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LOFAR, VLA, and Chandra observations of the Toothbrush galaxy cluster

LOFAR, VLA, and Chandra observations of the Toothbrush ...

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dc.contributor.author van Weeren, R. J. pl
dc.contributor.author Brunetti, G. pl
dc.contributor.author Brüggen, M. pl
dc.contributor.author Andrade-Santos, F. pl
dc.contributor.author Ogrean, G. A. pl
dc.contributor.author Williams, W. L. pl
dc.contributor.author Röttgering, H. J. A. pl
dc.contributor.author Dawson, W. A. pl
dc.contributor.author Forman, W. R. pl
dc.contributor.author de Gasperin, F. pl
dc.contributor.author Hardcastle, M. J. pl
dc.contributor.author Jones, C. pl
dc.contributor.author Miley, G. K. pl
dc.contributor.author Rafferty, D. A. pl
dc.contributor.author Rudnick, L. pl
dc.contributor.author Sabater, J. pl
dc.contributor.author Sarazin, C. L. pl
dc.contributor.author Shimwell, T. W. pl
dc.contributor.author Bonafede, A. pl
dc.contributor.author Best, P. N. pl
dc.contributor.author Bîrzan, L. pl
dc.contributor.author Cassano, R. pl
dc.contributor.author Chyży, Krzysztof [SAP11011785] pl
dc.contributor.author Croston, J. H. pl
dc.contributor.author Dijkema, T. J. pl
dc.contributor.author Enßlin, T. pl
dc.contributor.author Ferrari, C. pl
dc.contributor.author Heald, G. pl
dc.contributor.author Hoeft, M. pl
dc.contributor.author Horellou, C. pl
dc.contributor.author Jarvis, M. J. pl
dc.contributor.author Kraft, R. P. pl
dc.contributor.author Mevius, M. pl
dc.contributor.author Intema, H. T. pl
dc.contributor.author Murray, S. S. pl
dc.contributor.author Orrú, E. pl
dc.contributor.author Pizzo, R. pl
dc.contributor.author Sridhar, S. S. pl
dc.contributor.author Simionescu, A. pl
dc.contributor.author Stroe, A. pl
dc.contributor.author van der Tol, S. pl
dc.contributor.author White, G. J. pl
dc.date.accessioned 2016-06-29T11:58:52Z
dc.date.available 2016-06-29T11:58:52Z
dc.date.issued 2016 pl
dc.identifier.issn 0004-637X pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/28467
dc.language eng pl
dc.rights Dodaję tylko opis bibliograficzny *
dc.rights.uri *
dc.title LOFAR, VLA, and Chandra observations of the Toothbrush galaxy cluster pl
dc.type JournalArticle pl
dc.abstract.en 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 calibration scheme to probe 10 times deeper than any previous study in this relatively unexplored part of the spectrum. The LOFAR observations, when combined with VLA, GMRT, and Chandra X-ray data, provide new information about the nature of cluster merger shocks and their role in re-accelerating relativistic particles. We derive a spectral index of \alpha = -0.8 \pm 0.1 at the northern edge of the main radio relic, steepening toward the south to \alpha \approx -2. The spectral index of the radio halo is remarkably uniform (\alpha = -1.16, with an intrinsic scatter of \leqslant 0.04). The observed radio relic spectral index gives a Mach number of M = 2.8\frac{+0,5}{-0,3}, assuming diffusive shock acceleration. However, the gas density jump at the northern edge of the large radio relic implies a much weaker shock (M \approx 1.2, with an upper limit of M \approx 1.5). The discrepancy between the Mach numbers calculated from the radio and X-rays can be explained if either (i) the relic traces a complex shock surface along the line of sight, or (ii) if the radio relic emission is produced by a re-accelerated population of fossil particles from a radio galaxy. Our results highlight the need for additional theoretical work and numerical simulations of particle acceleration and reacceleration at cluster merger shocks pl
dc.subject.en galaxies: clusters: individual: RX J0603.3+4214 pl
dc.subject.en galaxies: clusters: intracluster medium pl
dc.subject.en large-scale structure of Universe pl
dc.subject.en radiation mechanisms: non-thermal pl
dc.subject.en X-rays: galaxies: clusters pl
dc.description.volume 818 pl
dc.description.number 2 pl
dc.identifier.doi 10.3847/0004-637X/818/2/204 pl
dc.identifier.eissn 1538-4357 pl
dc.title.journal The Astrophysical Journal pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne pl
dc.subtype Article pl
dc.identifier.articleid 204 pl
dc.rights.original CC-BY; inne; ostateczna wersja wydawcy; po opublikowaniu; 12; pl
.pointsMNiSW [2016 A]: 40


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