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- Title
Fermi-LAT Observation of PSR B1259-63 during Its 2021 Periastron Passage.
- Authors
Zhi Chang; Shu Zhang; Yu-Peng Chen; Long Ji; Ling-Da Kong; Peng-Ju Wang
- Abstract
PSR B1259-63 is a g-ray binary system, where the compact object is a pulsar. The system has an orbital period of 1236.7 days and shows peculiar g-ray flares (in 100MeV–300 GeV) after its periastron time. We analyzed the Fermi-LAT observation of PSR B1259-63 during its latest periastron passage, as well as its previous three periastrons. The bright GeV flares started about 60 days after the periastron epoch in 2021. This delay is larger than that around the 2017 periastron and much larger than earlier periastrons. The delay of the GeV flux peak time in each periastron passage is apparent in our results. We discussed the possible origin of this delay and made a prediction of the GeV flux peak time in next periastron passage, based on observation of the previous delays.
- Subjects
GAMMA ray measurement; ELECTROMAGNETIC waves; PULSARS; PULSATING stars; STELLAR magnetic fields
- Publication
Universe (2218-1997), 2021, Vol 7, Issue 12, p1
- ISSN
2218-1997
- Publication type
Article
- DOI
10.3390/universe7120472