PoS(EXTRA-RADSUR2015)048 Extended Diffuse Radio Emission in Abell 115 Cosmos Dumba * Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany E-mail: dumba@tls-tautenburg.de Matthias Hoeft Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany E-mail: hoeft@tls-tautenburg.de Alexander Drabent Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany E-mail: alex@tls-tautenburg.de Annalisa Bonafede Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany E-mail: annalisa.bonafede@hs.uni-hamburg.de Merging galaxy clusters have been found to host large-scale diffuse emission known as relics at their periphery. The relics are proposed to arise from merger shocks in the intracluster medium. X-ray observations in some galaxy clusters hosting radio relics have revealed density jumps as- sociated with shocks. The jumps have been shown to trace the diffuse radio emission morphology. Several recent findings indicate that the origin of radio relics is not as previously thought. For in- stance, the X-ray Mach number of many shock fronts associated with relics is low, and that relics are possibly related to AGN activity which provides a relativistic electron population that gets re-accelerated at the shock front. Abell 115 is a massive merging galaxy cluster hosting a large-scale diffuse radio emission struc- ture classified as a relic. Abell 115 was studied at 1.4 GHz and in the X-ray showing that the morphology is atypical of a relic; being significantly extended to the east. A study on the dynamic state of Abell 115 was conducted using 88 spectroscopically confirmed members suggesting that the nature of its sub-cluster components indicated a pre-merger state. For such a scenario, a shock front at the location of the relic would not be plausible. This may question if the diffuse emission in Abell 115 traces a shock front as proposed for radio relics. We study this galaxy cluster by using archival data from the VLA (1.4 GHz) and data from the GMRT (610 MHz) and WSRT (350 MHz). Images and flux measurements from the new observa- tions are provided. Flux measurements of an additional extended source to the east of the cluster center are also provided. EXTRA-RADSUR2015 (*) 20–23 October 2015 Bologna, Italy (*) This conference has been organized with the support of the Ministry of Foreign Affairs and International Cooperation, Directorate General for the Country Promotion (Bilateral Grant Agreement ZA14GR02 - Mapping the Universe on the Pathway to SKA) * Speaker. c  Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). http://pos.sissa.it/