2009A&A...506.1137C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST20:00:31

2009A&A...506.1137C - Astronomy and Astrophysics, volume 506, 1137-1146 (2009/11-2)

The metallicity gradient as a tracer of history and structure: the Magellanic Clouds and M33 galaxies.

CIONI M.-R.L.

Abstract (from CDS):

The stellar metallicity and its gradient place constraints on the formation and evolution of galaxies. This is a study of the metallicity gradient of the LMC, SMC and M33 galaxies derived from their asymptotic giant branch (AGB) stars.The [Fe/H] abundance was derived from the ratio between C- and M-type AGB stars and its variation analysed as a function of galactocentric distance. Galaxy structure parameters were adopted from the literature.The metallicity of the LMC decreases linearly as -0.047±0.003dex/kpc out to ∼8kpc from the centre. In the SMC, [Fe/H] has a constant value of ~-1.25±0.01dex up to ∼12kpc. The gradient of the M33 disc, until ∼9kpc, is -0.078±0.003dex/kpc while the outer disc/halo, out to ∼25kpc, has [Fe/H]~-1.7dex.The metallicity of the LMC, as traced by different populations, bears the signature of two major star forming episodes: the first one constituting a thick disc/halo population and the second one a thin disc and bar due to a close encounter with the Milky Way and SMC. The [Fe/H] of the recent episode supports an LMC origin for the Stream. The metallicity of the SMC supports star formation, ∼3Gyr ago, as triggered by LMC interaction and sustained by the bar in the outer region of the galaxy. The SMC [Fe/H] agrees with the present-day abundance in the Bridge and shows no significant gradient. The metallicity of M33 supports an ``inside-out'' disc formation via accretion of metal poor gas from the interstellar medium.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - Magellanic Clouds - Local Group - stars: AGB and post-AGB - galaxies: stellar content - galaxies: individual: M33

Simbad objects: 28

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Number of rows : 28

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 WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 575 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1008 0
3 NAME Magellanic Stream HVC 00 32 -30.0           ~ 812 1
4 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 621 1
5 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 728 1
6 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1207 1
7 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10902 1
8 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
9 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1305 2
10 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 462 0
11 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1116 4
12 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1106 2
13 NAME SMC Bar PoG 01 05 -72.6           ~ 199 0
14 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5134 1
15 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
16 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
17 NAME Magellanic Bridge HI 03 11 -77.5           ~ 332 1
18 NAME LMC Bar ? 05 22 08 -69 23.5           ~ 258 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
20 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 693 2
21 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1045 1
22 UGC 9240 G 14 24 43.0755108543 +44 31 31.754423687 14.24 13.54 13.17 13.07   ~ 180 0
23 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 275 1
24 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1428 0
25 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 394 1
26 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 420 1
27 NAME Galactic Bulge reg ~ ~           ~ 3387 0
28 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-20:00:31

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