科研之友
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摘要
We report the discovery of 70.5 ms pulsations from the X-ray source AX J1838.0-0655 using the Rossi X-Ray Timing Explorer (RXTE). PSR J1838-0655 is a rotation-powered pulsar with spin-down luminosity E = 5.5 x 10(36) ergs s(-1), characteristic age tau(c) equivalent to P/2P = 23 kyr, and surface dipole magnetic field strength B(s) = 1.9 x 10(12) G. It coincides with an unresolved INTEGRAL source and the extended TeV source HESS J1837-069. At an assumed distance of 6.6 kpc by association with an adjacent massive star cluster, the efficiency of PSR J1838-0655 converting spin-down luminosity to radiation is 0.8% for the 2-10 keV ASCA flux, 9% for the 20-300 keV INTEGRAL flux and similar to 3% for the > 200 GeV emission of HESS J1837-069, making it a plausible power source for the latter. A Chandra X-ray observation resolves AX J1838.0-0655 into a bright point source surrounded by a 2' diameter, centrally peaked nebula. The spectra of the pulsar and nebula are each well fitted by power laws, with photon indices Gamma- 0.5(0.3-0.7) and Gamma = 1.6(1.1-2. 0), respectively. The 2 10 keV X-ray luminosities of the pulsar and nebula are L(PSR) = 4.6 x 10(34) d(2)(6.6) ergs s(-1) and L(PWN) = 5.2 x 10(33) d(2)(6.6) ergs s(-1). A second X-ray source adjacent to the TeV emission, AX J1837.3-0652, is resolved into an apparent pulsar/PWN; it may also contribute to HESS J1837-069. The star cluster RSGC 1 may have given birth to one or both pulsars, while fueling TeVemission from the extendedPWNwith target photons for inverse Compton scattering.
- 出版日期2008-7-1
