Results 1 to 10 of about 162 (103)
Fanaroff–Riley classification of radio galaxies using group-equivariant convolutional neural networks [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT Weight sharing in convolutional neural networks (CNNs) ensures that their feature maps will be translation-equivariant. However, although conventional convolutions are equivariant to translation, they are not equivariant to other isometries of the input image data, such as rotation and reflection.
Anna M. M. Scaife, Fiona Porter
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Fanaroff–Riley dichotomy of radio galaxies and the Malmquist bias [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We examine the possibility that a claimed dependence of the FR 1/2 break value in radio luminosity on the absolute magnitude of the optical host galaxy could be due to the Malmquist bias, where a redshift-luminosity correlation appears in a flux-limited sample because of an observational selection effect.
Ashok K. Singal, K. Rajpurohit
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UNDERSTANDING THE FANAROFF–RILEY RADIO GALAXY CLASSIFICATION [PDF]
The Astronomical Journal, 2012 The simple, yet profoundly far-reaching classification scheme based on extended radio morphologies of radio galaxies, the Fanaroff-Riley classification has been a cornerstone in our understanding of radio galaxies. Over the decades since the recognition that there are two basic types of radio galaxy morphologies there have been several findings in ...
L. Saripalli
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Quintessence, Cosmology, and Fanaroff-Riley Type II[CLC]b[/CLC] Radio Galaxies [PDF]
The Astronomical Journal, 2002 Fanaroff-Riley type IIb (FR IIb) radio galaxies provide a modified standard yardstick that allows constraints to be placed on global cosmological parameters. A sample of 20 FR IIb radio galaxies with redshifts between 0 and 2 are compared with the parent population of 70 radio galaxies to determine the coordinate distance to each source. The coordinate-
Ruth A. Daly, Erick J. Guerra
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Relativistic Jets and the Fanaroff-Riley Classification of Radio Galaxies [PDF]
The Astrophysical Journal Supplement Series, 1995 Recently, Owen(1993) and Owen and Ledlow (1994) have shown that the dividing line between Fanaroff-Riley class~I and class~II Radio Sources is very sharp when the sources are represented as points in the radio-optical luminosity plane. It is shown that if one accepts the propositions that the sources in the vicinity of this dividing line are ...
Geoffrey V. Bicknell
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Fanaroff-Riley II Radio Galaxies and Quasars: The Depolarization Test [PDF]
The Astronomical Journal, 2001 Two statistically complete samples of 13 Fanaroff-Riley type II (FR II) radio galaxies (RGs) and 13 FR II quasars (QSRs) are compared in terms of their polarization properties. Previously, we have reported that the jet detection rate is consistent with the prediction of the unified models, with more jets detected in QSRs than in RGs.
Ilias Fernini
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Parsec-scale properties of eight Fanaroff–Riley type 0 radio galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT We report the high-resolution radio observations of eight Fanaroff–Riley type 0 radio galaxies (FR 0s), selected from the published FR 0 sample. These observations were carried out with the Very Long Baseline Array (VLBA) and European VLBI Network (EVN) at frequencies of 5 and 8 GHz with a highest resolution of ∼0.6 milliarcsec.
Xiaopeng Cheng +4 more
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Dependence of Fanaroff–Riley break of radio galaxies on luminosity and redshift [PDF]
Astrophysics and Space Science, 2014 12 pages, 5 figures, 3 ...
Ashok K. Singal, Kamlesh Rajpurohit
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Radio Galaxy Zoo: morphological classification by Fanaroff–Riley designation using self-supervised pre-training [PDF]
Monthly Notices of the Royal Astronomical SocietyAbstract In this study, we examine over 14,000 radio galaxies finely selected from Radio Galaxy Zoo (RGZ) project and provide classifications for approximately 5,900 FRIs and 8,100 FRIIs. We present an analysis of these predicted radio galaxy morphologies for the RGZ catalogue, classified using a pre-trained radio galaxy foundation ...
Nutthawara Buatthaisong +7 more
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Parsec-scale Radio Structure of 14 Fanaroff–Riley Type 0 Radio Galaxies
The Astrophysical Journal, 2018 Abstract Recently a population of compact radio galaxies were classified as Fanaroff–Riley type 0 radio galaxies (FR 0s). The physical nature of FR 0s and the connection with the classical FR I and II galaxies are not currently well understood. Here, we report the radio properties of 14 FR 0s on parsec (pc) scales derived from their very
Xiaopeng Cheng, Tao An
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