Results 141 to 150 of about 18,989 (273)

Theoretical Study of the Effects of Magnetic Field Geometry on the High-Energy Emission of Blazars

Galaxies, 2016
The knowledge of the structure of the magnetic field inside a blazar jet, as deduced from polarization observations at radio to optical wavelengths, is closely related to the formation and propagation of relativistic jets that result from accretion onto ...
Manasvita Joshi, Alan Marscher, Markus Böttcher   +2 more
doaj   +1 more source

Neutrino oscillations and blazars [PDF]

Astroparticle Physics, 1999
14 pages, 3 postscript figures, using elsart.sty, invited talk to appear in the Proceedings of the VERITAS Workshop on TeV Astrophysics of Extragalactic Sources, eds. M. Catanese, J. Quinn, and T. Weekes (special issue of Astropart. Phys.) ** replaced by a significantly extended version **
openaire   +4 more sources

Time-Evolving SED of MKN421: A Multi-Band View and Polarimetric Signatures

Frontiers in Astronomy and Space Sciences, 2018
The most detailed temporal studies of the emission from blazars are usually done by trying to obtain a dense, simultaneous coverage of the source over a large multi-wavelength observational campaign.
Bernardo M. O. Fraga, Ulisses Barres de Almeida, Sargis Gasparyan, Paolo Giommi, Narek Sahakyan   +4 more
doaj   +1 more source

The blazar's divide and the properties of Fermi blazars

, 2009
8 pages, 8 figures. Invited talk at the meeting: Accretion and ejection in AGN: a global view (Como, June 2009). To be published in Astron. Soc. of the Pacific Conf. Series (ASPCS)
openaire   +2 more sources

Long-Term Multi-Band and Polarimetric View of Mkn 421: Motivations for an Integrated Open-Data Platform for Blazar Optical Polarimetry

Galaxies, 2017
In this work, by making use of the large software and database resources made available through online facilities such as the ASI Science Data Center (ASDC), we present a novel approach to the modelling of blazar emission whereby the multi-epoch SED for ...
Ulisses Barres de Almeida, Bernardo M. O. Fraga, Paolo Giommi, Narek Sahakyan, Sargis Gasparyan, Carlos H. Brandt   +5 more
doaj   +1 more source

Modeling Blazar Broadband Emission with a Convolutional Neural Network. I. Synchrotron Self-Compton Model

The Astrophysical Journal
Modeling the multiwavelength spectral energy distributions (SEDs) of blazars provides key insights into the underlying physical processes responsible for the emission.
D. Bégué, N. Sahakyan, H. Dereli-Bégué, P. Giommi, S. Gasparyan, M. Khachatryan, A. Casotto, A. Pe’er   +7 more
doaj   +1 more source

An Optical View of Extragalactic γ-Ray Emitters

Frontiers in Astronomy and Space Sciences, 2017
The Fermi Gamma-ray Observatory discovered about a thousand extragalactic sources emitting energy from 100 MeV to 100 GeV. The majority of these sources belong to the class of blazars characterized by a quasi-featureless optical spectrum (BL Lac Objects).
Simona Paiano, Simona Paiano, Renato Falomo, Marco Landoni, Aldo Treves, Riccardo Scarpa, Riccardo Scarpa   +6 more
doaj   +1 more source

Spectral Properties of Fermi Blazars and their Unification Schemes

Open Astronomy, 2020
We use the distributions of spectral indices (αv ) of a large homogenous sample of Fermi-detected blazars to re-investigate the relationship between flat spectrum radio quasars (FSRQs) and subclasses of BL Lac objects (BL Lacs).
Iyida Evaristus U., Odo Finbarr C., Chukwude Augustine E., Ubachukwu Augustine A.   +3 more
doaj   +1 more source

PKS J0805-0111: A Second Owens Valley Radio Observatory Blazar Showing Highly Significant Sinusoidal Radio Variability—The Tip of the Iceberg

The Astrophysical Journal
Owens Valley Radio Observatory observations of the supermassive black hole binary (SMBHB) candidate PKS 2131−021 revealed, for the first time, six likely characteristics of the phenomenology exhibited by SMBHBs in blazars, of which the most unexpected ...
P. V. de la Parra, S. Kiehlmann, P. Mróz, A. C. S. Readhead, A. Synani, M. C. Begelman, R. D. Blandford, Y. Ding, F. Harrison, I. Liodakis, W. Max-Moerbeck, V. Pavlidou, R. Reeves, M. Vallisneri, M. F. Aller, M. J. Graham, T. Hovatta, C. R. Lawrence, T. J. W. Lazio, A. A. Mahabal, B. Molina, S. O’Neill, T. J. Pearson, V. Ravi, K. Tassis, J. A. Zensus   +25 more
doaj   +1 more source

ASCAObservations of Blazars and Multiband Analysis [PDF]

, 1998
H. Kubo, Tadayuki Takahashi, G. M. Madejski, M. Tashiro, F. Makino, Susumu Inoue, Fumio Takahara   +6 more
openalex   +3 more sources