Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Annalisa Celotti"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 522:5517-5528
We present a new algorithm for the identification and physical characterization of current sheets and reconnection sites in 2D and 3D large-scale relativistic magnetohydrodynamic numerical simulations. This has been implemented in the pluto code and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::697d580e30287938d3a32954a6243144
https://doi.org/10.1093/mnras/stad1348
https://doi.org/10.1093/mnras/stad1348
Publikováno v:
Astronomy & Astrophysics, 650, 1-8
Giant Radio Galaxies (GRGs) are the largest single structures in the Universe. Exhibiting extended radio morphology, their projected sizes range from 0.7 Mpc up to 4.9 Mpc. LOFAR has opened a new window on the discovery and investigation of GRGs and,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8eeb7fe47c2fb8afc325f265c7185a1
https://ui.adsabs.harvard.edu/abs/2021A&A...650A..51M
https://ui.adsabs.harvard.edu/abs/2021A&A...650A..51M
Autor:
S. Ascenzi, Gabriele Ghisellini, Om Sharan Salafia, Lara Nava, M. E. Ravasio, Gor Oganesyan, Giancarlo Ghirlanda, Annalisa Celotti, M. Ronchi
We discuss the new surprising observational results that indicate quite convincingly that the prompt emission of gamma-ray bursts (GRBs) is due to synchrotron radiation produced by a particle distribution that has a low-energy cut-off. The evidence o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd3e600278bcf97876f0d82c6dcedd2c
http://hdl.handle.net/20.500.11767/117104
http://hdl.handle.net/20.500.11767/117104
Publikováno v:
Astronomy & Astrophysics. 658:A68
Mass and spin are two fundamental properties of astrophysical black holes. While some established, indirect methods are adopted to measure both these properties of active galactic nuclei (AGN) when viewed relatively face-on, very few suggested method
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09ab322d1886c3688d8b3197c7c712ab
https://doi.org/10.1051/0004-6361/202142451
https://doi.org/10.1051/0004-6361/202142451
Publikováno v:
Astronomy & Astrophysics. 656:A96
We study the ratio $R$ between the luminosity of the torus and that of the accretion disk, inferred from the relativistic model KERRBB for a sample of approximately 2000 luminosity-selected radio-quiet Type I active galactic nuclei from the Sloan Dig
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c47b71bf94d14250ab445183c36d1bca
https://doi.org/10.1051/0004-6361/202141602
https://doi.org/10.1051/0004-6361/202141602
Autor:
E. S. Kammoun, Gabriele Ghisellini, Annalisa Celotti, Emanuele Nardini, E. Behar, Guido Risaliti
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters. 473:L89-L93
Blazars are often characterized by a spectral break at soft X-rays, whose origin is still debated. While most sources show a flattening, some exhibit a blackbody-like soft excess with temperatures of the order of $\sim$0.1 keV, similar to low-luminos
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69ed1fafe133174b51a17d44d69b2e92
https://doi.org/10.1093/mnrasl/slx164
https://doi.org/10.1093/mnrasl/slx164
Publikováno v:
Astronomy & Astrophysics
Information on the spectral shape of prompt emission in gamma-ray bursts (GRB) is mostly available only at energies $\gtrsim10$ keV, where the main instruments for GRB detection are sensitive. The origin of this emission is still very uncertain becau
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::230c0df3190c86b69eb72cad6751a681
http://hdl.handle.net/10281/268112
http://hdl.handle.net/10281/268112
Publikováno v:
Astronomy & Astrophysics. 640:A39
We selected a sample of 28 Type 1 AGNs for which a black hole mass has been inferred using the reverberation mapping technique and single epoch scaling relations. All 28 sources show clear evidence of the "Big Blue Bump" in the optical-UV band whose
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e6610a6c7c043897b9ffff1ba6b362d
https://doi.org/10.1051/0004-6361/201936218
https://doi.org/10.1051/0004-6361/201936218
Active galactic nucleus (AGN) feedback, driven by radiation pressure on dust, is an important mechanism for efficiently coupling the accreting black hole to the surrounding environment. Recent observations confirm that X-ray selected AGN samples resp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c0cb9ce88fc1d2d018ae33bc6eb4156
https://doi.org/10.5167/uzh-160973
https://doi.org/10.5167/uzh-160973
Autor:
Francesca Perrotta, Giuseppe Puglisi, Vincenzo Galluzzi, J. González-Nuevo, Laura Bonavera, Marcella Massardi, Luigi Danese, Carlo Baccigalupi, Annalisa Celotti, Andrea Lapi
Publikováno v:
The Astrophysical Journal
We combine the latest data sets obtained with different surveys to study the frequency dependence of polarized emission coming from extragalactic radio sources (ERS). We consider data over a very wide frequency range starting from 1.4 GHz up to 217 G
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db14f51e37ed1761cb8f4e25b456fe7e