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dc.contributor.authorSushch, Iurii
dc.contributor.authorVan Soelen, Brian
dc.date.accessioned2017-04-18T13:42:56Z
dc.date.available2017-04-18T13:42:56Z
dc.date.issued2017
dc.identifier.citationSushch, I. & Van Soelen, B. 2017. Gamma-gamma absorption in the γ-ray binary system PSR B1259-63/LS 2883. Astrophysical journal, 837: Article no 175. [http://iopscience.iop.org/journal/0004-637X]en_US
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/21449
dc.identifier.urihttps://doi.org/10.3847/1538-4357/aa62ff
dc.identifier.urihttp://iopscience.iop.org/article/10.3847/1538-4357/aa62ff/pdf
dc.description.abstractThe observed TeV light curve from the γ-ray binary PSR B1259-63/LS 2883 shows a decrease in the flux at periastron that has not been fully explained by emission mechanisms alone. This observed decrease can, however, be explained by γγ absorption due to the stellar and disk photons. We calculate the γγ absorption in PSR B1259-63/LS 2883 taking into account photons from both the circumstellar disk and star, assuming that the γ-rays originate at the position of the pulsar. The γγ absorption due to the circumstellar disk photons produces a ≈14% decrease in the flux, and there is a total decrease of ≈52% (>1 TeV) within a few days before periastron, accompanied by a hardening of the γ-ray photon index. While the γγ absorption alone is not sufficient to explain the full complexity of the H.E.S.S. γ-ray light curve, it results in a significant decrease in the predicted flux, which is coincident with the observed decrease. In addition, we have calculated an upper limit on the γγ absorption, assuming that the emission is produced at the apex of the bow shock. Future observations with CTA during the 2021 periastron passage may be able to confine the location of the emission based on the degree of γγ absorption, as well as measure the hardening of the spectrum around periastronen_US
dc.language.isoenen_US
dc.publisherIOPen_US
dc.subjectGamma rays: starsen_US
dc.subjectPulsars: individual (PSR B1259-63)en_US
dc.subjectRadiation mechanisms: non-thermalen_US
dc.subjectStars: individual (LS 5039)en_US
dc.titleGamma-gamma absorption in the γ-ray binary system PSR B1259-63/LS 2883en_US
dc.typeArticleen_US
dc.contributor.researchID24922986 - Sushch, Iurii


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