2008/03/31 by E. V. Gotthelf, J. P. Halpern · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysical Phenomena and Observations #Crab Nebula #Earth Systems and Cosmic Evolution #Flux (metallurgy) #Luminosity #Millisecond pulsar #Nebula #Photon #Point source #Pulsar #Pulsar wind nebula #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1086/588779
Comments: 8 pages, 7 figure, Latex, emulateapj style. To appear in the Astrophysical Journal
arxiv created 2008/04/11 · openalex publication_date 2008/07/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Ė = 5.5 × 10 36 ergs s −1 , characteristic age τ c ≡ P /2 = 23 kyr, and surface dipole magnetic field strength B s = 1.9 × 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 ~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 Γ = 0.5(0.3–0.7) and Γ = 1.6(1.1–2.0) , respectively. The 2–10 keV X-ray luminosities of the pulsar and nebula are L PSR = 4.6 × 10 34 d 2 6.6 ergs s −1 and L PWN = 5.2 × 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 TeV emission from the extended PWN with target photons for inverse Compton scattering.