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Optical and Radio monitoring of S5 1803+74

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R. Nesci, E. Massaro, M. Maesano, F. Montagni, S. Sclavi, T. Venturi, D. Dallacasa, F. D'Alessio

Astrophysics · Submitted 22 Apr 2002

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim The variability in the radio band is very different, and shows moderate oscillations around an average constant flux density rather than relevant flares, with a maximum amplitude of $\sim$30%, without a simultaneous correspondence between optical and radio luminosity.

how it is stated · asserted 1.00 read the record →

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arXiv IDastro-ph/0204365 (version 1)
Pith IDE4UCQ3OY, Pith's permanent record of this paper and its review
CitationD. Dallacasa, E. Massaro, F. D'Alessio, F. Montagni, M. Maesano, R. Nesci, S. Sclavi, T. Venturi. "Optical and Radio monitoring of S5 1803+74." arXiv:astro-ph/0204365 (2002). https://pith.science/paper/E4UCQ3OY
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,509 input tokens.

What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.35 · human participants 0.01 · controlled comparison 0.04 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.10 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

The optical (BVRI) and radio (8.4 GHz) light curves of S5 1803+784 on a time span of nearly 6 years are presented and discussed. The optical light curve showed an overall variation greater than 3 mag, and the largest changes occured in three strong flares. No periodicity was found in the light curve on time scales up to a year. The variability in the radio band is very different, and shows moderate oscillations around an average constant flux density rather than relevant flares, with a maximum amplitude of $\sim$30%, without a simultaneous correspondence between optical and radio luminosity. The optical spectral energy distribution was always well fitted by a power law. The spectral index shows small variations and there is indication of a positive correlation with the source luminosity. Possible explanations of the source behaviour are discussed in the framework of current models.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 The optical (BVRI) and radio (8.4 GHz) light curves of S5 1803+784 on a time span of nearly 6 years are presented and discussed. contribution 0.99 0.91 0.05 asserted 0.99
s1 The optical light curve showed an overall variation greater than 3 mag, and the largest changes occured in three strong flares. result 1.00 0.91 0.14 asserted 1.00
s2 No periodicity was found in the light curve on time scales up to a year. result 1.00 0.93 0.10 asserted 1.00
s3 The variability in the radio band is very different, and shows moderate oscillations around an average constant flux density rather than relevant flares, with a maximum amplitude of $\sim$30%, without a simultaneous correspondence between optical and radio luminosity. result 1.00 0.92 0.33 asserted 1.00
s4 The optical spectral energy distribution was always well fitted by a power law. result 1.00 0.89 0.07 asserted 1.00
s5 The spectral index shows small variations and there is indication of a positive correlation with the source luminosity. result 0.99 0.87 0.09 hedged possibility 0.89
s6 Possible explanations of the source behaviour are discussed in the framework of current models. interpretation 0.99 0.47 0.05 unclear 0.52

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.84.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

The optical (BVRI) and radio (8.4 GHz) light curves of S5 1803+784 on a time span of nearly 6 years are presented and discussed. The optical light curve showed an overall variation greater than 3 mag, and the largest changes occured in three strong flares. No periodicity was found in the light curve on time scales up to a year. The variability in the radio band is very different, and shows moderate oscillations around an average constant flux density rather than relevant flares, with a maximum amplitude of $\sim$30%, without a simultaneous correspondence between optical and radio luminosity. The optical spectral energy distribution was always well fitted by a power law. The spectral index shows small variations and there is indication of a positive correlation with the source luminosity. Possible explanations of the source behaviour are discussed in the framework of current models.

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