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Historical light curve of the black hole binary V4641 Sgr based on the Moscow and Sonneberg plate archives

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arxiv 1410.2055 v1 pith:NBDJG574 submitted 2014-10-08 astro-ph.HE

Historical light curve of the black hole binary V4641 Sgr based on the Moscow and Sonneberg plate archives

E. A. Barsukova , V. P. Goranskij , P. Kroll This is my paper
classification astro-ph.HE
keywords outburstphotographicarchivesbinaryblackdataholelarge
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We performed digital processing of a large set of photographic plates for X-ray binary system V4641 Sgr containing a black hole. A total of 277 plates were found in archives dated between 1960 and 1992. Photographic observations revealed lower level of outburst activity if to compare with CCD data after the large 1999 outburst. Only single outburst which happened in 1978 was confirmed. If archive photographic data are used along with contemporary CCD observations, the orbital period may be improved, and its value is 2.81728 +/-0.00004 day.

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  1. Leptonic and hadronic models of high-energy nebula around V4641 Sgr

    astro-ph.HE 2025-12 conditional novelty 4.0

    Protons produce the >100 TeV gamma-ray halo of V4641 Sgr while freshly accelerated electrons produce its X-rays, a mixed leptohadronic model that matches the observed spectrum and morphology.