Results 31 to 40 of about 217,086 (193)

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

Correlation of Band Bending and Ionic Losses in 1.68 eV Wide Band Gap Perovskite Solar Cells

Advanced Energy Materials, EarlyView.
Piperazinium salt treatments with different anions (chloride, iodide, tosylate, and bistriflimide) influence the energetics, carrier dynamics and long‐term stability of 1.68 eV perovskite solar cells. Chloride treatments achieve the highest efficiency (21.5%) but suffer from fast degradation due to ionic losses.
Florian Scheler, Silvia Mariotti, Daniele Mantione, Sahil Shah, Dorothee Menzel, Hans Köbler, Maxim Simmonds, Thomas W. Gries, Jona Kurpiers, Viktor Škorjanc, Jinzhao Li, Amran Al‐Ashouri, Philipp Wagner, Steven P. Harvey, Fengjiu Yang, Marin Rusu, Thomas Unold, Bernd Stannowski, Kai Zhu, Felix Lang, Dieter Neher, Eva Unger, Antonio Abate, David Mecerreyes, Martin Stolterfoht, Eike Köhnen, Lars Korte, Marko Topič, Steve Albrecht   +28 more
wiley   +1 more source

Metal halide perovskite for room temperature gamma‐ray spectrum detection

Information &Functional Materials, EarlyView.
Integrating recent advancements in metal halide perovskite (MHP) for room temperature gamma‐ray spectroscopy, we provide a comprehensive overview of the methods for growing high‐quality MHP crystals, along with fundamental insights into the structure of gamma‐ray devices and the defect characteristics of MHPs.
Zhongyi Lin, Lei Li, Yang Xu, Deren Yang, Zhenyi Ni   +4 more
wiley   +1 more source

Discovery of Giant Radio Sources from TGSS Alternative Data Release 1: Radio, Optical, and Infrared Properties

The Astrophysical Journal Supplement Series
Giant radio sources (GRSs) are the single largest astrophysical objects known in the Universe that have grown to megaparsec scales (≥0.7 Mpc). GRSs are much rarer compared with normal-sized radio galaxies.
Netai Bhukta, Souvik Manik, Sabyasachi Pal, Sushanta K. Mondal   +3 more
doaj   +1 more source

The Origin and Evolution of Giant Radio Galaxies

Frontiers in Astronomy and Space Sciences, 2022
Giant radio galaxies are arguably the least understood of jetted active galactic nuclei (AGN). We propose that radio galaxies are the product of large mergers that do not involve radio galaxies or radio quasars, such as in merging spiral galaxies, while ...
David Garofalo
doaj   +1 more source

Update on the German and Australasian Optical Ground Station Networks

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Networks of ground stations designed to transmit and receive at visible and infra‐red wavelengths through the atmosphere offer an opportunity to provide on‐demand, high‐bandwidth, secure communications with spacecraft in Earth orbit and beyond. This work describes the operation and activities of current free space optical communications (FSOC)
Nicholas J. Rattenbury, Joseph Ashby, Francis Bennet, Marcus Birch, John E. Cater, Kate Ferguson, Dirk Giggenbach, Ken Grant, Andreas Knopp, Marcus T. Knopp, Ed Kruzins, Andrew Lambert, Kerry Mudge, Catherine Qualtrough, Samuele Raffa, Jonas Rittershofer, Mikhael T. Sayat, Sascha Schediwy, Robert T. Schwarz, Matthew Sellars, Oliver Thearle, Tony Travouillon, Kevin Walker, Shane Walsh, Stephen Weddell   +24 more
wiley   +1 more source

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

Late-time Radio Brightening and Emergence of a Radio Jet in the Changing-look AGN 1ES 1927+654

The Astrophysical Journal Letters
We present multifrequency (5–345 GHz) and multiresolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic nuclei (CL-AGNs).
Eileen T. Meyer, Sibasish Laha, Onic I. Shuvo, Agniva Roychowdhury, David A. Green, Lauren Rhodes, Amelia M. Hankla, Alexander Philippov, Rostom Mbarek, Ari laor, Mitchell C. Begelman, Dev R. Sadaula, Ritesh Ghosh, Gabriele Bruni, Francesca Panessa, Matteo Guainazzi, Ehud Behar, Megan Masterson, Haocheng Zhang, Xiaolong Yang, Mark A. Gurwell, Garrett K. Keating, David Williams-Baldwin, Justin D. Bray, Emmanuel K. Bempong-Manful, Nicholas Wrigley, Stefano Bianchi, Federica Ricci, Fabio La Franca, Erin Kara, Markos Georganopoulos, Samantha Oates, Matt Nicholl, Main Pal, S. Bradley Cenko   +34 more
doaj   +1 more source

"The Contribution of Active Galactic Nuclei to the Diffuse Gamma Ray Background" [PDF]

J.Phys.G20:979-990,1994, 1994
We consider the emission of high energy to very high energy $\gamma$-rays in radio-quiet active galactic nuclei (AGN) or the central regions of radio-loud AGN. We use our results to estimate the $\gamma$-ray flux from the central regions of nearby AGN, and then to calculate the contribution to the diffuse $\gamma$-ray flux from unresolved AGN.
arxiv   +1 more source

Optical- and UV-continuum Morphologies of Compact Radio Source Hosts

The Astrophysical Journal
We present the first systematic search for UV signatures from radio source-driven active galactic nuclei (AGN) feedback in Compact Steep Spectrum (CSS) radio galaxies. Owing to their characteristic sub-galactic jets (1–20 kpc projected linear sizes), CSS
C. Duggal, C. P. O’Dea, S. A. Baum, A. Labiano, C. Tadhunter, D. M. Worrall, R. Morganti, G. R. Tremblay, D. Dicken   +8 more
doaj   +1 more source