Spectral components of the radio composite supernova remnant G11.2-0.3

Cindy Tam, Mallory S.E. Roberts, Victoria M. Kaspi

Research output: Contribution to journalArticlepeer-review


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 = 0.25-0.10-0.05. 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.

Original languageEnglish (US)
Pages (from-to)202-208
Number of pages7
JournalAstrophysical Journal
Issue number1 I
StatePublished - Jun 10 2002


  • Pulsars: individual (PSR J1811-1925)
  • Radio continuum: ISM
  • Supernova remnants
  • Supernovae: individual (G11.2-0.3)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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