Search Results - "particle accelerator"

Observations of Particle Acceleration in the Blast Waves of Gamma-Ray Bursts by Curran, Peter

“…This acceleration process is applicable to a myriad of astronomical jet sources such as AGN, X-ray binaries and gamma-ray bursts (GRBs), as well as to particle acceleration in the solar wind and supernovae, and the acceleration of cosmic rays. …”
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Ultra-steep spectrum emission in the merging galaxy cluster Abell 1914 by Mandal, S., Intema, Huib, Shimwell, T.W., Van Weeren, R.J., Botteon, A., Röttgering, H.J.A., Hoang, D.N., Brunetti, G., De Gasperin, F., Giacintucci, S., Hoekstra, H., Stroe, A., Brüggen, M., Cassano, R., Shulevski, A., Drabent, A., Rafferty, D.

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Radio observations of the merging galaxy cluster Abell 520 by Hoang, D.N., Shimwell, T.W., Van Weeren, R.J., Brunetti, G., Röttgering, H.J.A., Andrade-Santos, F., Botteon, A., Brüggen, M., Cassano, R., Drabent, A., De Gasperin, F., Hoeft, M., Intema, Huib, Rafferty, D.A., Shweta, A., Stroe, A.

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Infrared interferometry to spatially and spectrally resolve jets in X-ray binaries by Markoff, S., Russell, D.M., Dexter, J., Pfuhl, O., Eisenhauer, F., Abuter, R., Miller-Jones, James, Russell, T.D.

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ALMA observations of A0620–00: Fresh clues on the nature of quiescent black hole X-ray binary jets by Gallo, E., Teague, R., Plotkin, Richard, Miller-Jones, James, Russell, D.M., Dinçer, T., Bailyn, C., Maccarone, T.J., Markoff, S., Fender, R.P.

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A new lepto-hadronic model applied to the first simultaneous multiwavelength data set for Cygnus X-1 by Kantzas, D., Markoff, S., Beuchert, T., Lucchini, M., Chhotray, A., Ceccobello, C., Tetarenko, A.J., Miller-Jones, James, Bremer, M., Garcia, J.A., Grinberg, V., Uttley, P., Wilms, J.

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MeerKAT discovery of radio emission from the Vela X-1 bow shock by Van Den Eijnden, J., Heywood, I., Fender, R., Mohamed, S., Sivakoff, G.R., Saikia, P., Russell, T.D., Motta, S., Miller-Jones, James, Woudt, P.A.

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Rapid compact jet quenching in the Galactic black hole candidate X-ray binary MAXI J1535−571 by Russell, T.D., Lucchini, M., Tetarenko, A.J., Miller-Jones, James, Sivakoff, G.R., Krauß, F., Mulaudzi, W., Baglio, M.C., Russell, D.M., Altamirano, D., Ceccobello, C., Corbel, S., Degenaar, N., van den Eijnden, J., Fender, R., Heinz, S., Koljonen, K.I.I., Maitra, D., Markoff, S., Migliari, S., Parikh, A.S., Plotkin, Richard, Rupen, M., Sarazin, C., Soria, Roberto, Wijnands, R.

“…Estimating the magnetic field and size of the particle acceleration region shows that the rapid fading of the high-energy jet emission was not consistent with radiative cooling; instead, the particle acceleration region seems to be moving away from the black hole on approximately dynamical time-scales. …”
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Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT by Abdo, A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M., Bastieri, D., Baughman, B., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R., Bloom, E., Bonamente, E., Borgland, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Burnett, T., Buson, S., Caliandro, G., Cameron, R., Caraveo, P., Casandjian, J., Cecchi, C., Celik, O., Chekhtman, A., Cheung, C., Chiang, J., Ciprini, S., Claus, R., Cognard, I., Cohen-Tanugi, J., Cominsky, L., Conrad, J., Cutini, S., Dermer, C., de Angelis, A., de Palma, F., Digel, S., Do Couto e Silva, E., Drell, P., Dubois, R., Dumora, D., Espinoza, C., Farmer, C., Favuzzi, C., Fegan, S., Focke, W., Fortin, P., Frailis, M., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giavitto, G., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., Grenier, I., Grondin, M., Grove, J., Guillemot, L., Guiriec, S., Hanabata, Y., Harding, A., Hayashida, M., Hays, E., Hughes, R., Jackson, M., Johannesson, G., Johnson, A., Johnson, T., Johnson, W., Kamae, T., Katagiri, H., Kataoka, J., Katsuta, J., Kawai, N., Kerr, M., Knödlseder, J., Kocian, M., Kramer, M., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., Lovellette, M., Lubrano, P., Lyne, A., Madejski, G., Makeev, A., Mazziotta, M., McEnery, J., Meurer, C., Michelson, P., Mitthumsiri, W., Mizuno, T., Monte, C., Monzani, M., Morselli, A., Moskalenko, I., Murgia, S., Nakamori, T., Nolan, P., Noms, J., Noutsos, A., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J., Paneque, D., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T., Raino, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Rodriguez, A., Romani, R., Roth, M., Ryde, F., Sadrozinski, H., Sanchez, D., Sander, A., Saz Parkinson, P., Scargle, J., Sgro, C., Siskind, E., Smith, D., Smith, P., Spandre, G., Spinelli, P., Stappers, B., Stecker, F., Strikman, M., Suson, D., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J., Thayer, J., Theureau, G., Thompson, D., Tibaldo, L., Tibolla, Omar, Torres, D., Tosti, G., Tramacere, A., Uchiyama, Y., Usher, T., Vasileiou, V., Venter, C., Vilchez, N., Vitale, V., Waite, A., Wang, P., Winer, B., Wood, K., Yamazaki, R., Ylinen, T., Ziegler, M.

“…The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. …”
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Filaments in the southern giant lobe of Centaurus A: Constraints on nature and origin from modelling and GMRT observations by Wykes, S., Intema, Hubertus, Hardcastle, M., Achterberg, A., Jones, T., Jerjen, H., Orrú, E., Lazarian, A., Shimwell, T., Wise, M., Kronberg, P.

“…We seek to constrain the nature and origin of the vertex and vortex filaments associated with the lobe and their role in high-energy particle acceleration. We deduce that these filaments are at most mildly overpressuredwith respect to the global lobe plasma showing no evidence of largescale efficient Fermi I-type particle acceleration, and persist for ~2-3 Myr. …”
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LOFAR reveals the giant: A low-frequency radio continuum study of the outflow in the nearby FR I radio galaxy 3C 31 by Heesen, V., Croston, J., Morganti, R., Hardcastle, M., Stewart, A., Best, P., Broderick, J., Brüggen, M., Brunetti, G., Chyzy, K., Harwood, J., Haverkorn, M., Hess, K., Intema, Hubertus, Jamrozy, M., Kunert-Bajraszewska, M., McKean, J., Orrú, E., Röttgering, H., Shimwell, T., Shulevski, A., White, G., Wilcots, E., Williams, W.

“…We find that if there is no in situ particle acceleration in the tails, then decelerating flows are required that depend on radius r as v a rß (ß ˜ -1). …”
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Structure in the radio counterpart to the 2004 December 27 giant flare from SGR 1806-20 by Fender, R., Muxlow, T., Garrett, M., Kouveliotou, C., Gaensler, B., Garrington, S., Paragi, Z., Tudose, V., Miller-Jones, James, Spencer, R., Wijers, R., Taylor, G.

“…This structure may correspond to localized sites of particle acceleration during the early phases of expansion and interaction with the ambient medium.…”
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Rocking the lighthouse: Circumpulsar asteroids and radio intermittency by Cordes, J., Shannon, Ryan

“…This paper considers asteroids that form from supernova fallback material and how they migrate into the pulsar light cylinder before evaporating, ionizing, and perturbing particle acceleration regions. Such intrusion is expected primarily for pulsars with long spin periods and relatively cool surfaces. …”
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Precision measurements of cosmic ray air showers with the SKA by Huege, T., Bray, J., Buitink, S., Dallier, R., Ekers, Ronald, Falcke, H., James, C., Martin, L., Revenu, B., Scholten, O., Schröder, F.

“…This would enable a wealth of scientific applications: The physics of the transition from Galactic to extragalactic cosmic rays could be probed with very high precision mass measurements, hadronic interactions could be studied up to energies well beyond the reach of man-made particle accelerators, air shower tomography could be performed with very high spatial resolution exploiting the large instantaneous bandwith and very uniform instantaneous u-v coverage of SKA1-LOW, and the physics of thunderstorms and possible connections between cosmic rays and lightning initiation could be studied in unprecedented levels of detail. …”
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A LOFAR study of non-merging massive galaxy clusters by Savini, F., Bonafede, A., Brüggen, M., Rafferty, D., Shimwell, T., Botteon, A., Brunetti, G., Intema, Huib, Wilber, A., Cassano, R., Vazza, F., Van Weeren, R., Cuciti, V., De Gasperin, F., Röttgering, H., Sommer, M., Bîrzan, L., Drabent, A.

“…Our results might indicate that the sloshing of a dense cool core could trigger particle acceleration on larger scales and generate steep-spectrum radio emission.…”
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Complex diffuse emission in the z = 0.52 cluster PLCK G004.5-19.5 by Albert, J., Sifón, C., Stroe, A., Mernier, F., Intema, Hubertus, Röttgering, H., Brunetti, G.

“…Given that the number of known radio halos and radio relics at z > 0.5 is very limited, PLCK G004.5-19.5 is an important addition to understanding merger-related particle acceleration at higher redshifts.…”
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Relativistic X-Ray Jets from the Black Hole X-Ray Binary MAXI J1820+070 by Espinasse, M., Corbel, S., Kaaret, P., Tremou, E., Migliori, G., Plotkin, Richard, Bright, J., Tomsick, J., Tzioumis, A., Fender, R., Orosz, J.A., Gallo, E., Homan, J., Jonker, P.G., Miller-Jones, James, Russell, D.M., Motta, S.

“…The broadband spectra of the jets are consistent with synchrotron radiation from particles accelerated up to very high energies (>10 TeV) by shocks produced by the jets interacting with the interstellar medium. …”
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First evidence of diffuse ultra-steep-spectrum radio emission surrounding the cool core of a cluster by Savini, F., Bonafede, A., Brüggen, M., van Weeren, R., Brunetti, G., Intema, Hubertus, Botteon, A., Shimwell, T., Wilber, A., Rafferty, D., Giacintucci, S., Cassano, R., Cuciti, V., de Gasperin, F., Röttgering, H., Hoeft, M., White, G.

“…This discovery suggests that, under particular circumstances, both a mini halo and giant halo could co-exist in a single cluster, opening new perspectives for particle acceleration mechanisms in galaxy clusters.…”
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LOFAR imaging of Cygnus A - direct detection of a turnover in the hotspot radio spectra by McKean, J., Godfrey, L., Vegetti, S., Wise, M., Morganti, R., Hardcastle, M., Rafferty, D., Anderson, J., Avruch, I., Beck, R., Bell, M., van Bemmel, I., Bentum, M., Bernardi, G., Best, P., Blaauw, R., Bonafede, A., Breitling, F., Broderick, J., Brueggen, M., Cerrigone, L., Ciardi, B., de Gasperin, F., Deller, A., Duscha, S., Engels, D., Falcke, H., Fallows, R., Frieswijk, W., Garrett, M., Griessmeier, J., van Haarlem, M., Heald, G., Hoeft, M., van der Horst, A., Iacobelli, M., Intema, Hubertus, Juette, E., Karastergiou, A., Kondratiev, V., Koopmans, L., Kuniyoshi, M., Kuper, G., van Leeuwen, J., Maat, P., Mann, G., Markoff, S., McFadden, R., McKay-Bukowski, D., Mulcahy, D., Munk, H., Nelles, A., Orru, E., Paas, H., Pandey-Pommier, M., Pietka, M., Pizzo, R., Polatidis, A., Reich, W., Rottgering, H., Rowlinson, A., Scaife, A., Serylak, M., Shulevski, A., Sluman, J., Smirnov, O., Steinmetz, M., Stewart, A., Swinbank, J., Tagger, M., Thoudam, S., Toribio, M., Vermeulen, R., Vocks, C., van Weeren, R., Wucknitz, O., Yatawatta, S., Zarka, P.

“…These processes are responsible for the dissipation of jet kinetic energy, particle acceleration, and magnetic-field generation. Here, we report new observations of the powerful radio galaxy Cygnus A using the Low Frequency Array (LOFAR) between 109 and 183 MHz, at an angular resolution of ∼3.5 arcsec. …”
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A Connection Between Plasma Conditions Near Black Hole Event Horizons And Outflow Properties by Koljonen, K., Russell, D., Fernández-Ontiveros, J., Markoff, S., Russell, T., Miller-Jones, James, Van Der Horst, A., Bernardini, F., Casella, P., Curran, Peter, Gandhi, P., Soria, Roberto

“…In this paper, we report an unambiguous empirical correlation between the properties of the plasma close to the black hole and the particle acceleration properties within jets launched from the central regions of accreting stellar-mass and supermassive black holes. …”
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