Spectral Index of the Filaments in the Abell 523 Radio Halo

Autor: Valentina Vacca, Federica Govoni, Richard A. Perley, Matteo Murgia, Ettore Carretti, Francesca Loi, Luigina Feretti, Gabriele Giovannini

Publikováno v: Galaxies, Vol 9, Iss 4, p 112 (2021)

The galaxy cluster Abell 523 hosts a radio halo characterized by the presence of two filaments transversely located with respect to the cluster merger axis. In this paper, we present a spectral index image of these filaments between 1.410 and 1.782 G

Externí odkaz: https://doaj.org/article/12d26ad7c85941b0927e1e5dd17e3d5e

Puzzling large-scale polarization in the galaxy cluster Abell 523

Autor: Valentina Vacca, Federica Govoni, Matteo Murgia, Richard A Perley, Luigina Feretti, Gabriele Giovannini, Ettore Carretti, Fabio Gastaldello, Filippo Cova, Paolo Marchegiani, Elia Battistelli, Walter Boschin, Torsten A Enßlin, Marisa Girardi, Francesca Loi, Federico Radiconi

Large-scale magnetic fields reveal themselves through diffuse synchrotron sources observed in galaxy clusters such as radio halos. Total intensity filaments of these sources have been observed in polarization as well, but only in three radio halos ou

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64335e1a7c493a1980eb949eecce06e9
http://arxiv.org/abs/2206.03402

Cygnus A jointly calibrated and imaged via non-convex optimisation from VLA data

Autor: Richard A. Perley, Arwa Dabbech, Audrey Repetti, Yves Wiaux, Oleg Smirnov

Radio interferometric (RI) data are noisy under-sampled spatial Fourier components of the unknown radio sky affected by direction-dependent antenna gains. Failure to model these antenna gains accurately results in a radio sky estimate with limited fi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35e017c6c2a730d8f20fe415c4cad1f2

The X-ray ribs within the cocoon shock of Cygnus A

Autor: Alastair C. Edge, Bradford Snios, Michael W. Wise, William G. Mathews, Robert Laing, Martin J. Hardcastle, Paul Nulsen, Ryan T. Duffy, M. N. de Vries, Leith Godfrey, Chris Carilli, D. Rafferty, Mark Birkinshaw, Judith H. Croston, Richard A. Perley, Brian R. McNamara, John McKean, Diana M Worrall

Publikováno v: Duffy, R T, Worrall, D M, Birkinshaw, M, Nulsen, P E J, Wise, M W, de Vries, M N, Snios, B, Mathews, W G, Perley, R A, Hardcastle, M J, Rafferty, D A, McNamara, B R, Edge, A C, McKean, J P, Carilli, C L, Croston, J H, Godfrey, L E H & Laing, R A 2018, ' The X-ray ribs within the cocoon shock of Cygnus A ', Monthly Notices of the Royal Astronomical Society, vol. 476, no. 4, pp. 4848-4860 . https://doi.org/10.1093/mnras/sty549
Monthly Notices of the Royal Astronomical Society, 476(4), 4848-4860. Oxford University Press
Monthly notices of the Royal Astronomical Society, 2018, Vol.476(4), pp.4848-4860 [Peer Reviewed Journal]

We use new and archival Chandra observations of Cygnus A, totalling $\sim$1.9 Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like structure. We confirm t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcb8a6ed24a28890a7d9750a4ee79e39
https://research.rug.nl/en/publications/d07cb9a8-c6d6-4512-a36a-b2d6420193b1

Comparison of classical and Bayesian imaging in radio interferometry

Autor: Hertzog L. Bester, Richard A. Perley, Reimar Leike, Rüdiger Westermann, Torsten A. Enßlin, Oleg Smirnov, Philipp Arras

Publikováno v: Astronomy & Astrophysics. 646:A84

CLEAN, the commonly employed imaging algorithm in radio interferometry, suffers from a number of shortcomings: In its basic version, it does not have the concept of diffuse flux, and the common practice of convolving the CLEAN components with the CLE

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8cf815316695de09aa41ecd69fd20406
https://doi.org/10.1051/0004-6361/202039258