期刊
ASTRONOMY & ASTROPHYSICS
卷 494, 期 2, 页码 429-442出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810588
关键词
galaxies: clusters: general; galaxies: clusters: individual: Abell 1240; galaxies: clusters: individual: Abell 2345; radiation mechanisms: non-thermal; polarization; magnetic fields
资金
- National Science Foundation
- Italian Space Agency (ASI) [I/088/06/0]
- Italian Ministry for University and Research (MIUR)
- Italian National Institute for Astrophysics (INAF)
- National Aeronautics and Space Administration
Aims. The aim of the present work is to study the radio properties of double relics in Abell 1240 and Abell 2345 in the framework of double relic formation models. Methods. We present new Very Large Array observations at 20 and 90 cm for these two clusters. We performed spectral index and polarization analysis and compared our results with expectations from theoretical models. Results. The presence of double relics in these two cluster is confirmed by these new observations. Double relics in Abell 1240 show radio morphology, spectral index, and polarization values in agreement with outgoing merger shocks models. One of the relics of Abell 2345 shows a peculiar morphology and spectral index profile, which are difficult to reconcile with present scenarios. We suggest a possible origin for this peculiar relic.
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