Evidence for single-temperature dust in the Crab nebula from a reanalysis of its infrared spectrum

Details Evidence for single-temperature dust in the Crab nebula from a reanalysis of its infrared spectrum Evidence for single-temperature dust in the Crab nebula from a reanalysis of its infrared spectrum

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.358..654s&link_type=abstract

Nature (ISSN 0028-0836), vol. 358, no. 6388, Aug. 20, 1992, p. 654, 655.

Astronomy and Astrophysics

Astronomy

28

Crab Nebula, Infrared Astronomy Satellite, Infrared Spectra, Neutron Stars, Synchrotron Radiation, Astronomical Spectroscopy, Background Radiation, Cosmic Dust, Flux Density, Supernova Remnants, Thermal Radiation

Scientific paper

IRAS data on the Crab Nebula revealed significant excess emission above the synchrotron spectrum, peaking between 60 and 100 microns (Marsden, 1984). This was attributed to thermal radiation by dust with at least two characteristic temperatures in the range 40-100 K. The IRAS data have been reanalyzed, taking care to remove contamination by background emission, and it is found that the revised IR flux densities are in fact well explained by a single dust component at a temperature of 46 K. The required dust mass is 0.02 solar masses corresponding to a gas to dust ratio of 100:1. The break frequency is more accurately determined to be 1.4 x 10 exp 13 Hz in the power-law spectrum. This value implies, for a steady-state synchrotron model, a time-averaged magnetic field of 420 micro G, which is less than the value corresponding to an equipartition of energy between radiating particles and magnetic field, but probably greater than the present field strength.

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