Zobrazeno 1 - 10
of 679
pro vyhledávání: '"Smits, R. A."'
Autor:
Adams, Elizabeth A. K., Adebahr, B., de Blok, W. J. G., Denes, H., Hess, K. M., van der Hulst, J. M., Kutkin, A., Lucero, D. M., Morganti, R., Moss, V. A., Oosterloo, T. A., Orru, E., Schulz, R., van Amesfoort, A. S., Berger, A., Boersma, O. M., Bouwhuis, M., Brink, R. van den, van Cappellen, W. A., Connor, L., Coolen, A. H. W. M., Damstra, S., van Diepen, G. N. J., Dijkema, T. J., Ebbendorf, N., Grange, Y. G., de Goei, R., Gunst, A. W., Holties, H. A., Hut, B., Ivashina, M. V., Jozsa, G. I. G., Loose, G. M., van Leeuwen, J., Maan, Y., Mancini, M., Mika, A., Mulder, H., Norden, M. J., Offringa, A. R., Oostrum, L. C., Pastor-Marazuela, I., Pisano, D. J., Ponomareva, A. A., Romein, J. W., Ruiter, M, Schoenmakers, A. P., van der Schuur, D., Sluman, J. J., Smits, R., Stuurwold, K. J. C, Verstappen, J., Vilchez, N. P. E, Vohl, D., Wierenga, K. J., Wijnholds, S. J., Woestenburg, E. E. M., Zanting, A. W., Ziemke, J.
Publikováno v:
A&A 667, A38 (2022)
(Abridged) Apertif is a phased-array feed system for WSRT, providing forty instantaneous beams over 300 MHz of bandwidth. A dedicated survey program started on 1 July 2019, with the last observations taken on 28 February 2022. We describe the release
Externí odkaz:
http://arxiv.org/abs/2208.05348
Autor:
Dénes, H., Hess, K. M., Adams, E. A. K., Kutkin, A., Morganti, R., van der Hulst, J. M., Oosterloo, T. A., Moss, V. A., Adebahr, B., de Blok, W. J. G., Ivashina, M. V., Coolen, A. H. W. M., Damstra, S., Hut, B., Loose, G. M., Lucero, D. M., Maan, Y., Mika, Á., Norden, M. J., Oostrum, L. C., Pisano, D. J., Smits, R., van Cappellen, W. A., Brink, R. van den, van der Schuur, D., van Diepen, G. N. J., van Leeuwen, J., Vohl, D., Wijnholds, S. J., Ziemke, J.
Publikováno v:
A&A 667, A40 (2022)
Context. Phased Array Feeds (PAFs) are multi element receivers in the focal plane of a telescope that make it possible to form simultaneously multiple beams on the sky by combining the complex gains of the individual antenna elements. Recently the We
Externí odkaz:
http://arxiv.org/abs/2205.09662
Autor:
Adebahr, B., Berger, A., Adams, E. A. K., Hess, K. M., de Blok, W. J. G., Dénes, H., Moss, V. A., Schulz, R., van der Hulst, J. M., Connor, L., Damstra, S., Hut, B., Ivashina, M. V., Loose, G. M., Maan, Y., Mika, A., Mulder, H., Norden, M. J., Oostrum, L. C., Orrú, E., Ruiter, M., Smits, R., van Cappellen, W. A., van Leeuwen, J., Vermaas, N. J., Vohl, D., Ziemke, J.
Publikováno v:
A&A 663, A103 (2022)
We analyse five early science datasets from the APERture Tile in Focus (Apertif) phased array feed system to verify the polarisation capabilities of Apertif in view of future larger data releases. We aim to characterise the source population of the p
Externí odkaz:
http://arxiv.org/abs/2203.16925
Autor:
Pastor-Marazuela, Inés, van Leeuwen, Joeri, Bilous, Anna, Connor, Liam, Maan, Yogesh, Oostrum, Leon, Petroff, Emily, Straal, Samayra, Vohl, Dany, Adams, E. A. K., Adebahr, B., Attema, Jisk, Boersma, Oliver M., Brink, R. van den, van Cappellen, W. A., Coolen, A. H. W. M., Damstra, S., Dénes, H., Hess, K. M., van der Hulst, J. M., Hut, B., Kutkin, A., Loose, G. Marcel, Lucero, D. M., Mika, Á., Moss, V. A., Mulder, H., Norden, M. J., Oosterloo, T. A., Rajwade, Kaustubh, van der Schuur, D., Sclocco, A., Smits, R., Ziemke, J.
Publikováno v:
A&A 678, A149 (2023)
Fast radio bursts (FRBs) are extragalactic radio transients of extraordinary luminosity. Studying the diverse temporal and spectral behaviour recently observed in a number of FRBs may help determine the nature of the entire class. For example, a fast
Externí odkaz:
http://arxiv.org/abs/2202.08002
Autor:
Adebahr, B., Schulz, R., Dijkema, T. J., Moss, V. A., Offringa, A. R., Kutkin, A., van der Hulst, J. M., Frank, B. S., Vilchez, N. P. E., Verstappen, J., Adams, E. K., de Blok, W. J. G., Denes, H., Hess, K. M., Lucero, D., Morganti, R., Oosterloo, T., Pisano, D. -J., Ivashina, M. V., van Cappellen, W. A., Connor, L. D., Coolen, A. H. W. M., Damstra, S., Loose, G. M., Maan, Y., Maccagni, F. M., Mika, A., Mulder, H., Oostrum, L. C., Orru, E., Smits, R., van der Schuur, D., van Leeuwen, J., Vohl, D., Wijnholds, S. J., Ziemke, J.
Publikováno v:
Astronomy and Computing 38 (2022) 100514
Apertif (APERture Tile In Focus) is one of the Square Kilometre Array (SKA) pathfinder facilities. The Apertif project is an upgrade to the 50-year-old Westerbork Synthesis Radio Telescope (WSRT) using phased-array feed technology. The new receivers
Externí odkaz:
http://arxiv.org/abs/2112.03722
Autor:
Purver, M., Bassa, C. G., Cognard, I., Janssen, G. H., Karuppusamy, R., Kramer, M., Lee, K. J., Liu, K., McKee, J. W., Perrodin, D., Sanidas, S., Smits, R., Stappers, B. W.
Publikováno v:
MNRAS, 510, 1597 (2022)
We describe how to implement the spectral kurtosis method of interference removal (zapping) on a digitized signal of averaged power values. Spectral kurtosis is a hypothesis test, analogous to the t-test, with a null hypothesis that the amplitudes fr
Externí odkaz:
http://arxiv.org/abs/2111.14225
Autor:
van Cappellen, W. A., Oosterloo, T. A., Verheijen, M. A. W., Adams, E. A. K., Adebahr, B., Braun, R., Hess, K. M., Holties, H., van der Hulst, J. M., Hut, B., Kooistra, E., van Leeuwen, J., Loose, G. M., Morganti, R., Moss, V. A., Orrú, E., Ruiter, M., Schoenmakers, A. P., Vermaas, N. J., Wijnholds, S. J., van Amesfoort, A. S., Arts, M. J., Attema, J. J., Bakker, L., Bassa, C. G., Bast, J. E., Benthem, P., Beukema, R., Blaauw, R., de Blok, W. J. G., Bouwhuis, M., Brink, R. H. van den, Connor, L., Coolen, A. H. W. M., Damstra, S., van Diepen, G. N. J., de Goei, R., Dénes, H., Drost, M., Ebbendorf, N., Frank, B. S., Gardenier, D. W., Gerbers, M., Grange, Y. G., Grit, T., Gunst, A. W., Gupta, N., Ivashina, M. V., Józsa, G. I. G., Janssen, G. H., Koster, A., Kruithof, G. H., Kuindersma, S. J., Kutkin, A., Lucero, D. M., Maan, Y., Maccagni, F. M., van der Marel, J., Mika, A., Morawietz, J., Mulder, H., Mulder, E., Norden, M. J., Offringa, A. R., Oostrum, L. C., Overeem, R. E., Paragi, Z., Pepping, H. J., Petroff, E., Pisano, D. J., Polatidis, A. G., Prasad, P., de Reijer, J. P. R., Romein, J. W., Schaap, J., Schoonderbeek, G. W., Schulz, R., van der Schuur, D., Sclocco, A., Sluman, J. J., Smits, R., Stappers, B. W., Straal, S. M., Stuurwold, K. J. C., Verstappen, J., Vohl, D., Wierenga, K. J., Woestenburg, E. E. M., Zanting, A. W., Ziemke, J.
Publikováno v:
A&A 658, A146 (2022)
We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of the Westerbork Synthesis Radio Telescope which has transformed this telescope into a high-sensitivity, wide field-of-view L-band imaging and transient surve
Externí odkaz:
http://arxiv.org/abs/2109.14234
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:
Boersma, Olivér, van Leeuwen, Joeri, Adams, Elizabeth A. K., Adebahr, Björn, Kutkin, Alexander, Oosterloo, Tom, de Blok, W. J. G., Brink, R. van den, Coolen, A. H. W. M., Connor, L., Damstra, S., Dénes, H., Hess, K. M., van der Hulst, J. M., Hut, B., Ivashina, M., Loose, G. M., Lucero, D. M., Maan, Y., Mika, Á., Moss, V. A., Mulder, H., Oostrum, L. C., Ruiter, M., van der Schuur, D., Smits, R., Vermaas, N. J., Vohl, D., Ziemke, J.
Publikováno v:
A&A 650, A131 (2021)
Detection of the electromagnetic emission from coalescing binary neutron stars (BNS) is important for understanding the merger and afterglow. We present a search for a radio counterpart to the gravitational-wave source GW190425, a BNS merger, using A
Externí odkaz:
http://arxiv.org/abs/2104.04280
Autor:
Connor, Liam, van Leeuwen, Joeri, Oostrum, L. C., Petroff, E., Maan, Yogesh, Adams, E. A. K., Attema, J. J., Bast, J. E., Boersma, O. M., Dénes, H., Gardenier, D. W., Hargreaves, J. E., Kooistra, E., Pastor-Marazuela, I., Schulz, R., Sclocco, A., Smits, R., Straal, S. M., van der Schuur, D., Vohl, Dany, Adebahr, B., de Blok, W. J. G., van Cappellen, W. A., Coolen, A. H. W. M., Damstra, S., van Diepen, G. N. J., Frank, B. S., Hess, K. M., Hut, B., Loose, G. Marcel, Lucero, D. M., Mika, Á., Moss, V. A., Mulder, H., Oosterloo, T. A., Ruiter, M., Vedantham, H., Vermaas, N. J., Wijnholds, S. J., Ziemke, J.
We report the detection of a bright fast radio burst, FRB\,191108, with Apertif on the Westerbork Synthesis Radio Telescope (WSRT). The interferometer allows us to localise the FRB to a narrow $5\arcsec\times7\arcmin$ ellipse by employing both multib
Externí odkaz:
http://arxiv.org/abs/2002.01399