1999MNRAS.307..619B

Query : 1999MNRAS.307..619B

1999MNRAS.307..619B - Mon. Not. R. Astron. Soc., 307, 619-636 (1999/August-2)

The Sagittarius Dwarf Galaxy Survey (SDGS) - II. The stellar content and constraints on the star formation history.

BELLAZZINI M., FERRARO F.R. and BUONANNO R.

Abstract (from CDS):

A detailed study of the star formation history of the Sagittarius dwarf spheroidal galaxy is performed through the analysis of data from the Sagittarius Dwarf Galaxy Survey (SDGS). Accurate statistical decontamination of the SDGS colour-magnitude diagrams (CMDs) allows us to obtain many useful constraints on the age and metal content of the Sgr stellar populations in three different regions of the galaxy.

A coarse metallicity distribution of Sgr stars is derived, ranging from [Fe/H]~-2.0 to [Fe/H]~-0.7, the upper limit being somewhat higher in the central region of the galaxy. A qualitative global fit to all the observed CMD features is attempted, and a general scheme for the star formation history of the Sgr dSph is derived. According to this scheme, star formation began at a very early time from a low metal content interstellar medium and lasted for severalGyr, coupled with progressive chemical enrichment. The star formation rate (SFR) had a peak from 8 to 10Gyr ago, when the mean metallicity was in the range -1.3≤[Fe/H]≤-0.7. After that maximum, the SFR rapidly decreased and a very low rate of star formation took place until ∼1-0.5Gyr ago.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): techniques: photometric - astronomical data bases: miscellaneous - surveys - stars: formation - galaxies: individual: Sgr dSph - Local Group

Simbad objects: 16

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Number of rows : 16
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 Cl Pal 1 GlC 03 33 20.04 +79 34 51.8   17.2       ~ 267 1
3 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
4 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
5 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
6 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
7 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 561 0
8 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
9 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
10 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
11 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
12 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 384 0
13 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
14 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
15 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
16 NAME Local Group GrG ~ ~           ~ 9325 0

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