Cassiopeia A at 86 gigahertz - Spectral and rotation measure differences

Details Cassiopeia A at 86 gigahertz - Spectral and rotation measure differences Cassiopeia A at 86 gigahertz - Spectral and rotation measure differences

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..644k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. 644-650.

Astronomy and Astrophysics

Astronomy

12

Nebulae, Polarimetry, Radio Sources (Astronomy), Supernova Remnants, Brightness Distribution, Linear Polarization, Radiant Flux Density, Spectral Energy Distribution

Scientific paper

The 86.2 GHz linear polarization and total brightness of Cassiopeia A have been mapped with an angular resolution of 60 arcmin using the 14-m Five College Radio Astronomy Observatory millimeter-wave telescope. The total flux density is measured to be significantly higher than expected from an extrapolation of the low-frequency power-law spectrum. A marginally significant spectral index difference between the eastern and western quadrants is attributed to temporal variations in the brightness distribution of Cas A. The polarized brightness and distribution of polarization position angles at 86.2 GHz are similar to those at 15, 19, and 33 GHz. Rotation measures in the northwest region are about 80 rad/sq m greater than those in the southeast. This result, together with the asymmetric Doppler shifts of X-ray emission lines, implies that most of the radiation from the northwest region of Cas A originates on the far side of the remnant. This rotation measure difference provides additional support for the model of Cas A as a clumpy, expanding ring of matter tilted with respect to the line of sight.

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