Zobrazeno 1 - 10
of 945
pro vyhledávání: '"Sironi, L"'
A ubiquitous feature of accreting black hole systems is their hard X-ray emission which is thought to be produced through Comptonization of soft photons by electrons and positrons in the vicinity of the black hole, in a region with optical depth of o
Externí odkaz:
http://arxiv.org/abs/2410.12638
Recent advances in numerical simulations of magnetically arrested accretion onto supermassive black holes have shed light on the formation and dynamics of magnetospheric current sheets near the black hole horizon. By considering the pair magnetizatio
Externí odkaz:
http://arxiv.org/abs/2406.01211
The mechanisms that generate "seed" magnetic fields in our Universe and that amplify them throughout cosmic time remain poorly understood. By means of fully-kinetic particle-in-cell simulations of turbulent, initially unmagnetized plasmas, we study t
Externí odkaz:
http://arxiv.org/abs/2307.15112
The origins of the various outbursts of hard X-rays from magnetars (highly magnetized neutron stars) are still unknown. We identify instabilities in relativistic magnetospheres that can explain a range of X-ray flare luminosities. Crustal surface mot
Externí odkaz:
http://arxiv.org/abs/2302.07273
Autor:
Adams, C. B., Batshoun, J., Benbow, W., Brill, A., Buckley, J. H., Capasso, M., Cavins, B., Christiansen, J. L., Coppi, P., Errando, M., Farrell, K. A, Feng, Q., Finley, J. P., Foote, G. M., Fortson, L., Furniss, A., Gent, A., Giuri, C., Hanna, D., Hassan, T., Hervet, O., Holder, J., Houck, M., Humensky, T. B., Jin, W., Kaaret, P., Kertzman, M., Kieda, D., Krennrich, F., Kumar, S., Lundy, M., Maier, G., McGrath, C. E, Moriarty, P., Mukherjee, R., Nieto, D., Nievas-Rosillo, M., O'Brien, S., Ong, R. A., Oppenheimer, A., Otte, A. N., Patel, S., Pfrang, K., Pohl, M., Prado, R. R., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Rhatigan, A., Ribeiro, D., Roache, E., Ryan, J. L., Santander, M., Sembroski, G. H., Williams, D. A., Williamson, T. J, Valverde, J., Horan, D., Buson, S., Cheung, C. C., Ciprini, S., Gasparrini, D., Ojha, R., van Zyl, P., Sironi, L.
Flat spectrum radio quasars (FSRQs) are the most luminous blazars at GeV energies, but only rarely emit detectable fluxes of TeV gamma rays, typically during bright GeV flares. We explore the gamma-ray variability and spectral characteristics of thre
Externí odkaz:
http://arxiv.org/abs/2110.13181
Autor:
Mooley, K. P., Margalit, B., Law, C. J., Perley, D. A., Deller, A. T., Lazio, T. J. W., Bietenholz, M. F., Shimwell, T., Intema, H. T., Gaensler, B. M., Metzger, B. D., Dong, D. Z., Hallinan, G., Ofek, E. O., Sironi, L.
We present new radio and optical data, including very long baseline interferometry, as well as archival data analysis, for the luminous decades-long radio transient FIRST J141918.9+394036. The radio data reveal a synchrotron self-absorption peak arou
Externí odkaz:
http://arxiv.org/abs/2107.04703
Autor:
Hajela, A., Margutti, R., Bright, J. S., Alexander, K. D., Metzger, B. D., Nedora, V., Kathirgamaraju, A., Margalit, B., Radice, D., Guidorzi, C., Berger, E., MacFadyen, A., Giannios, D., Chornock, R., Heywood, I., Sironi, L., Gottlieb, O., Coppejans, D., Laskar, T., Cendes, Y., Duran, R. Barniol, Eftekhari, T., Fong, W., McDowell, A., Nicholl, M., Xie, X., Zrake, J., Bernuzzi, S., Broekgaarden, F. S., Kilpatrick, C. D., Terreran, G., Villar, V. A., Blanchard, P. K., Gomez, S., Hosseinzadeh, G., Matthews, D. J., Rastinejad, J. C.
For the first $\sim3$ years after the binary neutron star merger event GW 170817 the radio and X-ray radiation has been dominated by emission from a structured relativistic off-axis jet propagating into a low-density medium with n $< 0.01\,\rm{cm^{-3
Externí odkaz:
http://arxiv.org/abs/2104.02070
Autor:
Ji, H., Karpen, J., Alt, A., Antiochos, S., Baalrud, S., Bale, S., Bellan, P. M., Begelman, M., Beresnyak, A., Bhattacharjee, A., Blackman, E. G., Brennan, D., Brown, M., Buechner, J., Burch, J., Cassak, P., Chen, B., Chen, L. -J., Chen, Y., Chien, A., Comisso, L., Craig, D., Dahlin, J., Daughton, W., DeLuca, E., Dong, C. F., Dorfman, S., Drake, J., Ebrahimi, F., Egedal, J., Ergun, R., Eyink, G., Fan, Y., Fiksel, G., Forest, C., Fox, W., Froula, D., Fujimoto, K., Gao, L., Genestreti, K., Gibson, S., Goldstein, M., Guo, F., Hare, J., Hesse, M., Hoshino, M., Hu, Q., Huang, Y. -M., Jara-Almonte, J., Karimabadi, H., Klimchuk, J., Kunz, M., Kusano, K., Lazarian, A., Le, A., Lebedev, S., Li, H., Li, X., Lin, Y., Linton, M., Liu, Y. -H., Liu, W., Longcope, D., Loureiro, N., Lu, Q. -M., Ma, Z-W., Matthaeus, W. H., Meyerhofer, D., Mozer, F., Munsat, T., Murphy, N. A., Nilson, P., Ono, Y., Opher, M., Park, H., Parker, S., Petropoulou, M., Phan, T., Prager, S., Rempel, M., Ren, C., Ren, Y., Rosner, R., Roytershteyn, V., Sarff, J., Savcheva, A., Schaffner, D., Schoeffier, K., Scime, E., Shay, M., Sironi, L., Sitnov, M., Stanier, A., Swisdak, M., TenBarge, J., Tharp, T., Uzdensky, D., Vaivads, A., Velli, M., Vishniac, E., Wang, H., Werner, G., Xiao, C., Yamada, M., Yokoyama, T., Yoo, J., Zenitani, S., Zweibel, E.
Magnetic reconnection underlies many explosive phenomena in the heliosphere and in laboratory plasmas. The new research capabilities in theory/simulations, observations, and laboratory experiments provide the opportunity to solve the grand scientific
Externí odkaz:
http://arxiv.org/abs/2009.08779
Polarimetric measurements, especially if extended at high energy, are expected to provide important insights into the mechanisms underlying the acceleration of relativistic particles in jets. In a previous work we have shown that the polarization of
Externí odkaz:
http://arxiv.org/abs/2007.08353
Autor:
Hajela, A., Margutti, R., Alexander, K. D., Kathirgamaraju, A., Baldeschi, A., Guidorzi, C., Giannios, D., Fong, W., Wu, Y., MacFadyen, A., Paggi, A., Berger, E., Blanchard, P. K., Chornock, R., Coppejans, D. L., Cowperthwaite, P. S., Eftekhari, T., Gomez, S., Hosseinzadeh, G., Laskar, T., Metzger, B. D., Nicholl, M., Paterson, K., Radice, D., Sironi, L., Terreran, G., Villar, V. A., Williams, P. K. G., Xie, X., Zrake, J.
We present Chandra and VLA observations of GW170817 at ~521-743 days post merger, and a homogeneous analysis of the entire Chandra data set. We find that the late-time non-thermal emission follows the expected evolution from an off-axis relativistic
Externí odkaz:
http://arxiv.org/abs/1909.06393