The spectral turnover of the 'filled-center' supernova remnant 3C 58: Implications for when acceleration occurs

Details The spectral turnover of the 'filled-center' supernova remnant 3C 58: Implications for when acceleration occurs The spectral turnover of the 'filled-center' supernova remnant 3C 58: Implications for when acceleration occurs

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..817g&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 817-821

Astronomy and Astrophysics

Astronomy

6

Crab Nebula, Interstellar Matter, Mathematical Models, Particle Acceleration, Supernova Remnants, Ephemeris Time, Flux Density, Infrared Astronomy Satellite, Light Curve, Maximum Likelihood Estimates, Power Spectra

Scientific paper

IRAS observations the 'filled-center' supernova remnant 3C 58 are used to derived upper limits of 0.4, 0.4, 0.8, and 1.5 Jy for its infrared flux density at 12, 25, 60, and 100 micrometers, respectively. These values imply a break in the spectrum of 3C58 above a few tens of gigahertz -- two orders of magnitude below the break in the spectrum of the Crab Nebula -- with a change of spectral index across the break for 3C58 of more than 0.5. This is similar to previous results for another 'filled-center' remnant, G74.9+1.2, from radio observations alone. This implies that their emission is not dominated by a constant injection rate of particles with a power-law distribution. Either the break is due to synchrotron losses in the past, with little particle injection in recent times or it is intrinsic to the acceleration mechanism at work (presumably from a central neutron star).

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