Cosmic 'dust' from supernovae hints at how stars are born SETIInstitute nature
Polarized dust emission detected in far-infrared belongs to the SNR, and supernovae are producers of a large mass of dust Silicate grains are the dominant dust to have such strong polarizationDr. Jeonghee Rho, a research scientist at the SETI Institute and the lead author of this research, said that the polarizedbelongs to the SNR Cas A and is not random interstellar emission. Studying far-infrared emissions is tricky since it is everywhere in the sky.
The magnetic field directions are shown on the SOFIA far-infrared image using the High-Resolution Airborne Wideband Camera Plus on board SOFIA. The magnetic field strength in Cas A is very strong, 100 milli-Gauss inferred by the polarization measurements. The polarization is relatively weak where the far-infrared emission is stronger . Credit: SETI Institute
SOFIA's polarization in Cas A combining Spitzer and Herschel images implies an estimate of a magnetic field of approximately 100 milli-Gauss. It puts Cas A as one of the strongest magnetic field sources. The grain alignment in supernova ejecta occurs with the magnetic fields, and dust polarization can reliably trace theWhile the polarization shows a tight magnetic field at the center and southeastern shell, the polarization fraction is higher at the place between the two dust structures.
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