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Title:
The X-Ray Structure and Spectrum of the Pulsar Wind Nebula Surrounding PSR B1853+01 in W44
Authors:
Petre, R.; Kuntz, K. D.; Shelton, R. L.
Affiliation:
AA(NASA Goddard Space Flight Center, Greenbelt, MD 20771), AB(NASA Goddard Space Flight Center, Greenbelt, MD 20771), AC(Henry A. Rowland Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218)
Publication:
The Astrophysical Journal, Volume 579, Issue 1, pp. 404-410. (ApJ Homepage)
Publication Date:
11/2002
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: W44, Stars: Pulsars: Individual: Alphanumeric: PSR B1853+01, ISM: Supernova Remnants, X-Rays: General
DOI:
10.1086/342672
Bibliographic Code:
2002ApJ...579..404P

Abstract

We present the result of a Chandra ACIS observation of the pulsar PSR B1853+01 and its associated pulsar wind nebula (PWN), embedded in the supernova remnant W44. A hard-band ACIS map cleanly distinguishes the PWN from the thermal emission of W44. The nebula is extended in the north-south direction, with an extent about half that of the radio emission. Morphological differences between the X-ray and radio images are apparent. Spectral fitting reveals a clear difference in spectral index between the hard emission from PSR B1853+01 (Γ~1.4) and the extended nebula (Γ~2.2). The more accurate values for the X-ray flux and spectral index are used to refine estimates for PWN parameters, including magnetic field strength, the average Lorentz factor γ of the particles in the wind, the magnetization parameter σ, and the ratio k of electrons to other particles.
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