Journal
ASTROPHYSICAL JOURNAL
Volume 750, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/750/1/70
Keywords
hydrodynamics; pulsars: individual (PSR B1259-63); radiation mechanisms: non-thermal; stars: individual (LS 2883)
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [23105709]
- Japan Society for the Promotion of Science (JSPS) [19104006, 23340069, 23540271]
- Joint Usage/Research Center for Interdisciplinary Large-scale Information Infrastructures in Japan
- MEXT of Japan
- NASA [NNX11AC40G]
- iiC collaborative research program [23105709, 18104003, 19047004, 19740100, 20540236, 21105509, 21540304, 22340045, 22540243]
- Hokkai-Gakuen Educational Foundation
- Grants-in-Aid for Scientific Research [22540315, 24540235, 12F02022, 23340069, 23540271, 11J00186] Funding Source: KAKEN
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Temporal changes of X-ray to very high energy gamma-ray emissions from the pulsar-Be-star binary PSR B1259-63/LS 2883 are studied based on three-dimensional smoothed particle hydrodynamic simulations of pulsar wind interaction with Be-disk and wind. We focus on the periastron passage of the binary and calculate the variation of the synchrotron and inverse-Compton emissions using the simulated shock geometry and pressure distribution of the pulsar wind. The characteristic double-peaked X-ray light curve from observations is reproduced by our simulation under a dense Be-disk condition (base density similar to 10(-9) g cm(-3)). We interpret the pre- and post-periastron peaks as being due to a significant increase in the conversion efficiency from pulsar spin-down power to the shock-accelerated particle energy at orbital phases when the pulsar crosses the disk before periastron passage, and when the pulsar wind creates a cavity in the disk gas after periastron passage, respectively. On the contrary, in the model TeV light curve, which also shows a double-peak feature, the first peak appears around the periastron phase. The possible effects of cooling processes on the TeV light curve are briefly discussed.
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