Zobrazeno 1 - 10
of 402
pro vyhledávání: '"Junklewitz, H."'
Autor:
Govoni, F., Orrù, E., Bonafede, A., Iacobelli, M., Paladino, R., Vazza, F., Murgia, M., Vacca, V., Giovannini, G., Feretti, L., Loi, F., Bernardi, G., Ferrari, C., Pizzo, R. F., Gheller, C., Manti, S., Brüggen, M., Brunetti, G., Cassano, R., de Gasperin, F., Enßlin, T. A., Hoeft, M., Horellou, C., Junklewitz, H., Röttgering, H. J. A., Scaife, A. M. M., Shimwell, T. W., van Weeren, R. J., Wise, M.
Publikováno v:
Science 2019, Volume 364, Issue 6444, pp. 981-984
Galaxy clusters are the most massive gravitationally bound structures in the Universe. They grow by accreting smaller structures in a merging process that produces shocks and turbulence in the intra-cluster gas. We observed a ridge of radio emission
Externí odkaz:
http://arxiv.org/abs/1906.07584
Autor:
Vacca, V., Murgia, M., Govoni, F., Loi, F., Vazza, F., Finoguenov, A., Carretti, E., Feretti, L., Giovannini, G., Concu, R., Melis, A., Gheller, C., Paladino, R., Poppi, S., Valente, G., Bernardi, G., Boschin, W., Brienza, M., Clarke, T. E., Colafrancesco, S., Ensslin, T. E., Ferrari, C., de Gasperin, F., Gastaldello, F., Girardi, M., Gregorini, L., Johnston-Hollitt, M., Junklewitz, H., Orru, E., Parma, P., Perley, R., Taylor, G. B
We report the detection of diffuse radio emission which might be connected to a large-scale filament of the cosmic web covering a 8deg x 8deg area in the sky, likely associated with a z~0.1 over-density traced by nine massive galaxy clusters. In this
Externí odkaz:
http://arxiv.org/abs/1804.09199
Autor:
Farnes, J. S., Heald, G., Junklewitz, H., Mulcahy, D. D., Haverkorn, M., Van Eck, C. L., Riseley, C. J., Brentjens, M., Horellou, C., Vacca, V., Jones, D. I., Horneffer, A., Paladino, R.
The optimal source-finding strategy for linear polarization data is an unsolved problem, with many inhibitive factors imposed by the technically-challenging nature of polarization observations. Such an algorithm is essential for Square Kilometre Arra
Externí odkaz:
http://arxiv.org/abs/1711.04516
Autor:
Loi, F., Murgia, M., Govoni, F., Vacca, V., Feretti, L., Giovannini, G., Carretti, E., Gastaldello, F., Girardi, M., Vazza, F., Concu, R., Melis, A., Paladino, R., Poppi, S., Valente, G., Boschin, W., Clarke, T. E., Colafrancesco, S., Enßlin, T., Ferrari, C., de Gasperin, F., Gregorini, L., Johnston-Hollitt, M., Junklewitz, H., Orrù, E., Parma, P., Perley, R., Taylor, G. B
We observed the galaxy cluster CIZA J2242.8+5301 with the Sardinia Radio Telescope to provide new constraints on its spectral properties at high frequency. We conducted observations in three frequency bands centred at 1.4 GHz, 6.6 GHz and 19 GHz, res
Externí odkaz:
http://arxiv.org/abs/1708.07125
Sardinia Radio Telescope observations of Abell 194 - the intra-cluster magnetic field power spectrum
Autor:
Govoni, F., Murgia, M., Vacca, V., Loi, F., Girardi, M., Gastaldello, F., Giovannini, G., Feretti, L., Paladino, R., Carretti, E., Concu, R., Melis, A., Poppi, S., Valente, G., Bernardi, G., Bonafede, A., Boschin, W., Brienza, M., Clarke, T. E., Colafrancesco, S., de Gasperin, F., Eckert, D., Ensslin, T. A., Ferrari, C., Gregorini, L., Johnston-Hollitt, M., Junklewitz, H., Orru', E., Parma, P., Perley, R., Rossetti, M., Taylor, G. B, Vazza, F.
Publikováno v:
A&A 603, A122 (2017)
We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands. We analyze new total intensity and polarization observations of Abell 194
Externí odkaz:
http://arxiv.org/abs/1703.08688
Autor:
Vacca, V., Oppermann, N., Ensslin, T., Jasche, J., Selig, M., Greiner, M., Junklewitz, H., Reinecke, M., Brueggen, M., Carretti, E., Feretti, L., Ferrari, C., Hales, C. A., Horellou, C., Ideguchi, S., Johnston-Hollitt, M., Pizzo, R. F., Roettgering, H., Shimwell, T. W., Takahashi, K.
Publikováno v:
A&A 591, A13 (2016)
Determining magnetic field properties in different environments of the cosmic large-scale structure as well as their evolution over redshift is a fundamental step toward uncovering the origin of cosmic magnetic fields. Radio observations permit the s
Externí odkaz:
http://arxiv.org/abs/1509.00747
Autor:
Mulcahy, D. D., Horneffer, A., Beck, R., Heald, G., Fletcher, A., Scaife, A., Adebahr, B., Anderson, J. M., Bonafede, A., Brüggen, M., Brunetti, G., Chyży, K. T., Conway, J., Dettmar, R-J., Enßlin, T., Haverkorn, M., Horellou, C., Iacobelli, M., Israel, F. P., Junklewitz, H., Jurusik, W., Köhler, J., Kuniyoshi, M., Orrú, E., Paladino, R., Pizzo, R., Reich, W., Röttgering, H. J. A.
Publikováno v:
A&A 568, A74 (2014)
The grand-design spiral galaxy M51 was observed with the LOFAR High Frequency Antennas (HBA) and imaged in total intensity and polarisation. This observation covered the frequencies between 115 MHz and 175 MHz. We produced an image of total emission
Externí odkaz:
http://arxiv.org/abs/1407.1312
We present a new approach to multi-frequency synthesis in radio astronomy. Using Bayesian inference techniques, the new technique estimates the sky brightness and the spectral index simultaneously. In principle, the bandwidth of a wide-band observati
Externí odkaz:
http://arxiv.org/abs/1401.4711
Publikováno v:
A&A 586, A76 (2016)
We present RESOLVE, a new algorithm for radio aperture synthesis imaging of extended and diffuse emission in total intensity. The algorithm is derived using Bayesian statistical inference techniques, estimating the surface brightness in the sky assum
Externí odkaz:
http://arxiv.org/abs/1311.5282
Autor:
Iacobelli, M., Haverkorn, M., Orrú, E., Pizzo, R. F., Anderson, J., Beck, R., Bell, M. R., Bonafede, A., Chyzy, K., Dettmar, R. -J., Enßlin, T. A., Heald, G., Horellou, C., Horneffer, A., Jurusik, W., Junklewitz, H., Kuniyoshi, M., Mulcahy, D. D., Paladino, R., Reich, W., Scaife, A., Sobey, C., Sotomayor-Beltran, C., Alexov, A., Asgekar, A., Avruch, I. M., Bell, M. E., van Bemmel, I., Bentum, M. J., Bernardi, G., Best, P., Birzan, L., Breitling, F., Broderick, J., Brouw, W. N., Bruggen, M., Butcher, H. R., Ciardi, B., Conway, J. E., de Gasperin, F., de Geus, E., Duscha, S., Eisloffel, J., Engels, D., Falcke, H., Fallows, R. A., Ferrari, C., Frieswijk, W., Garrett, M. A., Griessmeier, J., Gunst, A. W., Hamaker, J. P., Hassall, T. E., Hessels, J. W. T., Hoeft, M., Horandel, J., Jelic, V., Karastergiou, A., Kondratiev, V. I., Koopmans, L. V. E., Kramer, M., Kuper, G., van Leeuwen, J., Macario, G., Mann, G., McKean, J. P., Munk, H., Pandey-Pommier, M., Polatidis, A. G., Röttgering, H., Schwarz, D., Sluman, J., Smirnov, O., Stappers, B. W., Steinmetz, M., Tagger, M., Tang, Y., Tasse, C., Toribio, C., Vermeulen, R., Vocks, C., Vogt, C., van Weeren, R. J., Wise, M. W., Wucknitz, O., Yatawatta, S., Zarka, P., Zensus, A.
The characteristic outer scale of turbulence and the ratio of the random to ordered components of the magnetic field are key parameters to characterise magnetic turbulence in the interstellar gas, which affects the propagation of cosmic rays within t
Externí odkaz:
http://arxiv.org/abs/1308.2804