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LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method

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S. Wallington, C.S. Kochanek & R. Narayan (Harvard-Smithsonian Center For Astrophysics)

Astrophysics · Submitted 28 Nov 1995

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

The authors' main claim These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

how it is stated · hedged possibility 0.96 read the record →

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arXiv IDastro-ph/9511137 (version 1)
Pith ID3NSLPEKA, Pith's permanent record of this paper and its review
CitationC.S. Kochanek & R. Narayan (Harvard-Smithsonian Center For Astrophysics), S. Wallington. "LensMEM: A Gravitational Lens Inversion Algorithm Using the Maximum Entropy Method." arXiv:astro-ph/9511137 (1995). https://pith.science/paper/3NSLPEKA
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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-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,703 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.11 · states limitation 0.11 · human participants 0.01 · controlled comparison 0.18 · randomized assignment 0.01 · states quantitative result 0.99 · compares with prior results 0.98 · mentions code or data availability 0.03.

The abstract, sentence by sentence

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

We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is $b=0\parcs9820$, the dimensionless shear is $\gamma=0.0771$, and the position angle of the shear is $\theta=100\pdeg8$. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

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 We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). contribution 1.00 0.91 0.15 asserted 0.99
s1 We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. method 0.58 0.95 0.06 asserted 0.98
s2 We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is $b=0\parcs9820$, the dimensionless shear is $\gamma=0.0771$, and the position angle of the shear is $\theta=100\pdeg8$. result 0.99 0.96 0.30 asserted 1.00
s3 These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean. interpretation 0.77 0.22 0.22 hedged possibility 0.96

What kind of paper the classifier reports this is: method or tool 1.00 · evidence from analysis of existing data 0.63.

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
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  • 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

We present a new algorithm for inverting poorly resolved gravitational lens systems using the maximum entropy method (MEM). We test the method with simulations and then apply it to an 8 GHz VLA map of the radio ring lens MG1654+134. We model the lens as a singular isothermal sphere embedded in an external shear field and find the critical radius of the lens is $b=0\parcs9820$, the dimensionless shear is $\gamma=0.0771$, and the position angle of the shear is $\theta=100\pdeg8$. These results are consistent with the results obtained by Kochanek (1995) using a complementary inversion algorithm based on Clean.

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