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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 226062.0, MPI für Astronomie / Publikationen_mpia
Mass segregation in young Magellanic Cloud
star clusters: Four clusters observed with HST
Authors:Gouliermis, D.; Keller, S. C.; Kontizas, M.; Kontizas, E.; Bellas-Velidis, I.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Astronomy and Astrophysics
Volume:416
Start Page:137
End Page:155
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present the results of our investigation on
the phenomenon of mass segregation in young star
clusters in the Magellanic Clouds. HST/WFPC2
observations on NGC 1818, NGC 2004 and NGC 2100
in the Large Magellanic Cloud and NGC 330 in the
Small Magellanic Cloud have been used for the
application of diagnostic tools for mass
segregation: i) the radial density profiles of
the clusters for various mass groups and ii)
their mass functions (MFs) at various radii
around their centres. All four clusters are
found to be mass segregated, but each one in a
different manner. Specifically not all the
clusters in the sample show the same dependence
of their density profiles on the selected
magnitude range, with NGC 1818 giving evidence
of a strong relation and NGC 330 showing only a
hint of the phenomenon. NGC 2004 did not show any
significant signature of mass segregation in its
density profiles either. The MFs radial
dependence provides clear proof of the phenomenon
for NGC 1818, NGC 2100 and NGC 2004, while for
NGC 330 it gives only indications. An
investigation of the constraints introduced by
the application of both diagnostic tools is
presented. We also discuss the problems related
to the construction of a reliable MF for a
cluster and their impact on the investigation of
the phenomenon of mass segregation. We find that
the MFs of these clusters as they were
constructed with two methods are comparable to
Salpeter's IMF. A discussion is given on the
dynamical status of the clusters and a test is
applied on the equipartition among several mass
groups in them. Both showed that the observed
mass segregation in the clusters is of
primordial nature.
Free Keywords:galaxies: star clusters; Magellanic Clouds;
; stars: luminosity function; mass function
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:HÛgel 71, 53121 Bonn, Germany;
Max-Planck-Institut fÛr Astronomie, Königstuhl
17, 69117 Heidelberg, Germany), AB(Research
School of Astronomy and Astrophysics, Mount
Stromlo Observatory, Weston, A.C.T. 2611,
Australia), AC(Department of Astrophysics
Astronomy & Mechanics, Faculty of Physics,
University of Athens, 15783 Athens, Greece),
AD(Institute for Astronomy and Astrophysics,
National Observatory of Athens, PO Box 20048,
11810 Athens, Greece), AE(Institute for Astronomy
and Astrophysics, National Observatory of Athens,
PO Box 20048, 11810 Athens, Greece)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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