Multi-wavelength observations of the dissociative merger in the galaxy cluster ciza J0107.7+5408
MetadataShow full item record
This is an author-created, un-copy edited version of an article accepted for publication in Astrophysical Journal. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/0004-637X/823/2/94.
We present results based on X-ray, optical, and radio observations of the massive galaxy cluster CIZA J0107.7+5408. We find that this system is a post-core-passage, dissociative, binary merger, with the optical galaxy density peaks of each subcluster leading their associated X-ray emission peaks. This separation occurs because the diffuse gas experiences ram pressure forces, while the effectively collisionless galaxies (and presumably their associated dark matter (DM) halos) do not. This system contains double-peaked diffuse radio emission, possibly a double radio relic with the relics lying along the merger axis and also leading the X-ray cores. We find evidence for a temperature peak associated with the SW relic, likely created by the same merger shock that is powering the relic radio emission in this region. Thus, this system is a relatively rare, clean example of a dissociative binary merger, which can in principle be used to place constraints on the self-interaction cross-section of DM. Low-frequency radio observations reveal ultra-steep spectrum diffuse radio emission that is not correlated with the X-ray, optical, or high-frequency radio emission. We suggest that these sources are radio phoenixes, which are preexisting non-thermal particle populations that have been re-energized through adiabatic compression by the same merger shocks that power the radio relics. Finally, we place upper limits on inverse Compton emission from the SW radio relic.
Showing items related by title, author, creator and subject.
De Gasperin, F.; Intema, Hubertus; Ridl, J.; Salvato, M.; Van Weeren, R.; Bonafede, A.; Greiner, J.; Cassano, R.; Brüggen, M. (2017)Context. Galaxy clusters undergo mergers that can generate extended radio sources called radio relics. Radio relics are the consequence of merger-induced shocks that propagate in the intra cluster medium (ICM). Aims. In ...
Deep Very Large Array Observations of the Merging Cluster CIZA J2242.8+5301: Continuum and Spectral ImagingGennaro, G.; Van Weeren, R.; Hoeft, M.; Kang, H.; Ryu, D.; Rudnick, L.; Forman, W.; Röttgering, H.; Brüggen, M.; Dawson, W.; Golovich, N.; Hoang, D.; Intema, Hubertus; Jones, C.; Kraft, R.; Shimwell, T.; Stroe, A. (2018)Despite the progress that has been made in understanding radio relics, there are still open questions regarding the underlying particle acceleration mechanisms. In this paper, we present deep 1-4 GHz Very Large Array (VLA) ...
Van Weeren, R.; Brunetti, G.; Brüggen, M.; Andrade-Santos, F.; Ogrean, G.; Williams, W.; Röttgering, H.; Dawson, W.; Forman, W.; Gasperin, F.; Hardcastle, M.; Jones, C.; Miley, G.; Rafferty, D.; Rudnick, L.; Sabater, J.; Sarazin, C.; Shimwell, T.; Bonafede, A.; Best, P.; Birzan, L.; Cassano, R.; Chyzy, K.; Croston, J.; Dijkema, T.; Enßlin, T.; Ferrari, C.; Heald, G.; Hoeft, M.; Horellou, C.; Jarvis, M.; Kraft, R.; Mevius, M.; Intema, Hubertus; Murray, S.; Orrú, E.; Pizzo, R.; Sridhar, S.; Simionescu, A.; Stroe, A.; Tol, S.; White, G. (2016)We present deep LOFAR observations between 120 and 181 MHz of the "Toothbrush" (RX J0603.3+4214), a cluster that contains one of the brightest radio relic sources known. Our LOFAR observations exploit a new and novel ...