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Optical Spectrum of Main-, Inter- and Off-pulse Emission from Crab Pulsar

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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Alberto Carraminana (1), Andrej Cadez (2), Tomaz Zwitter (2) ((1) I.N.A.O.E., Puebla, Mexico, (2) Univ. of Ljubljana, Ljubljana, Slovenia)

Astrophysics · Submitted 6 Jun 2000

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

The authors' main claim The main-pulse and the inter-pulse behave as power laws, both with the same de-reddened index Alpha = +0.2 +- 0.1.

how it is stated · asserted 1.00 read the record →

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arXiv IDastro-ph/0006075 (version 1)
Pith IDVMLX4JXT, Pith's permanent record of this paper and its review
Citation(2) Univ. of Ljubljana, Alberto Carraminana (1), Andrej Cadez (2), Ljubljana, Mexico, Puebla, Slovenia), Tomaz Zwitter (2) ((1) I.N.A.O.E.. "Optical Spectrum of Main-, Inter- and Off-pulse Emission from Crab Pulsar." arXiv:astro-ph/0006075 (2000). https://pith.science/paper/VMLX4JXT
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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, 6,767 input tokens.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.86 · human participants 0.02 · controlled comparison 0.53 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.25 · mentions code or data availability 0.02.

The abstract, sentence by sentence

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

A dedicated stroboscopic device was used to obtain optical spectra of the Crab main-pulse and inter-pulse as well as the spectrum of the underlying nebula when the pulsar is turned off. As the nebular emission is very inhomogeneous, our ability to effectively subtract the nebular background signal is crucial. No spectral lines intrinsic to the pulsar are detected. The main-pulse and the inter-pulse behave as power laws, both with the same de-reddened index Alpha = +0.2 +- 0.1. This value was obtained by subtracting the nebular spectrum at the exact position of the pulsar. The underlying nebula is redder, Alpha = -0.4 +- 0.1. Its emission lines are split into approaching (sim. -1200 km/s) and receding (sim. +600 km/s) components. The strength of emission line components and the flux in nebular continuum vary on arcsec scale. The nebular line and continuum intensities along the N-S slit are given.

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 A dedicated stroboscopic device was used to obtain optical spectra of the Crab main-pulse and inter-pulse as well as the spectrum of the underlying nebula when the pulsar is turned off. method 0.95 0.96 0.04 asserted 1.00
s1 As the nebular emission is very inhomogeneous, our ability to effectively subtract the nebular background signal is crucial. background 0.53 0.30 0.03 asserted 1.00
s2 No spectral lines intrinsic to the pulsar are detected. result 1.00 0.93 0.18 asserted 1.00
s3 The main-pulse and the inter-pulse behave as power laws, both with the same de-reddened index Alpha = +0.2 +- 0.1. result 1.00 0.91 0.44 asserted 1.00
s4 This value was obtained by subtracting the nebular spectrum at the exact position of the pulsar. method 0.99 0.95 0.07 asserted 1.00
s5 The underlying nebula is redder, Alpha = -0.4 +- 0.1. result 1.00 0.91 0.11 asserted 1.00
s6 Its emission lines are split into approaching (sim. -1200 km/s) and receding (sim. +600 km/s) components. result 1.00 0.87 0.05 asserted 1.00
s7 The strength of emission line components and the flux in nebular continuum vary on arcsec scale. result 1.00 0.89 0.04 asserted 1.00
s8 The nebular line and continuum intensities along the N-S slit are given. result 0.84 0.89 0.04 asserted 0.93

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

What was examined, and what was not

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not examined
  • full text
  • figures and tables
  • references and citing sentences
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  • 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

A dedicated stroboscopic device was used to obtain optical spectra of the Crab main-pulse and inter-pulse as well as the spectrum of the underlying nebula when the pulsar is turned off. As the nebular emission is very inhomogeneous, our ability to effectively subtract the nebular background signal is crucial. No spectral lines intrinsic to the pulsar are detected. The main-pulse and the inter-pulse behave as power laws, both with the same de-reddened index Alpha = +0.2 +- 0.1. This value was obtained by subtracting the nebular spectrum at the exact position of the pulsar. The underlying nebula is redder, Alpha = -0.4 +- 0.1. Its emission lines are split into approaching (sim. -1200 km/s) and receding (sim. +600 km/s) components. The strength of emission line components and the flux in nebular continuum vary on arcsec scale. The nebular line and continuum intensities along the N-S slit are given.

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