Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.132h&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
The centers of galaxy clusters are the places of the highest galaxy density in the universe. In particular, dwarf ellipticals (dE) are the most strongly clustered galaxies in high-density environments. Several striking characteristics are seen in the center region of clusters: (1) most central galaxies possess extraordinarily rich globular cluster systems; (2) there often exists a cD galaxy in the center of clusters; (3) different types of dwarf galaxies have different clustering properties; (4) in some cases the faint end of the dwarf galaxy luminosity function seems to depend on the cluster-centric distance; (5) the centroid of the X-ray gas, which constrain the (dark) matter distribution, do not always match the position of the central galaxy. The question arises, whether these properties might have some interrelation. In this poster, the properties of the globular cluster systems of the central early-type galaxies in the compact and evolved Fornax galaxy cluster are reviewed. Further, the attention is focused on the properties of the dwarf galaxy population in this cluster. The question is addressed, whether a scenario in which dwarf galaxies have been accreted and dissolved in the cluster center can explain the observed properties of the extraordinarily rich globular cluster system and the extended cD halo around the central galaxy NGC 1399. Two scenarios seems possible to explain the increase of the specific frequency of the central globular cluster system: (i) infalling gas from stripped dwarf galaxies formed globular clusters very efficiently and/or, (ii) accreted and stripped dwarf galaxies possessed a rich globular cluster system themselves and the accretion rate was very high.
Hilker Michael
Infante Leopoldo
Kissler-Patig Markus
Richtler Tom
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