A normal abundance of faint satellites in the fossil group NGC 6482
A fossil group is considered the end product in a galaxy group’s evolution. It is a massive central galaxy that dominates the luminosity budget of the group, and is the outcome of efficient merging between intermediate-luminosity members. Little is known, however, about the faint satellite systems o...
Gespeichert in:
| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
18 November 2013
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| In: |
Astronomy and astrophysics
Year: 2013, Jahrgang: 559, Pages: 1-14 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201321288 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/201321288 Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2013/11/aa21288-13/aa21288-13.html Resolving-System, kostenfrei, Volltext: http://www.aanda.org/articles/aa/abs/2013/11/aa21288-13/aa21288-13.html 
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| Verfasserangaben: | S. Lieder; S. Mieske; R. Sánchez-Janssen; M. Hilker; T. Lisker; M. Tanaka |
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| 245 | 1 | 2 | |a A normal abundance of faint satellites in the fossil group NGC 6482 |c S. Lieder; S. Mieske; R. Sánchez-Janssen; M. Hilker; T. Lisker; M. Tanaka |
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| 520 | |a A fossil group is considered the end product in a galaxy group’s evolution. It is a massive central galaxy that dominates the luminosity budget of the group, and is the outcome of efficient merging between intermediate-luminosity members. Little is known, however, about the faint satellite systems of fossil groups. Here we present a Subaru/Suprime-Cam wide-field, deep imaging study in the B− and R−bands of the nearest fossil group NGC 6482 (Mtot ~ 4 × 1012 M⊙), covering the virial radius out to 310 kpc. We performed detailed completeness estimations and selected group member candidates by a combination of automated object detection and visual inspection. A fiducial sample of 48 member candidates down to MR ~ −10.5 mag is detected, making this study the deepest of a fossil group to now. We investigate the photometric scaling relations, the color-magnitude relation, and the luminosity function of our galaxy sample. We find evidence of recent and ongoing merger events among bright group galaxies. The color-magnitude relation is comparable to that of nearby galaxy clusters, and it exhibits significant scatter at the faintest luminosities. The completeness-corrected luminosity function is dominated by early-type dwarfs and is characterized by a faint end slope α = −1.32 ± 0.05. We conclude that the NGC 6482 fossil group shows photometric properties consistent with those of regular galaxy clusters and groups, including a normal abundance of faint satellites. | ||
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