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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421774.0, MPI für Astronomie / Publikationen_mpia
Caught in formation: The nuclear-cluster-to-Be in NGC 2139
Authors:Andersen, David R.; Walcher, C. Jakob; Böker, Torsten; Ho, Luis C.; van der Marel, Roeland P.; Rix, Hans-Walter; Shields, Joseph C.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Start Page:990
End Page:999
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Close to its center, the bulgeless galaxy NGC 2139 hosts a star cluster that is younger and less massive than any nuclear star cluster (NC) studied so far. We have measured the Halpha velocity field around the photometric center of this galaxy using the VLT ARGUS integral field unit and the GIRAFFE spectrograph in order to constrain different proposed theories of NC formation. We observe that the best-fit kinematic center and the candidate NC appear to be separated by 2.8" (320 pc). Indeed, the kinematic center is also offset from the galaxy's photometric center and a possible bar or extended region of star formation in which the young cluster resides, implying that this galaxy is not in dynamic equilibrium. The Halpha flux map also reveals other regions of strong star formation in the possible bar. These observations suggest that a nascent NC is forming away from the kinematic center of NGC 2139, which may come to rest there on a timescale of a few 100 Myr. Based on observations collected at the European Southern Observatory, Chile, proposal 74.B-0264.
Free Keywords:galaxies: individual (NGC 2139); Galaxies: Nuclei; Galaxies: Star Clusters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008ApJ...688..990A [ID No:1]
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