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Title:
Spectral Components of the Radio Composite Supernova Remnant G11.2-0.3
Authors:
Tam, Cindy; Roberts, Mallory S. E.; Kaspi, Victoria M.
Affiliation:
AA(Department of Physics, Ernest Rutherford Physics Building, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada), AB(Department of Physics, Ernest Rutherford Physics Building, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada; Quebec Merit Fellow.; Department of Physics and Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139.), AC(Department of Physics, Ernest Rutherford Physics Building, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada)
Publication:
The Astrophysical Journal, Volume 572, Issue 1, pp. 202-208. (ApJ Homepage)
Publication Date:
06/2002
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: Individual: Alphanumeric: PSR 1811-1925, Radio Continuum: ISM, Stars: Supernovae: Individual: Alphanumeric: G11.2-0.3, ISM: Supernova Remnants
DOI:
10.1086/340229
Bibliographic Code:
2002ApJ...572..202T

Abstract

We present a high-resolution radio study of the supernova remnant (SNR) G11.2-0.3 using archival Very Large Array data. Spectral tomography is performed to determine the properties of this composite-type SNR's individual components, which have only recently been distinguished through X-ray observations. Our results indicate that the spectral index of the pulsar wind nebula (PWN), or plerion, is αP=0.25+0.05-0.10. We observe a spectral index of αS=0.56+/-0.02 throughout most of the SNR shell region but also detect a gradient in α in the southeastern component. We compare the spectral index and flux density with recent single-dish radio data of the source. Also, the radio efficiency and morphological properties of this PWN are found to be consistent with results for other known PWN systems.
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