Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Perley, Richard"'
Autor:
Li, Maggie L., Ho, Anna Y. Q., Ryan, Geoffrey, Perley, Daniel A., Lamb, Gavin P., Nayana, A. J., Andreoni, Igor, Anupama, G. C., Bellm, Eric C., Berger, Edo, Bloom, Joshua S., Burns, Eric, Caiazzo, Ilaria, Chandra, Poonam, Coughlin, Michael W., El-Badry, Kareem, Graham, Matthew J., Kasliwal, Mansi, Keating, Garrett K., Kulkarni, S. R., Kumar, Harsh, Masci, Frank J., Perley, Richard A., Purdum, Josiah, Rao, Ramprasad, Rodriguez, Antonio C., Rusholme, Ben, Sarin, Nikhil, Sollerman, Jesper, Srinivasaragavan, Gokul P., Swain, Vishwajeet, Vanderbosch, Zachary
In the past few years, the improved sensitivity and cadence of wide-field optical surveys have enabled the discovery of several afterglows without associated detected gamma-ray bursts (GRBs). We present the identification, observations, and multiwave
Externí odkaz:
http://arxiv.org/abs/2411.07973
Autor:
Andati, Lexy A. L., Baidoo, Lerato M., Ramaila, Athanaseus J. T., Smirnov, Oleg M., Makhathini, Sphesihle, Perley, Richard A.
We present the results of a polarimetric study from our new high-sensitivity L-band (0.8--1.7 GHz) observation of Pictor A with the MeerKAT radio telescope. We confirm the presence of the radio jet extending from the nucleus to the western hotspot of
Externí odkaz:
http://arxiv.org/abs/2402.17647
Autor:
Perley, Daniel A., Ho, Anna Y. Q., Fausnaugh, Michael, Lamb, Gavin P., Kasliwal, Mansi M., Ahumada, Tomas, Anand, Shreya, Andreoni, Igor, Bellm, Eric, Bhalerao, Varun, Bolin, Bryce, Brink, Thomas G., Burns, Eric, Cenko, S. Bradley, Corsi, Alessandra, Filippenko, Alexei V., Frederiks, Dmitry, Goldstein, Adam, Hamburg, Rachel, Jayaraman, Rahul, Jonker, Peter G., Kool, Erik C., Kulkarni, Shrinivas, Kumar, Harsh, Laher, Russ, Levan, Andrew, Lysenko, Alexandra, Perley, Richard A., Ricker, George R., Riddle, Reed, Ridnaia, Anna, Rusholme, Ben, Smith, Roger, Svinkin, Dmitry, Ulanov, Mikhail, Waratkar, Gaurav, Yao, Yuhan
Classical gamma-ray bursts (GRBs) have two distinct emission episodes: prompt emission from ultra-relativistic ejecta and afterglow from shocked circumstellar material. While both components are extremely luminous in known GRBs, a variety of scenario
Externí odkaz:
http://arxiv.org/abs/2401.16470
Autor:
Baidoo, Lerato, Perley, Richard A., Eilek, Jean, Smirnov, Oleg, Vacca, Valentina, Ensslin, Torsten
We present results of a wideband high-resolution polarization study of Hydra A, one of the most luminous FR I radio galaxies known and amongst the most well-studied. The radio emission from this source displays extremely large Faraday rotation measur
Externí odkaz:
http://arxiv.org/abs/2308.05805
Autor:
Roth, Jakob, Arras, Philipp, Reinecke, Martin, Perley, Richard A., Westermann, Rüdiger, Enßlin, Torsten A.
Publikováno v:
A&A 678, A177 (2023)
Context: Radio interferometers measure frequency components of the sky brightness, modulated by the gains of the individual radio antennas. Due to atmospheric turbulence and variations in the operational conditions of the antennas these gains fluctua
Externí odkaz:
http://arxiv.org/abs/2305.05489
Autor:
Andreoni, Igor, Coughlin, Michael W., Perley, Daniel A., Yao, Yuhan, Lu, Wenbin, Cenko, S. Bradley, Kumar, Harsh, Anand, Shreya, Ho, Anna Y. Q., Kasliwal, Mansi M., Postigo, Antonio de Ugarte, Sagues-Carracedo, Ana, Schulze, Steve, Kann, D. Alexander, Kulkarni, S. R., Sollerman, Jesper, Tanvir, Nial, Rest, Armin, Izzo, Luca, Somalwar, Jean J., Kaplan, David L., Ahumada, Tomas, Anupama, G. C., Auchettl, Katie, Barway, Sudhanshu, Bellm, Eric C., Bhalerao, Varun, Bloom, Joshua S., Bremer, Michael, Bulla, Mattia, Burns, Eric, Campana, Sergio, Chandra, Poonam, Charalampopoulos, Panos, Cooke, Jeff, D'Elia, Valerio, Das, Kaustav Kashyap, Dobie, Dougal, Fernández, José Feliciano Agüí, Freeburn, James, Fremling, Cristoffer, Gezari, Suvi, Goode, Simon, Graham, Matthew, Hammerstein, Erica, Karambelkar, Viraj R., Kilpatrick, Charles D., Kool, Erik C., Krips, Melanie, Laher, Russ R., Leloudas, Giorgos, Levan, Andrew, Lundquist, Michael J., Mahabal, Ashish A., Medford, Michael S., Miller, M. Coleman, Möller, Anais, Mooley, Kunal, Nayana, A. J., Nir, Guy, Pang, Peter T. H., Paraskeva, Emmy, Perley, Richard A., Petitpas, Glen, Pursiainen, Miika, Ravi, Vikram, Ridden-Harper, Ryan, Riddle, Reed, Rigault, Mickael, Rodriguez, Antonio C., Rusholme, Ben, Sharma, Yashvi, Smith, I. A., Stein, Robert D., Thöne, Christina, Tohuvavohu, Aaron, Valdes, Frank, van Roestel, Jan, Vergani, Susanna D., Wang, Qinan, Zhang, Jielai
Tidal disruption events (TDEs) are bursts of electromagnetic energy released when supermassive black holes (SMBHs) at the centers of galaxies violently disrupt a star that passes too close. TDEs provide a new window to study accretion onto SMBHs; in
Externí odkaz:
http://arxiv.org/abs/2211.16530
Autor:
Vacca, Valentina, Govoni, Federica, Murgia, Matteo, Perley, Richard A., Feretti, Luigina, Giovannini, Gabriele, Carretti, Ettore, Gastaldello, Fabio, Cova, Filippo, Marchegiani, Paolo, Battistelli, Elia, Boschin, Walter, Ensslin, Torsten A., Girardi, Marisa, Loi, Francesca, Radiconi, Federico
Large-scale magnetic fields reveal themselves through diffuse synchrotron sources observed in galaxy clusters such as radio halos. Total intensity filaments of these sources have been observed in polarization as well, but only in three radio halos ou
Externí odkaz:
http://arxiv.org/abs/2206.03402
Autor:
Vacca, Valentina, Shimwell, Timothy, Perley, Richard A., Govoni, Federica, Murgia, Matteo, Feretti, Luigina, Giovannini, Gabriele, Loi, Francesca, Carretti, Ettore, Cova, Filippo, Gastaldello, Fabio, Girardi, Marisa, Ensslin, Torsten, Akamatsu, Hiroki, Bonafede, Annalisa, Bonnassieux, Etienne, Boschin, Walter, Botteon, Andrea, Brunetti, Gianfranco, Brueggen, Marcus, Finoguenov, Alexis, Hoang, Duy, Iacobelli, Marco, Orru', Emanuela, Paladino, Rosita, Roettgering, Huub, van Weeren, Reinout, Vitello, Fabio, Wittor, Denis
The galaxy cluster Abell 523 (A523) hosts an extended diffuse synchrotron source historically classified as a radio halo. Its radio power at 1.4 GHz makes it one of the most significant outliers in the scaling relations between observables derived fr
Externí odkaz:
http://arxiv.org/abs/2201.12207
Autor:
Arras, Philipp, Bester, Hertzog L., Perley, Richard A., Leike, Reimar, Smirnov, Oleg, Westermann, Rüdiger, Enßlin, Torsten A.
Publikováno v:
A&A 646, A84 (2021)
CLEAN, the commonly employed imaging algorithm in radio interferometry, suffers from a number of shortcomings: in its basic version it does not have the concept of diffuse flux, and the common practice of convolving the CLEAN components with the CLEA
Externí odkaz:
http://arxiv.org/abs/2008.11435
Autor:
Snios, Bradford, Johnson, Amalya C., Nulsen, Paul E. J., Kraft, Ralph P., de Vries, Martijn, Perley, Richard A., Sebokolodi, Lerato, Wise, Michael W.
The powerful FR II radio galaxy Cygnus A exhibits primary and secondary hotspots in each lobe. A 2 Msec Chandra X-ray image of Cygnus A has revealed an approximately circular hole, with a radius of 3.9 kpc, centered on the primary hotspot in the east
Externí odkaz:
http://arxiv.org/abs/2002.02978