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Article: Evidence on the Orbital Modulated Gamma-Ray Emissions from the Redback Candidate 3FGL J2039.6–5618

TitleEvidence on the Orbital Modulated Gamma-Ray Emissions from the Redback Candidate 3FGL J2039.6–5618
Authors
KeywordsBinaries: close
Gamma rays: stars
Pulsars: individual (3FGL J2039.6-5618)
Stars: neutron
Issue Date2018
PublisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2018, v. 867 n. 2, article no. 90, p. 1-10 How to Cite?
AbstractUsing 9.5 yr of Fermi Large Area Telescope data, we report the evidence on the orbital modulated gamma-ray emissions from the redback candidate 3FGL J2039.6-5618. We produced the folded light curve with the orbital period of similar to 5.47 hr at a similar to 4 sigma level. We also computed the gamma-ray spectra in two orbital phases corresponding to the inferior conjunction and the superior conjunction. We found that the <3 GeV excess in the spectrum of inferior conjunction can be modeled by the inverse Compton scattering between a relativistic pulsar wind and background soft photons of the companion star. The orbital modulation can also be explained by the evolving collision angle between the particles and photons in the same model. Through period searches by the Rayleigh test and the flux variability, we speculate that the orbital modulation is not detected after MJD similar to 57,000. We propose a possible explanation in which the intrabinary shock is located closer to the pulsar so that the pulsar wind carries a smaller Lorentz factor. We estimated that the resultant inverse Compton component will be too soft and too weak to be observed.
Persistent Identifierhttp://hdl.handle.net/10722/266099
ISSN
2017 Impact Factor: 5.551
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorNg, CW-
dc.contributor.authorTakata, J-
dc.contributor.authorStrader, J-
dc.contributor.authorLi, KL-
dc.contributor.authorCheng, KS-
dc.date.accessioned2018-12-17T02:16:47Z-
dc.date.available2018-12-17T02:16:47Z-
dc.date.issued2018-
dc.identifier.citationThe Astrophysical Journal, 2018, v. 867 n. 2, article no. 90, p. 1-10-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/266099-
dc.description.abstractUsing 9.5 yr of Fermi Large Area Telescope data, we report the evidence on the orbital modulated gamma-ray emissions from the redback candidate 3FGL J2039.6-5618. We produced the folded light curve with the orbital period of similar to 5.47 hr at a similar to 4 sigma level. We also computed the gamma-ray spectra in two orbital phases corresponding to the inferior conjunction and the superior conjunction. We found that the <3 GeV excess in the spectrum of inferior conjunction can be modeled by the inverse Compton scattering between a relativistic pulsar wind and background soft photons of the companion star. The orbital modulation can also be explained by the evolving collision angle between the particles and photons in the same model. Through period searches by the Rayleigh test and the flux variability, we speculate that the orbital modulation is not detected after MJD similar to 57,000. We propose a possible explanation in which the intrabinary shock is located closer to the pulsar so that the pulsar wind carries a smaller Lorentz factor. We estimated that the resultant inverse Compton component will be too soft and too weak to be observed.-
dc.languageeng-
dc.publisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsThe Astrophysical Journal. Copyright © American Astronomical Society, co-published with Institute of Physics Publishing, Inc.-
dc.subjectBinaries: close-
dc.subjectGamma rays: stars-
dc.subjectPulsars: individual (3FGL J2039.6-5618)-
dc.subjectStars: neutron-
dc.titleEvidence on the Orbital Modulated Gamma-Ray Emissions from the Redback Candidate 3FGL J2039.6–5618-
dc.typeArticle-
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hk-
dc.identifier.authorityCheng, KS=rp00675-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3847/1538-4357/aae308-
dc.identifier.hkuros296235-
dc.identifier.volume867-
dc.identifier.issue2-
dc.identifier.spagearticle no. 90, p. 1-
dc.identifier.epage10-
dc.identifier.isiWOS:000449168500006-
dc.publisher.placeUnited States-

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