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Title:
G328.4+0.2: A Large and Luminous Crab-like Supernova Remnant
Authors:
Gaensler, B. M.; Dickel, J. R.; Green, A. J.
Affiliation:
AA(Center for Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA 02139; .; Hubble Fellow), AB(Astronomy Department, University of Illinois, 1002 West Green Street, Urbana, IL 61801; .; Netherlands Foundation for Research in Astronomy, PO Box 2, 7990 AA Dwingeloo, The Netherlands), AC(Astrophysics Department, University of Sydney, NSW 2006, Australia; )
Publication:
The Astrophysical Journal, Volume 542, Issue 1, pp. 380-385. (ApJ Homepage)
Publication Date:
10/2000
Origin:
UCP
ApJ Keywords:
ISM: individual (G328.4+0.2, G74.9+1.2, N157B), Stars: Pulsars: General, Radio Continuum: ISM, ISM: Supernova Remnants
DOI:
10.1086/309522
Bibliographic Code:
2000ApJ...542..380G

Abstract

We report on radio continuum and H I observations of the radio source G328.4+0.2 using the Australia Telescope Compact Array. Our results confirm G328.4+0.2 to be a filled-center nebula with no surrounding shell, showing significant linear polarization and an almost flat spectral index. These results lead us to conclude that G328.4+0.2 is a Crab-like, or ``plerionic,'' supernova remnant (SNR), presumably powered by an unseen central pulsar. H I absorption toward G328.4+0.2 puts a lower limit on its distance of 17.4+/-0.9 kpc, making it the largest (D=25 pc) and most luminous (LR=3×1035 ergs s-1) Crab-like SNR in the Galaxy. We infer G328.4+0.2 to be significantly older than the Crab Nebula, but powered by a pulsar which is fast spinning (P<20 ms) and which has a comparatively low magnetic field (B<1012 G). We propose G328.4+0.2, G74.9+1.2, and N157B as a distinct group of large-diameter, high-luminosity Crab-like SNRs, all powered by fast-spinning low-field pulsars.
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