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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24961
Title: Sardinia Radio Telescope wide-band spectral-polarimetric observations of the galaxy cluster 3C 129
Authors: MURGIA, MATTEO 
GOVONI, FEDERICA 
CARRETTI, ETTORE 
MELIS, Andrea 
CONCU, Raimondo 
TROIS, ALESSIO 
Loi, F.
VACCA, VALENTINA 
TARCHI, ANDREA 
CASTANGIA, PAOLA 
POSSENTI, ANDREA 
Bocchinu, A.
BURGAY, MARTA 
CASU, Silvia 
PELLIZZONI, ALBERTO PAOLO 
PISANU, Tonino 
PODDIGHE, Antonio 
POPPI, Sergio 
D'AMICO, NICOLO' 
BACHETTI, Matteo 
CORONGIU, ALESSANDRO 
EGRON, ELISE MARIE JEANNE 
Iacolina, N.
LADU, Adelaide 
MARONGIU, Pasqualino 
MIGONI, CARLO 
PERRODIN, DELPHINE 
PILIA, Maura 
Valente, G.
VARGIU, GIAN PAOLO 
Issue Date: 2016
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 461
Issue: 4
First Page: 3516
Abstract: We present new observations of the galaxy cluster 3C 129 obtained with the Sardinia Radio Telescope in the frequency range 6000-7200 MHz, with the aim to image the large-angular-scale emission at high-frequency of the radio sources located in this cluster of galaxies. The data were acquired using the recently commissioned ROACH2-based backend to produce full-Stokes image cubes of an area of 1°×1° centred on the radio source 3C 129. We modelled and deconvolved the telescope beam pattern from the data. We also measured the instrumental polarization beam patterns to correct the polarization images for off-axis instrumental polarization. Total intensity images at an angular resolution of 2.9 arcmin were obtained for the tailed radio galaxy 3C 129 and for 13 more sources in the field, including 3C 129.1 at the galaxy cluster centre. These data were used, in combination with literature data at lower frequencies, to derive the variation of the synchrotron spectrum of 3C 129 along the tail of the radio source. If the magnetic field is at the equipartition value, we showed that the lifetimes of radiating electrons result in a radiative age for 3C 129 of t<SUB>syn</SUB> ≃ 267 ± 26 Myr. Assuming a linear projected length of 488 kpc for the tail, we deduced that 3C 129 is moving supersonically with a Mach number of M = v<SUB>gal</SUB>/c<SUB>s</SUB> = 1.47. Linearly polarized emission was clearly detected for both 3C 129 and 3C 129.1. The linear polarization measured for 3C 129 reaches levels as high as 70 per cent in the faintest region of the source where the magnetic field is aligned with the direction of the tail.
URI: http://hdl.handle.net/20.500.12386/24961
URL: https://academic.oup.com/mnras/article/461/4/3516/2608623
ISSN: 0035-8711
DOI: 10.1093/mnras/stw1552
Bibcode ADS: 2016MNRAS.461.3516M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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