2011A&A...530A..59C


Query : 2011A&A...530A..59C

2011A&A...530A..59C - Astronomy and Astrophysics, volume 530A, 59-59 (2011/6-1)

A close look at the Centaurus A group of galaxies. III. Recent star formation histories of late-type dwarfs around M 83.

CRNOJEVIC D., GREBEL E.K. and COLE A.A.

Abstract (from CDS):

We study the resolved stellar populations of dwarf galaxies in the nearby Centaurus A/M 83 group of galaxies. Our goal is to characterize their evolutionary history and to investigate eventual similarities or differences with the dwarf population in other group environments.This work presents the analysis of five late-type (irregular) dwarfs found in the vicinity of the giant spiral M 83. Using archival HST/ACS data, we perform synthetic color-magnitude diagram modeling to derive the star formation histories of these late-type dwarfs.The target objects show heterogeneous star formation histories, with average star formation rates of 0.08 to 0.70x10–2M/yr. Some of them present prolonged, global bursts of star formation (∼300-500Myr). The studied galaxies are all metal-poor ([Fe/H]~-1.4). We further investigate the spatial extent of different stellar populations, finding that the young stars show a clumpy distribution, as opposed to the smooth, broad extent of the old ones. The actively star forming regions have sizes of ∼100pc and lifetimes of >100Myr, thus suggesting a stochastic star formation mode for the target dwarf irregular galaxies. The galaxies formed ∼20% to 70% of their stars more than ∼7Gyr ago.The studied dwarfs have average star formation rates slightly higher than their analogues in the Local Group, but comparable to those in the M 81 group. Our preliminary sample indicates that the neutral gas content of the target dwarfs does seem to be affected by the group environment: galaxies within a denser region have a much lower MHI/<SFR> than the isolated ones, meaning that they will exhaust their gas reservoir more quickly.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: photometry - galaxies: stellar content - galaxies: groups: individual: CenA group

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 - 2021
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1036 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11380 1
3 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 472 0
4 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 368 0
5 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1139 2
6 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 482 2
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5999 1
8 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1626 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15473 1
10 NAME M 81-82 Group GrG 09 55 +69.1           ~ 651 0
11 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4070 5
12 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 561 0
13 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1096 1
14 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 672 2
15 ESO 318-18 IG 10 49 45.223 -42 19 25.81   17.28   15.69   ~ 4 0
16 ESO 318-20 IG 10 51 45.736 -41 51 42.48   15.84   14.32   ~ 9 0
17 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 767 0
18 ESO 381-18 G 12 44 42.5 -35 58 01   15.79   14.84 15.1 ~ 49 0
19 ESO 381-20 G 12 46 00.4 -33 50 17   14.24   13.50 14.0 ~ 77 0
20 ESO 443-9 G 12 54 54.0 -28 20 27   17.01   16.35   ~ 38 0
21 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 238 0
22 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4110 3
23 IC 4247 GiC 13 26 44.9 -30 21 45 15.34 14.67 14.28 14.13   ~ 77 0
24 ESO 444-78 GiC 13 36 30.8 -29 14 03   15.49   14.81 15.0 ~ 77 0
25 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2310 2
26 NAME NGC 5236 Group GrG 13 37 06 -29 51.9           ~ 58 0
27 NAME Carina Region reg ~ ~           ~ 167 0
28 NAME Local Group GrG ~ ~           ~ 7321 0

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2021.08.04-00:11:52

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