The globular cluster system of NGC 1316: III. Kinematic complexity

The merger remnant NGC 1316 (Fornax A) is one of the most important objects regarding the investigation of and thus an important object to study merger-related processes. A recent photometric study used globular clusters in NGC 1316 to constrain its star formation history, but without the knowledge...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2014-09, Vol.569, p.1-18
Main Authors: Richtler, T, Hilker, M, Kumar, B, Bassino, L P, Gomez, M, Dirsch, B
Format: Article
Language:English
Subjects:
Astronomy
Complexity
Dark matter
Density
Globular clusters
Halos
Photometry
Radial velocity
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Summary:The merger remnant NGC 1316 (Fornax A) is one of the most important objects regarding the investigation of and thus an important object to study merger-related processes. A recent photometric study used globular clusters in NGC 1316 to constrain its star formation history, but without the knowledge of individual radial velocities. Planetary nebulae in NGC 1316 indicate a massive dark halo, and globular cluster velocities provide independent evidence. We aim at measuring radial velocities of globular clusters in NGC 1316. We use these kinematical data to investigate the global structure of NGC 1316 and to constrain the dark matter content. The central dark matter density of the present model resembles a giant elliptical galaxy. Modified Newtonian dynamics (MOND) would provide a solution, but the kinematical complexity of NGC 1316 does not allow a really firm conclusion. However, NGC 1316 might anyway be a problem for a cold dark matter scenario, if the high dark matter density in the inner region is confirmed in future studies.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201423525