Query : 2006A&A...447..843T

2006A&A...447..843T - Astronomy and Astrophysics, volume 447, 843-861 (2006/3-1)

Interpreting the galaxy group CG J1720-67.8 through evolutionary synthesis models.


Abstract (from CDS):

This paper is part of a series devoted to a detailed analysis of the properties of the compact group CG J1720-67.8 and its member galaxies with the aim of shedding light on its evolutionary history. Here we interpret our previously published observational results through comparison with chemically consistent spectrophotometric evolutionary synthesis models to gain further clues to the evolution of the galaxies in this group. In order to reduce the number of free parameters, we considered the simplest case of a single burst of star-formation turned on after 11-12Gyr of undisturbed galaxy evolution. However, we also briefly explored the effect of multiple, interaction-induced bursts of star-formation. We found that the two spiral galaxies are consistent with interaction-induced strong starbursts switched on ∼40 to 180Myr ago and still active. For the early-type galaxy, a ≲0.9-1.3Gyr old star-formation event (depending on the considered model) appears consistent with the observed properties. The comparison with models cannot rule out the possibility that this galaxy is already the result of a merger. Alternatively, a star-formation episode in this galaxy might have been triggered by gas inflow as a consequence of the interaction with the companion galaxies. Estimates of galaxy masses were derived from the comparison with the models. Finally our results are discussed in comparison with other well-studied, poor galaxy systems.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: interactions - galaxies: starburst

CDS comments: Fig.1 star s not in Simbad.

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 HCG 31 CGG 05 01 37 -04 15.4           ~ 128 0
2 AM 1238-362 G 12 40 52.3 -36 45 16           ~ 2 1
3 [WTK99] CG J1720-678 GrG 17 20 -67.8           ~ 20 0
4 [WTK99] Object 1a GiG 17 20 27 -67 46.3           ~ 2 0
5 [WTK99] Object 1 GiG 17 20 27.8 -67 46 21           ~ 6 0
6 [WTK99] Object 4 GiG 17 20 28.7 -67 46 31           ~ 6 0
7 2MASX J17202890-6746248 G 17 20 28.8971875344 -67 46 24.857223348   16.74   15.31   ~ 8 0

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