The isolated fossil group RXJ1119.7+2126

Abstract

Fossil groups are galaxy structures that probably underwent a nearly complete fusion of all intermediate magnitude galaxies into a single large central dominant galaxy. However, the formation and evolution processes of these structures are still not well understood. In order to test this scenario and its implications we studied the fossil group RXJ1119.7+2126, based on available spectroscopy of the galaxies in the low density large scale region around the fossil group and deep B and R band imaging of its close vicinity and three comparison fields. We used spectroscopic data to investigate the degree of isolation of RXJ1119.7+2126 in terms of bright neighbour galaxies. The imaging data were used to derive the color magnitude relation and select faint galaxies statistically belonging to this structure. The structure appears as a very isolated group exhibiting a red sequence in the color magnitude relation with characteristics close to the red sequences already observed for other fossil groups. All these results can be interpreted consistently in the framework of the building up process generally proposed for fossil groups.

arXiv commentAccepted in A&A, based on OHP data (Carelec 193 and CCD 120), still not A&A english-improved

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• The Fossil Phase in the Life of a Galaxy Group
• The XMM-LSS survey: optical assessment and properties of different X-ray selected cluster classes
• Are fossil groups early-forming galaxy systems?
• Fossil Group Origins VII. Galaxy substructures in fossil systems
• Comparison of the properties of two fossil groups of galaxies with the normal group NGC 6034 based on multiband imaging and optical spectroscopy
• Fossil Groups in the Millennium Simulation: Their environment and its evolution
• NGC 4104: a shell galaxy in a forming fossil group
• Fossil group origins: VIII RXJ075243.6+455653 a transitionary fossil group