Globular cluster systems in fossil groups: NGC 6482, NGC 1132, and ESO 306-017

Alamo-Martinez, K. A., West, M. J., Blakeslee, J. P., Gonzalez-Lopezlira, R. A., Jordan, A., Gregg, M., Cote, P., Drinkwater, M. J. and van den Bergh, S. (2012) Globular cluster systems in fossil groups: NGC 6482, NGC 1132, and ESO 306-017. Astronomy and Astrophysics, 546 A15.1-A15.14. doi:10.1051/0004-6361/201219285

Author Alamo-Martinez, K. A.
West, M. J.
Blakeslee, J. P.
Gonzalez-Lopezlira, R. A.
Jordan, A.
Gregg, M.
Cote, P.
Drinkwater, M. J.
van den Bergh, S.
Title Globular cluster systems in fossil groups: NGC 6482, NGC 1132, and ESO 306-017
Journal name Astronomy and Astrophysics   Check publisher's open access policy
ISSN 0004-6361
Publication date 2012-10-01
Sub-type Article (original research)
DOI 10.1051/0004-6361/201219285
Open Access Status DOI
Volume 546
Start page A15.1
End page A15.14
Total pages 14
Place of publication Les Ulis, France
Publisher E D P Sciences
Language eng
Abstract We study the globular cluster (GC) systems in three representative fossil group galaxies: the nearest (NGC 6482), the prototype (NGC 1132) and the most massive known to date (ESO 306-017). This is the first systematic study of GC systems in fossil groups. Using data obtained with the Hubble Space Telescope Advanced Camera for Surveys in the F475W and F850LP filters, we determine the GC color and magnitude distributions, surface number density profiles, and specific frequencies. In all three systems, the GC color distribution is bimodal, the GCs are spatially more extended than the starlight, and the red population is more concentrated than the blue. The specific frequencies seem to scale with the optical luminosities of the central galaxy and span a range similar to that of the normal bright elliptical galaxies in rich environments. We also analyze the galaxy surface brightness distributions to look for deviations from the best-fit Sérsic profiles; we find evidence of recent dynamical interaction in all three fossil group galaxies. Using X-ray data from the literature, we find that luminosity and metallicity appear to correlate with the number of GCs and their mean color, respectively. Interestingly, although NGC 6482 has the lowest mass and luminosity in our sample, its GC system has the reddest mean color, and the surrounding X-ray gas has the highest metallicity.
Keyword Galaxies: elliptical and lenticular, cD
Galaxies: star clusters: general
Galaxies: groups: general
Galaxies: individual: NGC 6482
Galaxies: individual: NGC 1132
Galaxies: individual: ESO 306-017
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Section: Extragalactic astronomy

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
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