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2012MNRAS.424.2130L - Mon. Not. R. Astron. Soc., 424, 2130-2138 (2012/August-2)
Nuclear star clusters and the stellar spheroids of their host galaxies.
LEIGH N., BOKER T. and KNIGGE C.
Abstract (from CDS):
This confirms recent results that the shape of the
In order to assess which physical parameters drive the observed nuclear cluster masses, we also carry out a joint multivariate power-law fit to the data. In this, we allow the nuclear cluster mass to depend on spheroid mass and radius (and hence implicitly on velocity dispersion), as well as on the size of the globular cluster reservoir. When considered together, the dependences on MSph and RSph are roughly consistent with the virial theorem, and therefore MNSC∝σ2. However, the only statistically significant correlation appears to be a simple linear scaling between NSC mass and luminous spheroid mass.
We proceed to directly compare the derived NSC masses with predictions for two popular models for NSC formation, namely (i) globular cluster infall due to dynamical friction and (ii) in situ formation during the early phases of galaxy formation that is regulated via momentum feedback from stellar winds and/or supernovae. Neither model can directly predict the observations, and we discuss possible interpretations of our findings.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS
Journal keyword(s): methods: statistical - galaxies: elliptical and lenticular, cD - galaxies: nuclei - galaxies: photometry
Simbad objects: 54
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