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A Radio Pulsar Search of the Gamma-ray Binaries LS I +61 303 and LS 5039
High Energy Astrophysical Phenomena · Submitted 28 Jun 2011
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The upper limits of flux density are between 4.1-14.5 uJy, and we discuss the null results of the search.
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The abstract, sentence by sentence
LS I +61 303 and LS 5039 are exceptionally rare examples of HMXBs with MeV-TeV emission, making them two of only five known or proposed "gamma-ray binaries". There has been disagreement within the literature over whether these systems are microquasars, with stellar winds accreting onto a compact object to produce high energy emission and relativistic jets, or whether their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind. Here we present an attempt to detect radio pulsars in both systems with the Green Bank Telescope. The upper limits of flux density are between 4.1-14.5 uJy, and we discuss the null results of the search. Our spherically symmetric model of the wind of LS 5039 demonstrates that any pulsar emission will be strongly absorbed by the dense wind unless there is an evacuated region formed by a relativistic colliding wind shock. LS I +61 303 contains a rapidly rotating Be star whose wind is concentrated near the stellar equator. As long as the pulsar is not eclipsed by the circumstellar disk or viewed through the densest wind regions, detecting pulsed emission may be possible during part of the orbit.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | LS I +61 303 and LS 5039 are exceptionally rare examples of HMXBs with MeV-TeV emission, making them two of only five known or proposed "gamma-ray binaries". | background 1.00 | 0.06 | 0.04 | asserted 1.00 |
| s1 | There has been disagreement within the literature over whether these systems are microquasars, with stellar winds accreting onto a compact object to produce high energy emission and relativistic jets, or whether their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind. | background 0.87 | 0.03 | 0.03 | asserted 0.85 |
| s2 | Here we present an attempt to detect radio pulsars in both systems with the Green Bank Telescope. | contribution 0.73 | 0.92 | 0.04 | asserted 0.85 |
| s3 | The upper limits of flux density are between 4.1-14.5 uJy, and we discuss the null results of the search. | result 1.00 | 0.95 | 0.40 | asserted 1.00 |
| s4 | Our spherically symmetric model of the wind of LS 5039 demonstrates that any pulsar emission will be strongly absorbed by the dense wind unless there is an evacuated region formed by a relativistic colliding wind shock. | interpretation 0.41 | 0.87 | 0.24 | asserted 1.00 |
| s5 | LS I +61 303 contains a rapidly rotating Be star whose wind is concentrated near the stellar equator. | background 0.76 | 0.22 | 0.03 | asserted 1.00 |
| s6 | As long as the pulsar is not eclipsed by the circumstellar disk or viewed through the densest wind regions, detecting pulsed emission may be possible during part of the orbit. | interpretation 0.93 | 0.28 | 0.15 | hedged possibility 1.00 |
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Original abstract
LS I +61 303 and LS 5039 are exceptionally rare examples of HMXBs with MeV-TeV emission, making them two of only five known or proposed "gamma-ray binaries". There has been disagreement within the literature over whether these systems are microquasars, with stellar winds accreting onto a compact object to produce high energy emission and relativistic jets, or whether their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind. Here we present an attempt to detect radio pulsars in both systems with the Green Bank Telescope. The upper limits of flux density are between 4.1-14.5 uJy, and we discuss the null results of the search. Our spherically symmetric model of the wind of LS 5039 demonstrates that any pulsar emission will be strongly absorbed by the dense wind unless there is an evacuated region formed by a relativistic colliding wind shock. LS I +61 303 contains a rapidly rotating Be star whose wind is concentrated near the stellar equator. As long as the pulsar is not eclipsed by the circumstellar disk or viewed through the densest wind regions, detecting pulsed emission may be possible during part of the orbit.
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2 arXiv papers cite this in 2 sentences
What it cites · 3 sentences without a confident label
Cites as background 1 paper
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[ref] argue that the keV–TeV variability of LS 5039 is due to to the injection of electrons into the relativistic jet in a low inclination binary orbit (which requires a black hole given the observed mass function; [ref] ).
New Optical Results on gamma-ray Binaries · Introduction · 0.81
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