Zobrazeno 1 - 10
of 353
pro vyhledávání: '"Tol, S."'
Autor:
Sweijen, F., van Weeren, R. J., Röttgering, H. J. A., Morabito, L. K., Jackson, N., Offringa, A. R., van der Tol, S., Veenboer, B., Oonk, J. B. R., Best, P. N., Bondi, M., Shimwell, T. W., Tasse, C., Thomson, A. P.
High quality low-frequency radio surveys have the promise of advancing our understanding of many important topics in astrophysics, including the life cycle of active galactic nuclei (AGN), particle acceleration processes in jets, the history of star
Externí odkaz:
http://arxiv.org/abs/2202.01608
Autor:
Offringa, A. R., Mertens, F., van der Tol, S., Veenboer, B., Gehlot, B. K., Koopmans, L. V. E., Mevius, M.
Publikováno v:
A&A 631, A12 (2019)
We analyse the accuracy of radio interferometric gridding of visibilities with the aim to quantify the Epoch of Reionization (EoR) 21-cm power spectrum bias caused by gridding, ultimately to determine the suitability of different imaging algorithms a
Externí odkaz:
http://arxiv.org/abs/1908.11232
Akademický článek
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Autor:
Mevius, M., van der Tol, S., Pandey, V. N., Vedantham, H. K., Brentjens, M. A., de Bruyn, A. G., Abdalla, F. B., Asad, K. M. B., Bregman, J. D., Brouw, W. N., Bus, S., Chapman, E., Ciardi, B., Fernandez, E. R., Ghosh, A., Harker, G., Iliev, I. T., Jelić, V., Kazemi, S., Koopmans, L. V. E., Noordam, J. E., Offringa, A. R., Patil, A. H., van Weeren, R. J., Wijnholds, S., Yatawatta, S., Zaroubi, S.
Publikováno v:
Radio Sci. 51 (2016) 927-941
LOFAR is the LOw Frequency Radio interferometer ARray located at mid-latitude ($52^{\circ} 53'N$). Here, we present results on ionospheric structures derived from 29 LOFAR nighttime observations during the winters of 2012/2013 and 2013/2014. We show
Externí odkaz:
http://arxiv.org/abs/1606.04683
Autor:
van Weeren, R. J., Williams, W. L., Hardcastle, M. J., Shimwell, T. W., Rafferty, D. A., Sabater, J., Heald, G., Sridhar, S. S., Dijkema, T. J., Brunetti, G., Brüggen, M., Andrade-Santos, F., Ogrean, G. A., Röttgering, H. J. A., Dawson, W. A., Forman, W. R., de Gasperin, F., Jones, C., Miley, G. K., Rudnick, L., Sarazin, C. L., Bonafede, A., Best, P. N., Bîrzan, L., Cassano, R., Chyży, K. T., Croston, J. H., Ensslin, T., Ferrari, C., Hoeft, M., Horellou, C., Jarvis, M. J., Kraft, R. P., Mevius, M., Intema, H. T., Murray, S. S., Orrú, E., Pizzo, R., Simionescu, A., Stroe, A., van der Tol, S., White, G. J.
LOFAR, the Low-Frequency Array, is a powerful new radio telescope operating between 10 and 240 MHz. LOFAR allows detailed sensitive high-resolution studies of the low-frequency radio sky. At the same time LOFAR also provides excellent short baseline
Externí odkaz:
http://arxiv.org/abs/1601.05422
Autor:
van Weeren, R. J., Brunetti, G., Brüggen, M., Andrade-Santos, F., Ogrean, G. A., Williams, W. L., Röttgering, H. J. A., Dawson, W. A., Forman, W. R., de Gasperin, F., Hardcastle, M. J., Jones, C., Miley, G. K., Rafferty, D. A., Rudnick, L., Sabater, J., Sarazin, C. L., Shimwell, T. W., Bonafede, A., Best, P. N., Bîrzan, L., Cassano, R., Chyży, K. T., Croston, J. H., Dijkema, T. J., Ensslin, T., Ferrari, C., Heald, G., Hoeft, M., Horellou, C., Jarvis, M. J., Kraft, R. P., Mevius, M., Intema, H. T., Murray, S. S., Orrú, E., Pizzo, R., Sridhar, S. S., Simionescu, A., Stroe, A., van der Tol, S., White, G. J.
We present deep LOFAR observations between 120-181 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
Externí odkaz:
http://arxiv.org/abs/1601.06029
Autor:
Asad, K. M. B., Koopmans, L. V. E., Jelić, V., Pandey, V. N., Ghosh, A., Abdalla, F. B., Bernardi, G., Brentjens, M. A., de Bruyn, A. G., Bus, S., Ciardi, B., Chapman, E., Daiboo, S., Fernandez, E. R., Harker, G., Iliev, I. T., Jensen, H., Martinez-Rubi, O., Mellema, G., Mevius, M., Offringa, A. R., Patil, A. H., Schaye, J., Thomas, R. M., van der Tol, S., Vedantham, H. K., Yatawatta, S., Zaroubi, S.
Detection of the 21-cm signal coming from the epoch of reionization (EoR) is challenging especially because, even after removing the foregrounds, the residual Stokes $I$ maps contain leakage from polarized emission that can mimic the signal. Here, we
Externí odkaz:
http://arxiv.org/abs/1503.01644
Autor:
van Weeren, R. J., Williams, W. L., Tasse, C., Rottgering, H. J. A., Rafferty, D. A., van der Tol, S., Heald, G., White, G. J., Shulevski, A., Best, P., Intema, H. T., Bhatnagar, S., Reich, W., Steinmetz, M., van Velzen, S., Ensslin, T. A., Prandoni, I., de Gasperin, F., Jamrozy, M., Brunetti, G., Jarvis, M. J., McKean, J. P., Wise, M. W., Ferrari, C., Harwood, J., Oonk, J. B. R., Hoeft, M., Kunert-Bajraszewska, M., Horellou, C., Wucknitz, O., Bonafede, A., Mohan, N. R., Scaife, A. M. M., Klockner, H. -R., van Bemmel, I. M., Merloni, A., Chyzy, K. T., Engels, D., Falcke, H., Pandey-Pommier, M., Alexov, A., Anderson, J., Avruch, I. M., Beck, R., Bell, M. E., Bentum, M. J., Bernardi, G., Breitling, F., Broderick, J., Brouw, W. N., Bruggen, M., Butcher, H. R., Ciardi, B., de Geus, E., de Vos, M., Deller, A., Duscha, S., Eisloffel, J., Fallows, R. A., Frieswijk, W., Garrett, M. A., Griessmeier, J., Gunst, A. W., Hamaker, J. P., Hassall, T. E., Horandel, J., van der Horst, A., Iacobelli, M., Jackson, N. J., Juette, E., Kondratiev, V. I., Kuniyoshi, M., Maat, P., Mann, G., McKay-Bukowski, D., Mevius, M., Morganti, R., Munk, H., Offringa, A. R., Orru, E., Paas, H., Pandey, V. N., Pietka, G., Pizzo, R., Polatidis, A. G., Renting, A., Rowlinson, A., Schwarz, D., Serylak, M., Sluman, J., Smirnov, O., Stappers, B. W., Stewart, A., Swinbank, J., Tagger, M., Tang, Y., Thoudam, S., Toribio, C., Vermeulen, R., Vocks, C., Zarka, P.
We present LOFAR Low Band observations of the Bootes and 3C295 fields. Our images made at 34, 46, and 62 MHz reach noise levels of 12, 8, and 5 mJy beam$^{-1}$, making them the deepest images ever obtained in this frequency range. In total, we detect
Externí odkaz:
http://arxiv.org/abs/1409.5437
Akademický článek
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Publikováno v:
In Additive Manufacturing October 2019 29