Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Stroe, A." wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
A plethora of diffuse steep spectrum radio sources in Abell 2034 revealed by LOFAR
Autorzy:
Luckin, J.
Bonafede, A.
Sridhar, S. S.
Intema, H. T.
Sabater, J.
Röttgering, H. J. A.
Williams, W. L.
Ferrari, C.
Retana-Montenegro, E.
Orrú, E.
Hoang, D. N.
Heald, G. H.
White, G. J.
Brüggen, M.
Owers, M. S.
Enßlin, T. A.
van Weeren, R. J.
Shimwell, T. W.
Hoeft, M.
Haverkorn, M.
Best, P. N.
Hardcastle, M. J.
de Gasperin, F.
Morabito, L. K.
Horellou, C.
Stroe, A.
McKean, J. P.
Cassano, R.
Brunetti, G.
Pizzo, R.
Chyży, Krzysztof
Opis:
With Low-Frequency Array (LOFAR) observations, we have discovered a diverse assembly of steep spectrum emission that is apparently associated with the intracluster medium (ICM) of the merging galaxy cluster Abell 2034. Such a rich variety of complex emission associated with the ICM has been observed in few other clusters. This not only indicates that Abell 2034 is a more interesting and complex system than previously thought but it also demonstrates the importance of sensitive and high-resolution, low-frequency observations. These observations can reveal emission from relativistic particles which have been accelerated to sufficient energy to produce observable emission or have had their high energy maintained by mechanisms in the ICM. The most prominent feature in our maps is a bright bulb of emission connected to two steep spectrum filamentary structures, the longest of which extends perpendicular to the merger axis for 0.5 Mpc across the south of the cluster. The origin of these objects is unclear, with no shock detected in the X-ray images and no obvious connection with cluster galaxies or AGNs. We also find that the X-ray bright region of the cluster coincides with a giant radio halo with an irregular morphology and a very steep spectrum. In addition, the cluster hosts up to three possible radio relics, which are misaligned with the cluster X-ray emission. Finally, we have identified multiple regions of emission with a very steep spectral index that seem to be associated with either tailed radio galaxies or a shock.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
LOFAR Facet Calibration
Autorzy:
Best, P. N.
Bonafede, A.
Croston, J. H.
Orrú, E.
Miley, G. K.
Jarvis, M. J.
Rafferty, D. A.
Heald, G.
Ogrean, G. A.
Sridhar, S. S.
White, G. J.
Bîrzan, L.
Dijkema, T. J.
Murray, S. S.
Andrade-Santos, F.
Jones, C.
Brüggen, M.
van der Tol, S.
Sarazin, C. L.
Forman, W. R.
Chyży, Krzysztof
Sabater, J.
Intema, H. T.
Brunetti, G.
Dawson, W. A.
Ensslin, T.
Röttgering, H. J. A.
Simionescu, A.
van Weeren, R. J.
Rudnick, L.
Williams, W. L.
Ferrari, C.
de Gasperin, F.
Horellou, C.
Shimwell, T. W.
Hoeft, M.
Hardcastle, M. J.
Mevius, M.
Pizzo, R.
Kraft, R. P.
Cassano, R.
Stroe, A.
Opis:
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 coverage to map diffuse extended emission. However, producing high-quality deep images is challenging due to the presence of direction-dependent calibration errors, caused by imperfect knowledge of the station beam shapes and the ionosphere. Furthermore, the large data volume and presence of station clock errors present additional difficulties. In this paper we present a new calibration scheme, which we name facet calibration, to obtain deep high-resolution LOFAR High Band Antenna images using the Dutch part of the array. This scheme solves and corrects the direction-dependent errors in a number of facets that cover the observed field of view. Facet calibration provides close to thermal noise limited images for a typical 8 hr observing run at ∼ 5'' resolution, meeting the specifications of the LOFAR Tier-1 northern survey.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The LOFAR Multifrequency Snapshot Sky Survey (MSSS) : I. Survey description and first results
Autorzy:
Zarka, P.
Schwarz, D.
Cendes, Y.
Sobey, C.
Iacobelli, M.
Hessels, J. W. T.
Kokotanekov, G.
Wijnholds, S.
Vocks, C.
Duscha, S.
Butcher, H. R.
Thoudam, S.
Mevius, M.
Beck, R.
de Geus, E.
Heesen, V.
Bentum, M. J.
Norden, M. J.
van Weeren, R. J.
Morganti, R.
McFadden, R.
Hamaker, J. P.
Kuper, G.
Macario, G.
Hassall, T.
Pandey-Pommier, M.
Sendlinger, K.
Vilchez, N.
Rowlinson, A.
Carbone, D.
Clarke, A. O.
McKay-Bukowski, D.
Conway, J. E.
Asgekar, A.
van Velzen, S.
Yatawatta, S.
Daiboo, S.
Avruch, I. M.
Martin, P.
Loose, M.
van Leeuwen, J.
Nikiel-Wroczyński, Błażej
Brouw, W. N.
Deller, A.
Vermeulen, R.
Stewart, A. J.
Steinmetz, M.
Stappers, B. W.
Fallows, R. A.
Riseley, C.
Renting, A.
Holties, H. A.
Adebahr, B.
de Vos, M.
ter Veen, S.
Frieswijk, W.
de Bruyn, A. G.
McKean, J. P.
Best, P.
Karastergiou, A.
Wucknitz, O.
Morabito, L. K.
Kuniyoshi, M.
Reich, W.
Vogt, C.
Gregson, J.
Falcke, H.
Toribio, M. C.
Anderson, J.
Tang, Y.
Eislöffel, J.
Noordam, J. E.
Sluman, J.
Kondratiev, V. I.
Orrú, E.
Intema, H.
Nijboer, R.
Hardcastle, M. J.
Gunst, A. W.
Bonafede, A.
Sipior, M.
Garrett, M. A.
Tagger, M.
Klijn, W. F. A.
Hoeft, M.
Ferrari, C.
Dettmar, R.-J.
Williams, W. L.
Carroll, P.
Engels, D.
Pizzo, R. F.
Cantwell, T.
Jelić, V.
Hörandel, J.
Jütte, E.
Trüstedt, J.
de Gasperin, F.
Bernardi, G.
Brentjens, M.
Ciardi, B.
Jurusik, Wojciech
Röttgering, H.
Breton, R. P.
Pandey, V. N.
Rafferty, D.
Breitling, F.
Miller-Jones, J. C. A.
Stroe, A.
Mulcahy, D.
Horneffer, A.
Pietka, M.
Markoff, S.
Grießmeier, J.
Bell, M. E.
Shulevski, A.
Tasse, C.
Broderick, J.
Law, C.
Paas, H.
Scheers, L. H. A.
Kant, D.
Wijers, R. A. M. J.
Arts, M.
Jones, D.
Scaife, A. M. M.
Croston, J.
Pratley, L.
Wise, M.
Bray, J.
Smirnov, O.
Swinbank, J.
Varenius, E.
van Bemmel, I.
Maat, P.
Brüggen, M.
Jackson, N. J.
Sabater, J.
van der Horst, A. J.
Schoenmakers, A.
Heald, G. H.
Koopmans, L. V. E.
Nelles, A.
Offringa, A.
Alexov, A.
de Jong, A.
Munk, H.
Fender, R.
Polatidis, A. G.
Harwood, J.
Bell, M. R.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
    Wyświetlanie 1-7 z 7

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies