Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Girard, J N"'
Autor:
Munshi, S., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Semelin, B., Aubert, D., Barkana, R., Bracco, A., Brackenhoff, S. A., Cecconi, B., Ceccotti, E., Corbel, S., Fialkov, A., Gehlot, B. K., Ghara, R., Girard, J. N., Grießmeier, J. M., Höfer, C., Hothi, I., Mériot, R., Mevius, M., Ocvirk, P., Shaw, A. K., Theureau, G., Yatawatta, S., Zarka, P., Zaroubi, S.
Publikováno v:
A&A 681, A62 (2024)
The redshifted 21 cm signal from neutral hydrogen is a direct probe of the physics of the early universe and has been an important science driver of many present and upcoming radio interferometers. In this study we use a single night of observations
Externí odkaz:
http://arxiv.org/abs/2311.05364
Autor:
Nammour, F., Akhaury, U., Girard, J. N., Lanusse, F., Sureau, F., Ali, C. Ben, Starck, J. -L.
Publikováno v:
A&A 663, A69 (2022)
Deep Learning (DL) has shown remarkable results in solving inverse problems in various domains. In particular, the Tikhonet approach is very powerful to deconvolve optical astronomical images (Sureau et al. 2020). Yet, this approach only uses the $\e
Externí odkaz:
http://arxiv.org/abs/2203.07412
Autor:
Bilous, A. V., Griessmeier, J. M., Pennucci, T., Wu, Z., Bondonneau, L., Kondratiev, V., van Leeuwen, J., Maan, Y., Connor, L., Oostrum, L. C., Petroff, E., Verbiest, J. P. W., Vohl, D., McKee, J. W., Shaifullah, G., Theureau, G., Ulyanov, O. M., Cecconi, B., Coolen, A. H., Corbel, S., Damstra, S., Denes, H., Girard, J. N., Hut, B., Ivashina, M., Konovalenko, O. O., Kutkin, A., Loose, G. M., Mulder, H., Ruiter, M., Smits, R., Tokarsky, P. L., Vermaas, N. J., Zakharenko, V. V., Zarka, P., Ziemke, J.
Publikováno v:
A&A 658, A143 (2022)
PSR B0950+08 is a bright non-recycled pulsar whose single-pulse fluence variability is reportedly large. Based on observations at two widely separated frequencies, 55 MHz (NenuFAR) and 1.4 GHz (Westerbork Synthesis Radio Telescope), we review the pro
Externí odkaz:
http://arxiv.org/abs/2109.08500
Autor:
Agar, C. H., Weltevrede, P., Bondonneau, L., Grießmeier, J. -M., Hessels, J. W. T., Huang, W. J., Karastergiou, A., Keith, M. J., Kondratiev, V. I., Künsemöller, J., Li, D., Peng, B., Sobey, C., Stappers, B. W., Tan, C. M., Theureau, G., Wang, H. G., Zhang, C. M., Cecconi, B., Girard, J. N., Loh, A., Zarka, P.
We present radio observations of the most slowly rotating known radio pulsar PSR J0250+5854. With a 23.5 s period, it is close, or even beyond, the $P$-$\dot{P}$ diagram region thought to be occupied by active pulsars. The simultaneous observations w
Externí odkaz:
http://arxiv.org/abs/2109.00266
Autor:
Bondonneau, L., Grießmeier, J. -M., Theureau, G., Cognard, I., Brionne, M., Kondratiev, V., Bilous, A., McKee, J. W., Zarka, P., Viou, C., Guillemot, L., Chen, S., Main, R., Pilia, M., Possenti, A., Serylak, M., Shaifullah, G., Tiburzi, C., Verbiest, J. P. W., Wu, Z., Wucknitz, O., Yerin, S., Briand, C., Cecconi, B., Corbel, S., Dallier, R., Loh, A., Martin, L., Girard, J. N., Tasse, C.
Publikováno v:
A&A 652, A34 (2021)
NenuFAR (New extension in Nan\c{c}ay upgrading LoFAR) is a new radio telescope developed and built on the site of the Nan\c{c}ay Radio Observatory. It is designed to observe the largely unexplored frequency window from 10 to 85\,MHz, offering a high
Externí odkaz:
http://arxiv.org/abs/2009.02076
Autor:
Asad, K. M. B., Girard, J. N., de Villers, M., Ansah-Narh, T., Iheanetu, K., Smirnov, O., Santos, M. G., Lehmensiek, R., Jonas, J., de Villiers, D. I. L., Thorat, K., Hugo, B., Makhathini, S., Jozsa, G. I. G., Sirothia, S. K.
After a decade of design and construction, South Africa's SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield capability of the array, it is imperative that we have an accurate model of the primary beam of it
Externí odkaz:
http://arxiv.org/abs/1904.07155
Autor:
Iheanetu, K., Girard, J. N., Smirnov, O., Asad, K. M. B., de Villiers, M., Thorat, K., Makhathini, S., Perley, R. A.
Modern interferometric imaging relies on advanced calibration that incorporates direction-dependent effects. Their increasing number of antennas (e.g. in LOFAR, VLA, MeerKAT/SKA) and sensitivity are often tempered with the accuracy of their calibrati
Externí odkaz:
http://arxiv.org/abs/1903.02486
Imaging by aperture synthesis from interferometric data is a well-known, but is a strong ill-posed inverse problem. Strong and faint radio sources can be imaged unambiguously using time and frequency integration to gather more Fourier samples of the
Externí odkaz:
http://arxiv.org/abs/1512.06548
Autor:
Girard, J. N., Zarka, P., Tasse, C., Hess, S., de Pater, I., Santos-Costa, D., Nenon, Q., Sicard, A., Bourdarie, S., Anderson, J., Asgekar, A., Bell, M. E., van Bemmel, I., Bentum, M. J., Bernardi, G., Best, P., Bonafede, A., Breitling, F., Breton, R. P., Broderick, J. W., Brouw, W. N., Brüggen, M., Ciardi, B., Corbel, S., Corstanje, A., de Gasperin, F., de Geus, E., Deller, A., Duscha, S., Eislöffel, J., Falcke, H., Frieswijk, W., Garrett, M. A., Grießmeier, J., Gunst, A. W., Hessels, J. W. T., Hoeft, M., Hörandel, J., Iacobelli, M., Juette, E., Kondratiev, V. I., Kuniyoshi, M., Kuper, G., van Leeuwen, J., Loose, M., Maat, P., Mann, G., Markov, S., McFadden, R., McKay-Bukowski, D., Moldon, J., Munk, H., Nelles, A., Norden, M. J., Orru, E., Paas, H., Pandey-Pommier, M., Pizzo, R., Polatidis, A. G., Reich, W., Röttgering, H., Rowlinson, A., Schwarz, D., Smirnov, O., Steinmetz, M., Swinbank, J., Tagger, M., Thoudam, S., Toribio, M. C., Vermeulen, R., Vocks, C., van Weeren, R. J., Wijers, R. A. M. J., Wucknitz, O.
Publikováno v:
A&A 587, A3 (2016)
Context. Observing Jupiter's synchrotron emission from the Earth remains today the sole method to scrutinize the distribution and dynamical behavior of the ultra energetic electrons magnetically trapped around the planet (because in-situ particle dat
Externí odkaz:
http://arxiv.org/abs/1511.09118
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