Results 71 to 80 of about 23,272 (235)

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope [PDF]

Astrophysical Journal, 2019
The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains objects located at high Galactic latitudes ( ).
M. Ajello, R. Angioni, M. Axelsson, J. Ballet, G. Barbiellini, D. Bastieri, J. Becerra González, R. Bellazzini, E. Bissaldi, E. Bloom, R. Bonino, E. Bottacini, P. Bruel, S. Buson, F. Cafardo, R. Cameron, E. Cavazzuti, S. Chen, C. C. Cheung, S. Ciprini, D. Costantin, S. Cutini, F. D’Ammando, P. De la Torre Luque, R. de Menezes, F. de Palma, A. Desai, N. Di Lalla, L. Di Venere, A. Domínguez, F. Dirirsa, E. Ferrara, J. Finke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, S. Garrappa, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, D. Green, I. Grenier, S. Guiriec, S. Harita, E. Hays, D. Horan, R. Itoh, G. Jóhannesson, M. Kovac’evic’, F. Krauß, M. Kreter, M. Kuss, S. Larsson, C. Leto, J. Li, I. Liodakis, F. Longo, F. Loparco, B. Lott, M. Lovellette, P. Lubrano, G. Madejski, S. Maldera, A. Manfreda, G. Martí-Devesa, F. Massaro, M. Mazziotta, I. Mereu, M. Meyer, G. Migliori, N. Mirabal, T. Mizuno, M. Monzani, A. Morselli, I. Moskalenko, M. Negro, R. Nemmen, É. Nuss, L. Ojha, R. Ojha, N. Omodei, M. Orienti, E. Orlando, J. Ormes, V. Paliya, Z. Pei, H. Peña-Herazo, M. Persic, M. Pesce-Rollins, L. Petrov, F. Piron, Hoifung Poon, G. Principe, S. Rainò, R. Rando, Babita Rani, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, F. Schinzel, D. Serini, C. Sgro’, E. Siskind, G. Spandre, P. Spinelli, D. Suson, Y. Tachibana, D. Thompson, D. Torres, E. Torresi, E. Troja, J. Valverde, P. van Zyl, M. Yassine   +117 more
semanticscholar   +1 more source

Effect of Background Magnetic Field on Ion Weibel Instability With High‐Intensity Short‐Pulse Lasers

Contributions to Plasma Physics, EarlyView.
ABSTRACT The effect of finite background magnetic field on magnetic field amplification by Weibel instability using high‐intensity short‐pulse lasers is investigated. We consider Weibel instability for counter‐streaming sub‐relativistic plasma flows generated by shooting pure carbon targets with short‐pulse lasers.
Taiki Jikei, Takanobu Amano, Yosuke Matsumoto, Yasuhiro Kuramitsu   +3 more
wiley   +1 more source

The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei

The Astrophysical Journal
It has previously been found that the galaxy cluster environment can affect the fueling and evolution of active galactic nuclei (AGN). This work examines the effect of the merging cluster environment on the properties of radio AGN by comparing the radio ...
Mary Rickel, Emily Moravec, Yjan A. Gordon, Martin J. Hardcastle, Jonathon C. S. Pierce, Lawrence E. Bilton, Ian D. Roberts   +6 more
doaj   +1 more source

Radio Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications [PDF]

The Astrophysical Journal, 2007
We investigate how the total radio luminosity of AGN-powered radio sources depends on their accretion luminosity and the central black hole mass. Our studies cover about seven orders of magnitude in accretion luminosity and the full range of AGN black hole masses. We find that AGNs form two distinct and well separated sequences on the radio-loudness --
Ł. Stawarz, Ł. Stawarz, Ł. Stawarz, Jean-Pierre Lasota, Jean-Pierre Lasota, Marek Sikora, Marek Sikora   +6 more
openaire   +5 more sources

The Radio Structure of the γ-Ray Narrow-line Seyfert 1 Galaxy SDSS J211852.96-073227.5

The Astrophysical Journal, 2023
The γ -ray narrow-line Seyfert 1 (NLS1) galaxies can be considered to be the third class of γ -ray active galactic nuclei possessing relativistic jets. In this paper, we present multi-band high-resolution Very Long Baseline Array (VLBA) images of the γ ...
Xi Shao, Minfeng Gu, Yongjun Chen, Hui Yang, Su Yao, Weimin Yuan, Zhiqiang Shen   +6 more
doaj   +1 more source

A TWO-PARAMETER MODEL FOR THE INFRARED/SUBMILLIMETER/RADIO SPECTRAL ENERGY DISTRIBUTIONS OF GALAXIES AND ACTIVE GALACTIC NUCLEI [PDF]

, 2014
A two-parameter semi-empirical model is presented for the spectral energy distributions of galaxies with contributions to their infrared–submillimeter–radio emission from both star formation and accretion disk-powered activity.
D. Dale, G. Helou, G. Magdis, L. Armus, T. Díaz-Santos, Yong Shi   +5 more
semanticscholar   +1 more source

Relativistic Jets from Active Galactic Nuclei [PDF]

Annual Review of Astronomy and Astrophysics, 2018
The nuclei of most normal galaxies contain supermassive black holes, which can accrete gas through a disk and become active. These active galactic nuclei (AGNs) can form jets that are observed on scales from astronomical units to megaparsecs and from ...
R. Blandford, D. Meier, A. Readhead
semanticscholar   +1 more source

Gamma-ray observations of low-luminosity active galactic nuclei [PDF]

, 2020
The majority of the activity around nearby (z ~ 0) supermassive black holes is found in low-luminosity active galactic nuclei (LLAGN), the most of them being classified as low ionization nuclear emission regions.
R. de Menezes, R. Nemmen, J. Finke, Ivan Almeida, B. Rani   +4 more
semanticscholar   +1 more source

ATAC‐seq in Emerging Model Organisms: Challenges and Strategies

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.
Principle of ATAC‐seq (left), overview of arthropod species with published ATAC‐seq data (middle), summary of experimental design (right). ABSTRACT The Assay for Transposase‐Accessible Chromatin with sequencing (ATAC‐seq) is a versatile and widely utilized method for identifying potential regulatory regions, such as promoters and enhancers, within a ...
Duğçar Ebrar Erdoğan, Shadi Karimifard, Mozhgan Khodadadi, Liucong Ling, Luisa Linke, Ana Catalán, Vincent Doublet, Amanda Glaser‐Schmitt, Oliver Niehuis, Katja Nowick, Antonella Soro, Natascha Turetzek, Barbara Feldmeyer, Nico Posnien   +13 more
wiley   +1 more source

Optical Spectra of Radio-Loud and Radio-Quiet Active Galactic Nuclei [PDF]

Symposium - International Astronomical Union, 1982
Many radio galaxies have strong emission lines in their optical spectra. The fraction with such lines is much larger than in “normal” galaxies. Radio galaxies generally also have very bright nuclei; thus those with strong emission lines are similar in both respects to Seyfert galaxies.
openaire   +2 more sources