Results 21 to 30 of about 1,091,526 (300)

Radio loudness and classification for radio sources

Publications of the Astronomical Society of Japan, 2021
Abstract The extragalactic radio sources are divided into two subclasses (radio-loud and radio-quiet sources) in the literature using radio loudness (R), which is defined as the ratio of radio emission to optical emission, but the boundary R-value separating the two classes is different in various sources.
Lixia Zhang, Junhui Fan, Jingtian Zhu
openaire   +1 more source

A Comprehensive Observational Study of the FRB 121102 Persistent Radio Source

The Astrophysical Journal, 2023
FRB 121102 is the first fast radio burst to be spatially associated with a persistent radio source (QRS 121102), the nature of which remains unknown. We constrain the physical size of QRS 121102 by measuring its flux-density variability with the VLA from
Ge Chen, Vikram Ravi, Gregg W. Hallinan
doaj   +1 more source

An Injection System for the CHIME/FRB Experiment

The Astronomical Journal, 2023
Dedicated surveys searching for fast radio bursts (FRBs) are subject to selection effects that bias the observed population of events. Software injection systems are one method of correcting for these biases by injecting a mock population of synthetic ...
Marcus Merryfield, Shriharsh P. Tendulkar, Kaitlyn Shin, Bridget Andersen, Alexander Josephy, Deborah Good, Fengqiu Adam Dong, Kiyoshi W. Masui, Dustin Lang, Moritz Münchmeyer, Charanjot Brar, Tomas Cassanelli, Matt Dobbs, Emmanuel Fonseca, Victoria M. Kaspi, Juan Mena-Parra, Ziggy Pleunis, Masoud Rafiei-Ravandi, Ketan R. Sand, Paul Scholz, Kendrick Smith, Ingrid H. Stairs   +21 more
doaj   +1 more source

COMPACT RADIO SOURCES IN M17 [PDF]

The Astrophysical Journal, 2012
24 pages, 7 figures, To appear in The Astrophysical ...
Rodríguez Luis, F., González, Ricardo F., Montes, Gabriela, Asiri, Hassan M., Raga, Alejandro C., Cantó, Jorge   +5 more
openaire   +3 more sources

Fermi Large Area Telescope Observations of Misaligned AGN [PDF]

, 2010
Analysis is presented on 15 months of data taken with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope for 11 non-blazar AGNs, including 7 FRI radio galaxies and 4 FRII radio sources consisting of 2 FRII radio galaxies and 2 steep ...
A. A. Abdo, A. Bouvier, A. Brez, A. Cannon, A. Celotti, A. Chekhtman, A. de Angelis, A. Makeev, A. Morselli, A. Okumura, A. P. Waite, A. Reimer, A. S. Johnson, A. Sander, A. Tramacere, A. W. Borgland, A. W. Chen, Abdo, Abdo, Abdo, Abdo, Abdo, Abdo, Aloy, Attridge, Atwood, B. Berenji, B. L. Winer, B. Lott, Bennett, Burgess, Burgess, Böttcher, Böttcher, C. C. Cheung, C. Cecchi, C. D. Dermer, C. Favuzzi, C. Monte, C. Sgrò, Cheung, Chiaberge, Chiaberge, Chiaberge, D. Bastieri, D. F. Torres, D. Gasparrini, D. Hadasch, D. Horan, D. J. Suson, D. J. Thompson, D. Paneque, D. Parent, D. S. Davis, D. Sanchez, Dermer, E. Bonamente, E. C. Ferrara, E. Cavazzuti, E. Charles, E. D. Bloom, E. do Couto e Silva, E. Hays, E. J. Siskind, E. Nuss, E. Orlando, E. Torresi, F. de Palma, F. Gargano, F. Giordano, F. Longo, F. Loparco, F. Piron, F. W. Stecker, Fanaroff, Finke, G. A. Caliandro, G. Barbiellini, G. Godfrey, G. Jóhannesson, G. M. Madejski, G. Malaguti, G. Migliori, G. Spandre, G. Tosti, Georganopoulos, Giroletti, Grandi, H. F.-W. Sadrozinski, H. Katagiri, H. Takahashi, Hardcastle, Harris, Harris, Hartman, Hartman, I. A. Grenier, I. Nestoras, I. V. Moskalenko, J. B. Thayer, J. Ballet, J. Bregeon, J. Chiang, J. Cohen-Tanugi, J. Conrad, J. D. Scargle, J. E. Grove, J. E. McEnery, J. F. Ormes, J. G. Thayer, J. H. Panetta, J. Kataoka, J. Knödlseder, J. Lande, J. M. Casandjian, J. P. Norris, J. Vandenbroucke, Jackson, K. Bechtol, K. S. Wood, Kataoka, Komatsu, L. Baldini, L. C. Reyes, L. Guillemot, L. Latronico, Laing, Laing, M. Ackermann, M. Ajello, M. Brigida, M. E. Monzani, M. Frailis, M. Giroletti, M. Hayashida, M. Kuss, M. Lemoine-Goumard, M. Llena Garde, M. N. Lovellette, M. N. Mazziotta, M. Naumann-Godo, M. Pepe, M. Persic, M. Pesce-Rollins, M. Razzano, M. Roth, M. S. Jackson, M. S. Strickman, M. Villata, M. Ziegler, Marshall, Mattox, Morganti, Mukherjee, N. Gehrels, N. Giglietto, N. Omodei, N. Vilchez, Neronov, O. Reimer, P. A. Caraveo, P. Bruel, P. D. Smith, P. F. Michelson, P. Fortin, P. Fusco, P. Giommi, P. Grandi, P. L. Nolan, P. Lubrano, P. S. Drell, P. Spinelli, P. Wang, R. A. Cameron, R. Bellazzini, R. Buehler, R. Claus, R. D. Blandford, R. Dubois, R. E. Hughes, R. Rando, S. Buson, S. Carrigan, S. Ciprini, S. Colafrancesco, S. Germani, S. Guiriec, S. J. Fegan, S. Murgia, S. Rainò, S. Razzaque, S.-H. Lee, Sowards-Emmerd, Stawarz, Stawarz, Stawarz, Swain, T. A. Porter, T. Glanzman, T. H. Burnett, T. J. Brandt, T. Kamae, T. L. Usher, T. Mizuno, T. Ohsugi, T. Tanaka, T. Ylinen, V. Pelassa, V. Vasileiou, V. Vitale, W. McConville, W. Mitthumsiri, W. N. Johnson, Wilkinson, Y. Fukazawa, Y. Uchiyama, Z. Yang, Ö. Çelik, Ł. Stawarz   +218 more
core   +4 more sources

Inferring the Energy and Distance Distributions of Fast Radio Bursts Using the First CHIME/FRB Catalog

The Astrophysical Journal, 2023
Fast radio bursts (FRBs) are brief, energetic, typically extragalactic flashes of radio emission whose progenitors are largely unknown. Although studying the FRB population is essential for understanding how these astrophysical phenomena occur, such ...
Kaitlyn Shin, Kiyoshi W. Masui, Mohit Bhardwaj, Tomas Cassanelli, Pragya Chawla, Matt Dobbs, Fengqiu Adam Dong, Emmanuel Fonseca, B. M. Gaensler, Antonio Herrera-Martín, Jane Kaczmarek, Victoria Kaspi, Calvin Leung, Marcus Merryfield, Daniele Michilli, Moritz Münchmeyer, Aaron B. Pearlman, Masoud Rafiei-Ravandi, Kendrick Smith, Ingrid Stairs, Shriharsh P. Tendulkar   +20 more
doaj   +1 more source

Radio Observations of the Hubble Deep Field South Region III: The 2.5, 5.2 and 8.7 GHz Catalogues and Radio Source Properties [PDF]

, 2006
Deep radio observations of a wide region centred on the Hubble Deep Field South have been performed, providing one of the most sensitive set of radio observations acquired on the Australia Telescope Compact Array to date.
Carole A. Jackson, Fanaroff B. L., Fanti C., Hine R. G., Kaiser C. R., Longair M. S., Minh T. Huynh, Murgia M., Ray P. Norris, Reynolds C. S., Roettgering H. J. A., Rowan-Robinson M., Stanghellini C., Subrahmanyan R., Wall J. V.   +14 more
core   +2 more sources

Radio variability properties for radio sources [PDF]

Astronomy & Astrophysics, 2006
In this paper, we used the database of the university of Michigan Radio Astronomy Observatory (UMRAO) at three (4.8 GHz, 8.0 GHZ, and 14.5 GHz) radio frequency to analyze the radio light curves by the power spectral analysis method in search of possible periodicity.
J. H. Fan, Y. Liu, Y. H. Yuan, T. X. Hua, H. G. Wang, Y. X. Wang, J. H. Yang, A. C. Gupta, J. Li, J. L. Zhou, S. X. Xu, J. L. Chen   +11 more
openaire   +2 more sources

Temporal and Spectral Properties of the Persistent Radio Source Associated with FRB 20190520B with the VLA

The Astrophysical Journal, 2023
Among more than 800 known fast radio bursts (FRBs), only two, namely FRB 20121102A and FRB 20190520B, are confirmed to be associated with persistent radio sources (PRSs).
Xian Zhang, Wenfei Yu, Casey Law, Di Li, Shami Chatterjee, Paul Demorest, Zhen Yan, Chenhui Niu, Kshitij Aggarwal, Reshma Anna-Thomas, Sarah Burke-Spolaor, Liam Connor, Chao-Wei Tsai, Weiwei Zhu, Gan Luo   +14 more
doaj   +1 more source

Extended Radio Emission in the Perhipheral Regions of the Shapley Concentration Core

Galaxies, 2017
The Shapley Concentration (SC) is a galaxy supercluster (few tens of degrees) in the Local Universe (<z>∼0.048) which is currently undergoing cluster mergers and group accretion.
Tiziana Venturi, Sandro Bardelli, Daniele Dallacasa, Gabriella Di Gennaro, Fabio Gastaldello, Simona Giacintucci, Mariachiara Rossetti   +6 more
doaj   +1 more source