1. Главная
  2. Ресурсы
  3. Библиотечный поиск
The Beautiful Mess inAbell 2255 A. BotteonG. BrunettiR. J. van Weeren2020 год

The Beautiful Mess in Abell 2255
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: Abstract We present LOFAR observations of one of the most spectacular objects in the radio sky: Abell 2255. This is a nearby ( z = 0.0806) merging galaxy cluster hosting one of the first radio halos ever detected in the intracluster medium (ICM). The deep LOFAR images at 144 MHz of the central ∼10 Mpc 2 region show a plethora of emission on different scales, from tens of kiloparsecs to above megaparsec sizes. In this work, we focus on the innermost region of the cluster. Among the numerous interesting features observed, we discover remarkable bright and filamentary structures embedded in the radio halo. We incorporate archival WSRT 1.2 GHz data to study the spectral properties of the diffuse synchrotron emission and find a very complex spectral index distribution in the halo spanning a wide range of values. We combine the radio data with Chandra observations to investigate the connection between the thermal and nonthermal components by quantitatively comparing the radio and X-ray surface brightness and the spectral index of the radio emission with the thermodynamical quantities of the ICM. Despite the multitude of structures observed in the radio halo, we find that the X-ray and radio emission are overall well correlated. The fact that the steepest spectrum emission is located in the cluster center and traces regions with high entropy possibly suggests the presence of seed particles injected by radio galaxies that are spread in the ICM by the turbulence generating the extended radio halo.
Год издания: 2020
Авторы: A. Botteon, G. Brunetti, R. J. van Weeren, T. W. Shimwell, R. Pizzo, R. Cassano, M. Iacobelli, F. Gastaldello, L. Bırzan, A. Bonafede, M. Brüggen, V. Cuciti, D. Dallacasa, F. de Gasperin, G. Di Gennaro, A. Drabent, M. J. Hardcastle, M. Hoeft, S. Mandal, H. J. A. Röttgering, A. Simionescu
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Radio Astronomy Observations and Technology, Galaxies: Formation, Evolution, Phenomena, Astrophysics and Cosmic Phenomena
Другие ссылки: The Astrophysical Journal (PDF)
The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
Data Archiving and Networked Services (DANS) (PDF)
Data Archiving and Networked Services (DANS) (HTML)
Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (PDF)
Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (HTML)
Data Archiving and Networked Services (DANS) (PDF)
Data Archiving and Networked Services (DANS) (HTML)
DataCite API (HTML)