2001AJ....122.3092H


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST13:48:55

2001AJ....122.3092H - Astron. J., 122, 3092-3105 (2001/December-0)

Population gradients in Local Group dwarf spheroidal galaxies.

HARBECK D., GREBEL E.K., HOLTZMAN J., GUHATHAKURTA P., BRANDNER W., GEISLER D., SARAJEDINI A., DOLPHIN A., HURLEY-KELLER D. and MATEO M.

Abstract (from CDS):

We present a systematic and homogeneous analysis of population gradients for the Local Group dwarf spheroidal galaxies (dSph's) Carina, Sculptor, Sextans, Tucana, and Andromeda I-III, V, and VI. For all of the Milky Way companions studied here, we find significant population gradients. The same is true for the remote dSph Tucana located at the outskirts of the Local Group. Among the M31 dSph companions, only Andromeda I and VI show obvious gradients. In all cases where a horizontal-branch (HB) morphology gradient is visible, the red HB stars are more centrally concentrated. The occurrence of a HB morphological gradient shows a correlation with a morphology gradient in the red giant branch. It seems likely that metallicity is the driver of the gradients in Sextans, Sculptor, Tucana, and Andromeda VI, while age is an important factor in Carina. We find no evidence that the vicinity of a nearby massive spiral galaxy influences the formation of the population gradients.

Abstract Copyright:

Journal keyword(s): Galaxies: Dwarf - Galaxies: Stellar Content - Galaxies: Structure - Galaxies: Local Group - Stars: Abundances - Stars: Horizontal-Branch

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 - 2019
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3462 0
2 NAME Andromeda III G 00 35 22.7 +36 30 17     14.4     ~ 259 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10562 1
4 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 292 0
5 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1062 4
6 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 179 0
7 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 326 0
8 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 431 2
9 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1405 1
10 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1206 0
11 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 954 0
12 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 667 0
13 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1763 0
14 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2842 0
15 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 255 0
16 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 201 0
17 NAME Peg dSph GiG 23 51 46.4 +24 35 11   14.5 13.2     ~ 207 2
18 NAME Local Group GrG ~ ~           ~ 6659 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-13:48:55

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