Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Shimwell, T."'
Autor:
de Jong, J. M. G. H. J., van Weeren, R. J., Sweijen, F., Oonk, J. B. R., Shimwell, T. W., Offringa, A. R., Morabito, L. K., Röttgering, H. J. A., Kondapally, R., Escott, E. L., Best, P. N., Bondi, M., Ye, H., Petley, J. W.
We present the deepest wide-field 115-166 MHz image at sub-arcsecond resolution spanning an area of 2.5 by 2.5 degrees centred at the ELAIS-N1 deep field. To achieve this, we improved the calibration for the International LOFAR Telescope. This enhanc
Externí odkaz:
http://arxiv.org/abs/2407.13247
Autor:
Piras, S., Horellou, C., Conway, J. E., Thomasson, M., del Palacio, S., Shimwell, T. W., O'Sullivan, S. P., Carretti, E., Šnidaric, I., Jelic, V., Adebahr, B., Berger, A., Best, P. N., Brüggen, M., Ruiz, N. Herrera, Paladino, R., Prandoni, I., Sabater, J., Vacca, V.
The aim of this study is to probe the sub-mJy polarized source population with LOFAR. We present the method used to stack LOFAR polarization datasets, the resulting catalog of polarized sources, and the derived polarized source counts. The ELAIS-N1 f
Externí odkaz:
http://arxiv.org/abs/2406.08346
Autor:
Osinga, E., van Weeren, R. J., Brunetti, G., Adam, R., Rajpurohit, K., Botteon, A., Callingham, J. R., Cuciti, V., de Gasperin, F., Miley, G. K., Röttgering, H. J. A., Shimwell, T. W.
Merging galaxy clusters often host spectacular diffuse radio synchrotron sources. These sources can be explained by a non-thermal pool of relativistic electrons accelerated by shocks and turbulence in the intracluster medium. The origin of the pool a
Externí odkaz:
http://arxiv.org/abs/2405.09384
Autor:
Groeneveld, C., van Weeren, R. J., Osinga, E., Williams, W. L., Callingham, J. R., de Gasperin, F., Botteon, A., Shimwell, T., de Jong, J. M. G. H. J., Jansen, L. F., Miley, G. K., Brunetti, G., Brüggen, M., Röttgering, H. J. A.
Publikováno v:
Nature Astronomy 8 (2024) 786-795
The largely unexplored decameter radio band (10-30 MHz) provides a unique window for studying a range of astronomical topics, such as auroral emission from exoplanets, inefficient cosmic ray acceleration mechanisms, fossil radio plasma, and free-free
Externí odkaz:
http://arxiv.org/abs/2405.05311
Autor:
Pignataro, G. V., Bonafede, A., Bernardi, G., de Gasperin, F., Brunetti, G., Pasini, T., Vazza, F., Biava, N., de Jong, J. M. G. H. J., Cassano, R., Botteon, A., Brüggen, M., Röttgering, H. J. A., van Weeren, R. J., Shimwell, T. W.
Publikováno v:
A&A 685, L10 (2024)
Recent low-frequency radio observations at 140 MHz discovered a 3 Mpc-long bridge of diffuse emission connecting the galaxy clusters Abell 0399 and Abell 0401. We present follow-up observations at 60 MHz to constrain the spectral index of the bridge,
Externí odkaz:
http://arxiv.org/abs/2405.00772
Autor:
Biava, N., Bonafede, A., Gastaldello, F., Botteon, A., Brienza, M., Shimwell, T. W., Brunetti, G., Bruno, L., Rajpurohit, K., Riseley, C. J., van Weeren, R. J., Rossetti, M., Cassano, R., De Gasperin, F., Drabent, A., Rottgering, H. J. A., Edge, A. C., Tasse, C.
Radio observations of a few cool-core galaxy clusters have revealed the presence of diffuse emission on cluster scales, similar to what was found in merging clusters in the form of radio halos. These sources might suggest that a minor merger, while n
Externí odkaz:
http://arxiv.org/abs/2403.09802
Autor:
Lusetti, G., de Gasperin, F., Cuciti, V., Brüggen, M., Spinelli, C., Edler, H., Brunetti, G., van Weeren, R. J., Botteon, A., Di Gennaro, G., Cassano, R., Tasse, C., Shimwell, T. W.
Low-frequency radio observations show an increasing number of radio galaxies located in galaxy clusters that display peculiar morphologies and spectral profiles. This is the result of the dynamical interaction of the galaxy with the surrounding mediu
Externí odkaz:
http://arxiv.org/abs/2401.04710
Autor:
Botteon, A., Gastaldello, F., ZuHone, J. A., Balboni, M., Bartalucci, I., Brunetti, G., Bonafede, A., Brüggen, M., Shimwell, T. W., van Weeren, R. J.
We report on the detection of diffuse radio emission with peculiar morphology in the central region of the galaxy cluster Abell 2657. The most striking feature identified in our 144 MHz LOFAR image is a bifurcated radio arc that extends for a project
Externí odkaz:
http://arxiv.org/abs/2310.16874
Autor:
Nakoneczny, S. J., Alonso, D., Bilicki, M., Schwarz, D. J., Hale, C. L., Pollo, A., Heneka, C., Tiwari, P., Zheng, J., Brüggen, M., Jarvis, M. J., Shimwell, T. W.
Publikováno v:
A&A, 681, A105 (2024)
We combine the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) second data release (DR2) catalogue with gravitational lensing maps from the Cosmic Microwave Background (CMB) to place constraints on the bias evolution of LoTSS radio galaxies,
Externí odkaz:
http://arxiv.org/abs/2310.07642
Autor:
Hale, C. L., Schwarz, D. J., Best, P. N., Nakoneczny, S. J., Alonso, D., Bacon, D., Böhme, L., Bhardwaj, N., Bilicki, M., Camera, S., Heneka, C. S., Pashapour-Ahmadabadi, M., Tiwari, P., Zheng, J., Duncan, K. J., Jarvis, M. J., Kondapally, R., Magliocchetti, M., Rottgering, H. J. A., Shimwell, T. W.
Covering $\sim$5600 deg$^2$ to rms sensitivities of $\sim$70$-$100 $\mu$Jy beam$^{-1}$, the LOFAR Two-metre Sky Survey Data Release 2 (LoTSS-DR2) provides the largest low-frequency ($\sim$150 MHz) radio catalogue to date, making it an excellent tool
Externí odkaz:
http://arxiv.org/abs/2310.07627