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dc.contributor.authorMandal, S.
dc.contributor.authorIntema, Huib
dc.contributor.authorShimwell, T.W.
dc.contributor.authorVan Weeren, R.J.
dc.contributor.authorBotteon, A.
dc.contributor.authorRöttgering, H.J.A.
dc.contributor.authorHoang, D.N.
dc.contributor.authorBrunetti, G.
dc.contributor.authorDe Gasperin, F.
dc.contributor.authorGiacintucci, S.
dc.contributor.authorHoekstra, H.
dc.contributor.authorStroe, A.
dc.contributor.authorBrüggen, M.
dc.contributor.authorCassano, R.
dc.contributor.authorShulevski, A.
dc.contributor.authorDrabent, A.
dc.contributor.authorRafferty, D.
dc.date.accessioned2019-07-22T01:45:57Z
dc.date.available2019-07-22T01:45:57Z
dc.date.issued2019
dc.identifier.citationMandal, S. and Intema, H.T. and Shimwell, T.W. and Van Weeren, R.J. and Botteon, A. and Röttgering, H.J.A. and Hoang, D.N. et al. 2019. Ultra-steep spectrum emission in the merging galaxy cluster Abell 1914. Astronomy and Astrophysics. 622: ARTN A22.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/76020
dc.identifier.doi10.1051/0004-6361/201833992
dc.description.abstract

A number of radio observations have revealed the presence of large synchrotron-emitting sources associated with the intra-cluster medium. There is strong observational evidence that the emitting particles have been (re-)accelerated by shocks and turbulence generated during merger events. The particles that are accelerated are thought to have higher initial energies than those in the thermal pool but the origin of such mildly relativistic particles remains uncertain and needs to be further investigated. The galaxy cluster Abell 1914 is a massive galaxy cluster in which X-ray observations show clear evidence of merging activity. We carried out radio observations of this cluster with the LOw Frequency ARay (LOFAR) at 150 MHz and the Giant Metrewave Radio Telescope (GMRT) at 610 MHz. We also analysed Very Large Array (VLA) 1.4 GHz data, archival GMRT 325 MHz data, CFHT weak lensing data and Chandra observations. Our analysis shows that the ultra-steep spectrum source (4C38.39; α -2), previously thought to be part of a radio halo, is a distinct source with properties that are consistent with revived fossil plasma sources. Finally, we detect some diffuse emission to the west of the source 4C38.39 that could belong to a radio halo.

dc.languageEnglish
dc.publisherEDP SCIENCES S A
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectAstronomy & Astrophysics
dc.subjectgalaxies: clusters: intracluster medium
dc.subjectgalaxies: clusters: individual: Abell 1914
dc.subjectradio continuum: general
dc.subjectradiation mechanisms: non-thermal
dc.subjectshock waves
dc.subjectGIANT RADIO HALOES
dc.subjectPARTICLE-ACCELERATION
dc.subjectLOFAR DISCOVERY
dc.subjectRAY
dc.subjectSHOCK
dc.subjectCOMA
dc.subjectORIGIN
dc.subjectMERGER
dc.subjectTEMPERATURE
dc.subjectTURBULENCE
dc.titleUltra-steep spectrum emission in the merging galaxy cluster Abell 1914
dc.typeJournal Article
dcterms.source.volume622
dcterms.source.issn0004-6361
dcterms.source.titleAstronomy and Astrophysics
dc.date.updated2019-07-22T01:45:57Z
curtin.note

Reproduced with permission from Astronomy & Astrophysics, © ESO

curtin.departmentSchool of Elec Eng, Comp and Math Sci (EECMS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidIntema, Huib [0000-0002-5880-2730]
curtin.contributor.researcheridIntema, Huib [D-1438-2012]
curtin.identifier.article-numberARTN A22
dcterms.source.eissn1432-0746
curtin.contributor.scopusauthoridIntema, Huib [55958431900] [8549469700]


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