High-energy Gamma Rays from Magnetically Arrested Disks in Nearby Radio Galaxies
TL;DR: In this paper , the magnetically arrested disks (MADs) around central black holes are proposed as a possible scenario for the origin of the GeV gamma rays from nearby radio galaxies.
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Abstract: The origins of the GeV gamma rays from nearby radio galaxies are unknown. Hadronic emission from magnetically arrested disks (MADs) around central black holes is proposed as a possible scenario. Particles are accelerated in a MAD by magnetic reconnection and stochastic turbulence acceleration. We pick out the 15 brightest radio galaxies in the GeV band from The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope, Data Release 2 and apply the MAD model. We find that we can explain the data in the GeV bands by the MAD model if the accretion rate is lower than 0.1% of the Eddington rate. For a higher accretion rate, GeV gamma rays are absorbed by two-photon interaction due to copious low-energy photons. If we assume another proposed prescription of the electron-heating rate by magnetic reconnection, the MAD model fails to reproduce the GeV data for the majority of our sample. This indicates that the electron-heating rate is crucial. We also apply the MAD model to Sagittarius A* (Sgr A*) and find that GeV gamma rays observed at the Galactic center do not come from the MAD of Sgr A*. We estimate the cosmic ray (CR) intensity from Sgr A*, but it is too low to explain the high-energy CR intensity on Earth.
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Citations
Magnetic Reconnection in Black Hole Magnetospheres: Lepton Loading into Jets, Superluminal Radio Blobs, and Multiwavelength Flares
TL;DR: In this paper , it was shown that superluminal radio blobs around Sgr A* can emit broadband photons from optical to multi-MeV bands, which will be detectable by future X-ray satellites.
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One-dimensional General Relativistic Particle-in-cell Simulations of Stellar-mass Black Hole Magnetospheres: A Semianalytic Model of Gamma-Rays from Gaps
Koki Kin,Shota Kisaka,Kenji Toma,Shigeo S. Kimura,Amir Levinson +4 more
TL;DR: One-dimensional general relativistic particle-in-cell simulations of stellar-mass black hole magnetospheres find that spark gaps emerge and particles are efficiently accelerated, leading to gamma-ray emission. A semianalytic model reproduces the maximum electron energies and peak gamma-ray luminosities of the simulation results.
1
References
The Generation of Nonthermal Particles in the Relativistic Magnetic Reconnection of Pair Plasmas
Seiji Zenitani,Masahiro Hoshino +1 more
TL;DR: In this paper, the acceleration in the magnetic reconnection of electron-positron plasmas is studied by using a particle-in-cell simulation, and it is found that a significantly large number of nonthermal particles are generated by the inductive electric fields around an X-type neutral line when the reconnection outflow velocity, which is known to be an Alfv\'{e}n velocity, is on the order of the speed of light.
333
First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
TL;DR: In this article , the authors compare resolved EHT data at 230 GHz and unresolved non-EHT observations from radio to X-ray wavelengths to predictions from a library of models based on time-dependent general relativistic magnetohydrodynamics simulations, including aligned, tilted, and stellar-wind-fed simulations; radiative transfer is performed assuming both thermal and nonthermal electron distribution functions.
316
The Generation of Nonthermal Particles in the Relativistic Magnetic Reconnection of Pair Plasmas
Seiji Zenitani,Masahiro Hoshino +1 more
TL;DR: In this paper, the acceleration in the magnetic reconnection of electron-positron plasmas is studied by using a particle-in-cell simulation, and it is found that a significantly large number of nonthermal particles are generated by the inductive electric fields around an X-type neutral line when the reconnection outflow velocity, which is known to be an Alfven velocity, is on the order of the speed of light.
302
The Accretion of Matter by a Collapsing Star in the Presence of a Magnetic Field
TL;DR: In this article, the exact nonstationary solution for the variation of the magnetic field in the Schwarzschild metric with a given spherically symmetric flow is obtained, on the assumption of equipartition between the magnetic and kinetic energies of a falling gas, in the relativistic case, estimates of the stationary field and the intensity of synchrotron radiation are presented.
301
Fermi discovery of gamma-ray emission from ngc 1275
A. A. Abdo,A. A. Abdo,Markus Ackermann,Marco Ajello,Katsuaki Asano,Luca Baldini,Jean Ballet,Guido Barbiellini,Guido Barbiellini,Denis Bastieri,Denis Bastieri,B. M. Baughman,Keith Bechtol,Ronaldo Bellazzini,Roger Blandford,Elliott D. Bloom,Emanuele Bonamente,Emanuele Bonamente,A. W. Borgland,J. Bregeon,Alessandro Brez,M. Brigida,M. Brigida,P. Bruel,T. H. Burnett,G. A. Caliandro,G. A. Caliandro,R. A. Cameron,P. A. Caraveo,J. M. Casandjian,E. Cavazzuti,Claudia Cecchi,Claudia Cecchi,Annalisa Celotti,A. Chekhtman,A. Chekhtman,C. C. Cheung,James Chiang,Stefano Ciprini,Stefano Ciprini,R. Claus,Johann Cohen-Tanugi,S. Colafrancesco,L. R. Cominsky,Jan Conrad,L. Costamante,Charles D. Dermer,A. De Angelis,F. de Palma,F. de Palma,Seth Digel,Davide Donato,E. Do Couto E Silva,Persis S. Drell,R. Dubois,D. Dumora,D. Dumora,Christian Farnier,C. Favuzzi,C. Favuzzi,Justin D. Finke,Justin D. Finke,W. B. Focke,M. Frailis,Yasushi Fukazawa,Stefan Funk,P. Fusco,P. Fusco,F. Gargano,Markos Georganopoulos,S. Germani,S. Germani,B. Giebels,Nicola Giglietto,Nicola Giglietto,Francesco Giordano,Francesco Giordano,T. Glanzman,I. A. Grenier,M.-H. Grondin,M.-H. Grondin,J. E. Grove,L. Guillemot,L. Guillemot,Sylvain Guiriec,Y. Hanabata,Alice K. Harding,R. C. Hartman,M. Hayashida,E. Hays,R. E. Hughes,Gudlaugur Johannesson,A. S. Johnson,R. P. Johnson,W. N. Johnson,Matthias Kadler,T. Kamae,Y. Kanai,Hideaki Katagiri,Jun Kataoka,N. Kawai,Matthew Kerr,Jürgen Knödlseder,F. Kuehn,M. Kuss,Luca Latronico,Marianne Lemoine-Goumard,Marianne Lemoine-Goumard,Francesco Longo,Francesco Longo,F. Loparco,F. Loparco,Benoit Lott,Benoit Lott,M. N. Lovellette,P. Lubrano,P. Lubrano,G. M. Madejski,A. Makeev,A. Makeev,M. N. Mazziotta,Julie McEnery,C. Meurer,Peter F. Michelson,W. Mitthumsiri,Tsunefumi Mizuno,A. A. Moiseev,A. A. Moiseev,C. Monte,C. Monte,M. E. Monzani,A. Morselli,Igor V. Moskalenko,S. Murgia,Takeshi Nakamori,P. L. Nolan,J. P. Norris,Eric Nuss,T. Ohsugi,Nicola Omodei,E. Orlando,Jonathan F. Ormes,David Paneque,J. H. Panetta,D. Parent,D. Parent,M. Pepe,M. Pepe,Melissa Pesce-Rollins,F. Piron,T. A. Porter,S. Rainò,S. Rainò,M. Razzano,A. Reimer,Olaf Reimer,T. Reposeur,T. Reposeur,S. Ritz,S. Ritz,A. Y. Rodriguez,Roger W. Romani,Felix Ryde,Felix Ryde,Hartmut Sadrozinski,Rita M. Sambruna,David Sanchez,A. Sander,R. Sato,P. M. Saz Parkinson,Carmelo Sgrò,David A. Smith,David A. Smith,P. D. Smith,Gloria Spandre,P. Spinelli,P. Spinelli,Jean-Luc Starck,M. S. Strickman,Andrew W. Strong,D. J. Suson,Hiroyasu Tajima,Hiromitsu Takahashi,Tadayuki Takahashi,Takaaki Tanaka,G. B. Taylor,J. G. Thayer,D. J. Thompson,Diego F. Torres,Diego F. Torres,G. Tosti,G. Tosti,Yasunobu Uchiyama,T. L. Usher,N. Vilchez,V. Vitale,V. Vitale,A. P. Waite,K. S. Wood,T. Ylinen,T. Ylinen,M. Ziegler,Hugh D. Aller,Margo F. Aller,K. I. Kellermann,Yuri Y. Kovalev,Yuri Y. Kovalev,Yu. A. Kovalev,Matthew L. Lister,Alexander B. Pushkarev,Alexander B. Pushkarev +210 more
TL;DR: In this paper, the authors reported the discovery of high-energy (E>100 MeV) gamma-ray emission from NGC 1275, a giant elliptical galaxy lying at the center of the Perseus cluster of galaxies, based on observations made with the Large Area Telescope (LAT) of the Fermi Gamma ray Space Telescope.