Zobrazeno 1 - 10
of 228
pro vyhledávání: '"LA FRANCA, Fabio"'
Autor:
Meyer, Eileen T., Laha, Sibasish, Shuvo, Onic I., Roychowdhury, Agniva, Green, David A., Rhodes, Lauren, Hankla, Amelia M., Philippov, Alexander, Mbarek, Rostom, laor, Ari, Begelman, Mitchell C., Sadaula, Dev R., Ghosh, Ritesh, Bruni, Gabriele, Panessa, Francesca, Guainazzi, Matteo, Behar, Ehud, Masterson, Megan, Zhang, Haocheng, Yang, Xiaolong, Gurwell, Mark A., Keating, Garrett K., Williams-Baldwin, David, Bray, Justin D., Bempong-Manful, Emmanuel K., Wrigley, Nicholas, Bianchi, Stefano, Ricci, Federica, La Franca, Fabio, Kara, Erin, Georganopoulos, Markos, Oates, Samantha, Nicholl, Matt, Pal, Main, Cenko, S. Bradley
We present multi-frequency (5-345 GHz) and multi-resolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGN). The source was first designated a CL-AGN after an opt
Externí odkaz:
http://arxiv.org/abs/2406.18061
Autor:
Ghosh, Ritesh, Laha, Sibasish, Meyer, Eileen, Roychowdhury, Agniva, Yang, Xiaolong, Pulido, J. A. Acosta, Rakshit, Suvendu, Pandey, Shivangi, Gonzalez, Josefa Becerra, Behar, Ehud, Gallo, Luigi C., Panessa, Francesca, Bianchi, Stefano, La Franca, Fabio, Scepi, Nicolas, Begelman, Mitchell C., Longinotti, Anna Lia, Lusso, Elisabeta, Oates, Samantha, Nicholl, Matt, Cenko, S. Bradley, Connor, Brendan O, Hammerstein, Erica, Jose, Jincen, Gabanyi, Krisztina Eva, Ricci, Federica, Chattopadhyay, Sabyasachi
1ES1927+654 is a nearby active galactic nucleus that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months-years. Here we report the unusual X-ray, UV, and radio variability
Externí odkaz:
http://arxiv.org/abs/2308.03602
Autor:
Saccheo, Ivano, Bongiorno, Angela, Piconcelli, Enrico, Bischetti, Manuela, Bruni, Gabriele, Cresci, Giovanni, Feruglio, Chiara, Fiore, Fabrizio, Grazian, Andrea, Luminari, Alfredo, Lusso, Elisabeta, Mainieri, Vincenzo, Maiolino, Roberto, Marconi, Alessandro, Ricci, Federica, Tombesi, Francesco, Travascio, Andrea, Vietri, Giustina, Vignali, Cristian, Zappacosta, Luca, La Franca, Fabio
Hyper-luminous Quasi-Stellar Objects (QSOs) represent the ideal laboratory to investigate Active Galactic Nuclei (AGN) feedback mechanism since their formidable energy release causes powerful winds at all scales and thus the maximum feedback is expec
Externí odkaz:
http://arxiv.org/abs/2211.07677
Autor:
Laha, Sibasish, Meyer, Eileen, Roychowdhury, Agniva, González, Josefa Becerra, Acosta-Pulido, J. A., Thapa, Aditya, Ghosh, Ritesh, Behar, Ehud, Gallo, Luigi C., Kriss, Gerard A., Panessa, Francesca, Bianchi, Stefano, La Franca, Fabio, Scepi, Nicolas, Begelman, Mitchell C., Longinotti, Anna Lia, Lusso, Elisabeta, Oates, Samantha, Nicholl, Matt, Cenko, S. Bradley
The nearby type-II AGN 1ES1927+654 went through a violent changing-look (CL) event beginning December 2017 during which the optical and UV fluxes increased by four magnitudes over a few months, and broad emission lines newly appeared in the optical/U
Externí odkaz:
http://arxiv.org/abs/2203.07446
Autor:
Panessa, Francesca, Perez-Torres, Miguel, Hernandez-Garcia, Lorena, Casella, Piergiorgio, Giroletti, Marcello, Orienti, Monica, Baldi, Ranieri D., Bassani, Loredana, Fiocchi, Maria Teresa, La Franca, Fabio, Malizia, Angela, McHardy, Ian, Nicastro, Fabrizio, Piro, Luigi, Vincentelli, Federico, Williams, David R. A., Ubertini, Pietro
The origin of radio emission in the majority of Active Galactic Nuclei (AGN) is still poorly understood. Various competing mechanisms are likely involved in the production of radio emission and precise diagnostic tools are needed to disentangle them,
Externí odkaz:
http://arxiv.org/abs/2111.12595
Publikováno v:
Il Nuovo Cimento C, YEAR 2021 - ISSUE 4-5 - JULY-OCTOBER, SIF Congress 2020
In the last years it is becoming more and more evident the importance in providing to the students, and people in general, a more realistic view on the scientific research world. In this framework many initiatives are beeing carried out to put studen
Externí odkaz:
http://arxiv.org/abs/2110.09863
Autor:
de Menezes, Raniere, Amaya-Almazán, Raul A., Marchesini, Ezequiel J., Peña-Herazo, Harold A., Massaro, Francesco, Chavushyan, Vahram, Paggi, Alessandro, Landoni, Marco, Masetti, Nicola, Ricci, Federica, D'Abrusco, Raffaele, La Franca, Fabio, Smith, Howard A., Milisavljevic, Daniel, Tosti, Gino, Jiménez-Bailón, Elena, Cheung, Teddy
Publikováno v:
Astrophysics and Space Science, Volume 365, Issue 1, article id.12
The fourth Fermi Large Area Telescope Source Catalog (4FGL) lists over 5000 gamma-ray sources with statistical significance above 4$\sigma$. About 23% of the sources listed in this catalog are unidentified/unassociated gamma-ray sources while ~26% of
Externí odkaz:
http://arxiv.org/abs/2003.12629
Autor:
Shankar, Francesco, Weinberg, David H., Marsden, Christopher, Grylls, Philip J., Bernardi, Mariangela, Yang, Guang, Moster, Benjamin, Carraro, Rosamaria, Alexander, David M., Allevato, Viola, Ananna, Tonima T., Bongiorno, Angela, Calderone, Giorgio, Civano, Francesca, Daddi, Emanuele, Delvecchio, Ivan, Duras, Federica, La Franca, Fabio, Lapi, Andrea, Lu, Youjun, Menci, Nicola, Mezcua, Mar, Ricci, Federica, Rodighiero, Giulia, Sheth, Ravi K., Suh, Hyewon, Villforth, Carolin, Zanisi, Lorenzo
The masses of supermassive black holes at the centres of local galaxies appear to be tightly correlated with the mass and velocity dispersions of their galactic hosts. However, the local Mbh-Mstar relation inferred from dynamically measured inactive
Externí odkaz:
http://arxiv.org/abs/1912.06153
Autor:
Shankar, Francesco, Allevato, Viola, Bernardi, Mariangela, Marsden, Christopher, Lapi, Andrea, Menci, Nicola, Grylls, Philip J., Krumpe, Mirko, Zanisi, Lorenzo, Ricci, Federica, La Franca, Fabio, Baldi, Ranieri D., Moreno, Jorge, Sheth, Ravi K.
A supermassive black hole has been found at the centre of nearly every galaxy observed with sufficient sensitivity. The masses of these black holes are observed to increase with either the total mass or the mean (random) velocity of the stars in thei
Externí odkaz:
http://arxiv.org/abs/1910.10175
Autor:
Bianchi, Stefano, Antonucci, Robert, Capetti, Alessandro, Chiaberge, Marco, Laor, Ari, Bassani, Loredana, Carrera, Francisco J., La Franca, Fabio, Marinucci, Andrea, Matt, Giorgio, Middei, Riccardo, Panessa, Francesca
NGC 3147 has been considered the best case of a true type 2 AGN: an unobscured AGN, based on the unabsorbed compact X-ray continuum, which lacks a broad line region (BLR). However, the very low luminosity of NGC 3147 implies a compact BLR, which prod
Externí odkaz:
http://arxiv.org/abs/1905.09627