg 06 52 04.1 -00 23 58           ~ 166 0
12 RL 149 HS* 07 24 14.3741222640 -00 33 04.164965943 12.958 13.737 13.866 13.906 13.974 sdB 110 0
13 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
14 PG 1323-086 HS* 13 25 39.4670509324 -08 49 19.068159971 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 136 1
15 SA 107- reg 15 39.2 -00 20           ~ 89 0
16 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1196 1
17 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1814 2
18 NAME Local Group GrG ~ ~           ~ 7188 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-04:52:52

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