Star formation history of KDG61 and KDG64 from spectroscopy and colour-magnitude diagrams

Bibcode
2010MNRAS.406.1152M
DOI
10.1111/j.1365-2966.2010.16746.x
Makarova, Lidia; Koleva, M.; Makarov, Dmitry; Prugniel, Philippe
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 406, Issue 2, pp. 1152-1165.

Advertised on:
8
2010
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
4
IAC number of authors
1
Citations
25
Refereed citations
23
Description
A study of two dE/dSph members of the nearby M81 group of galaxies, KDG61 and UGC5442 = KDG64, has been made. Direct Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) images and integrated-light spectra of 6-m telescope of Special Astrophysical Observatory of Russian Academy of Sciences have been used for quantitative star formation history analysis. The spectroscopic and colour-magnitude diagrams analysis gives consistent results. These galaxies appear to be dominated by an old population (12-14Gyr) of low metallicity ([Fe/H] ~ -1.5). Stars of ages about 1-4Gyr have been detected in both galaxies. The later population shows marginal metal enrichment. We do not detect any significant radial gradients in age or metallicity in these galaxies. Our radial velocity measurement suggests that the HII knot on the line-of-sight of KDG61 is not gravitationally attached to the galaxy.
Related projects
Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology

We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.

Ignacio
Martín Navarro
In progress
Type
Refereed
Galaxies

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