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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/1852
- The globular cluster system of the young elliptical NGC 6702
- Georgakakis, Antonis; Forbes, Duncan A.; Brodie, Jean P.
- We study the globular cluster (GC) system of the dust-lane elliptical galaxy NGC 6702, using B-, V- and I-band imaging observations carried out at the Keck telescope. This galaxy has a spectroscopic age of ~2Gyr suggesting recent star formation. We find strong evidence for a bimodal GC colour distribution, with the blue peak having a colour similar to that of the Galactic halo GCs. Assuming that the blue GCs are indeed old and metal-poor, we estimate an age of 2-5Gyr and supersolar metallicity for the red GC subpopulation. Despite the large uncertainties, this is in reasonable agreement with the spectroscopic galaxy age. Additionally, we estimate a specific frequency of SN=2.3+/-1.1 for NGC 6702. We predict that passive evolution of NGC 6702 will further increase its specific frequency to SN~2.7 within 10Gyr, in closer agreement to that of typical present-day ellipticals. We also discuss evidence that the merger/accretion event that took place a few Gyr ago involved a high gas fraction.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. School of Biophysical Science and Electrical Engineering. Centre for Astrophysics and Supercomputing
- Monthly notices of the Royal Astronomical Society, Vol. 324, no. 4 (2002), pp. 785-796
- Publication year
- globular clusters: general; galaxies: individual: NGC 6702; galaxies: star clusters
- Blackwell Science Ltd.
- Publisher URL
- Copyright © 2001 The Royal Astronomical Society. Author's final draft reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed