Suzaku Observations of PSR B1259-63: A New Manifestation of Relativistic Pulsar Wind

Journal Article · Mon Apr 27 00:00:00 EDT 2009 · Submitted to Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/698/1/911· OSTI ID:953002

Uchiyama, Yasunobu; Tanaka, Takaaki; Takahashi, Tadayuki; Mori, Koji; Nakazawa, Kazuhiro

We observed PSR B1259-63, a young non-accreting pulsar orbiting around a Be star SS 2883, eight times with the Suzaku satellite from July to September 2007, to characterize the X-ray emission arising from the interaction between a pulsar relativistic wind and Be star outflows. The X-ray spectra showed a featureless continuum in 0.6-10 keV, modeled by a power law with a wide range of photon index 1.3-1.8. When combined with the Suzaku PIN detector which allowed spectral analysis in the hard 15-50 keV band, X-ray spectra do show a break at {approx} 5 keV in a certain epoch. Regarding the PSR B1259-63 system as a compactified pulsar wind nebula, in which e{sup {+-}} pairs are assumed to be accelerated at the inner shock front of the pulsar wind, we attribute the X-ray spectral break to the low-energy cutoff of the synchrotron radiation associated with the Lorentz factor of the relativistic pulsar wind {gamma}{sub 1} {approx} 4 x 10{sup 5}. Our result indicates that Comptonization of stellar photons by the unshocked pulsar wind will be accessible (or tightly constrained) by observations with the Fermi Gamma-ray Space Telescope during the next periastron passage. The PSR B1259-63 system allows us to probe the fundamental properties of the pulsar wind by a direct means, being complementary to the study of large-scale pulsar wind nebulae.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 953002
• Report Number(s): SLAC-PUB-13585; arXiv:0904.1238
• Journal Information: Submitted to Astrophysical Journal, Journal Name: Submitted to Astrophysical Journal
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
Astrophysics
ASTRO
NEBULAE
PHOTONS
PROBES
PULSARS
SATELLITES
STARS
SYNCHROTRON RADIATION
TELESCOPES
X-RAY SPECTRA