تقرير
The thermal and non-thermal components within and between galaxy clusters Abell 399 and Abell 401
| العنوان: | The thermal and non-thermal components within and between galaxy clusters Abell 399 and Abell 401 |
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| المؤلفون: | Radiconi, Federico, Vacca, Valentina, Battistelli, Elia, Bonafede, Annalisa, Capalbo, Valentina, Devlin, Mark J., Di Mascolo, Luca, Feretti, Luigina, Gallardo, Patricio A., Gill, Ajay, Giovannini, Gabriele, Govoni, Federica, Guan, Yilun, Hilton, Matt, Hincks, Adam D., Hughes, John P., Iacobelli, Marco, Isopi, Giovanni, Loi, Francesca, Moodley, Kavilan, Mroczkowski, Tony, Murgia, Matteo, Orrù, Emanuela, Paladino, Rosita, Partridge, Bruce, Sarazin, Craig L., Scherer, Jack Orlowski, Sifón, Cristóbal, Vargas, Cristian, Vazza, Franco, Wollack, Edward J. |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We measure the local correlation between radio emission and Compton-$y$ signal across two galaxy clusters, Abell~399 and Abell~401, using maps from the Low-Frequency Array (LOFAR) and the Atacama Cosmology Telescope (ACT) + \Planck. These datasets allow us to make the first measurement of this kind at $\sim$arcminute resolution. We find that the radio brightness scales as $F_{\mathrm{radio}} \propto y^{1.5}$ for Abell~401 and $F_{\mathrm{radio}} \propto y^{2.8}$ for Abell~399. Furthermore, using \XMM data, we derive a sublinear correlation between radio and X-ray brightness for both the clusters ($F_{\mathrm{radio}} \propto F_{\rm X}^{0.7}$). Finally, we correlate the Compton-$y$ and X-ray data, finding that an isothermal model is consistent with the cluster profiles, $y \propto F_{\rm X}^{0.5}$. By adopting an isothermal--$\beta$ model, we are able, for the first time, to jointly use radio, X-ray, and Compton-$y$ data to estimate the scaling index for the magnetic field profile, $B(r) \propto n_{\mathrm{e}}(r)^{\eta}$ in the injection and re-acceleration scenarios. Applying this model, we find that the combined radio and Compton-$y$ signal exhibits a significantly tighter correlation with the X-ray across the clusters than when the datasets are independently correlated. We find $\eta \sim 0.6{-}0.8$. These results are consistent with the upper limit we derive for the scaling index of the magnetic field using rotation measure values for two radio galaxies in Abell~401. We also measure the radio, Compton-$y$, and X-ray correlations in the filament between the clusters but conclude that deeper data are required for a convincing determination of the correlations in the filament. Comment: 16 pages, 8 figures, Accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journal |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stac3015 |
| URL الوصول: | http://arxiv.org/abs/2206.04697 |
| رقم الأكسشن: | edsarx.2206.04697 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stac3015 |
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