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Title:
The Pulsar Wind Nebula in G11.2-0.3
Authors:
Roberts, Mallory S. E.; Tam, Cindy R.; Kaspi, Victoria M.; Lyutikov, Maxim; Vasisht, Gautam; Pivovaroff, Michael; Gotthelf, Eric V.; Kawai, Nobuyuki
Affiliation:
AA(Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal QC H3A 2T8, Canada; Department of Physics and Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139.; Quebec Merit Fellow.), AB(Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal QC H3A 2T8, Canada), AC(Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal QC H3A 2T8, Canada; Department of Physics and Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139.; Alfred P. Sloan Research Fellow, Canada Research Chair.), AD(Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal QC H3A 2T8, Canada), AE(Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109), AF(Space Sciences Laboratory, University of California, Berkeley, 260 SSL 7450, Berkeley, CA 94720-7450), AG(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027), AH(Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan)
Publication:
The Astrophysical Journal, Volume 588, Issue 2, pp. 992-1002. (ApJ Homepage)
Publication Date:
05/2003
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: General, Stars: Pulsars: Individual: Alphanumeric: AX J1811.5-1926, Stars: Neutron, Stars: Supernovae: Individual: Alphanumeric: G11.2-0.3, X-Rays: General
DOI:
10.1086/374266
Bibliographic Code:
2003ApJ...588..992R

Abstract

We present an X-ray and radio study of the wind nebula surrounding the central pulsar PSR J1811-1925 in the supernova remnant G11.2-0.3. Using high-resolution data obtained with the Chandra X-Ray Observatory and with the VLA radio telescope, we show the X-ray and radio emission is asymmetric around the pulsar, despite the latter's central position in the very circular shell. The new X-ray data allow us to separate the synchrotron emission of the pulsar wind nebula from the surrounding thermal emission and that from the pulsar itself. On the basis of X-ray data from two epochs, we observe temporal variation of the location of X-ray hot spots near the pulsar, indicating relativistic motion. We compare thermal emission observed within the shell, which may be associated with the forward shock of the pulsar wind nebula, to thermal emission from a nearby portion of the remnant shell, the temperature of which implies an expansion velocity consistent with the identification of the remnant with the historical event of 386 A.D. The measured X-ray and radio spectral indices of the nebula synchrotron emission are found to be consistent with a single synchrotron cooling break. The magnetic field implied by the break frequency is anomalously large, given the apparent size and age of the nebula, if a spherical morphology is assumed but is consistent with a bipolar morphology.
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