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18th of June 2024
ASKAP (left) and JWST (right) images of NGC 5584, showing the ASKAP detection of the supernova remnant.
ASKAP-EMU Radio Emission from the Supernova Remnant SN1996aq in NGC 5584
by Zakir et al.
The nearby face-on spiral galaxy NGC 5584, at a distance of 23 megaparsecs (75 million light years) is a member of the Virgo III group of galaxies which are positioned to the east of the Virgo Supercluster. It has two known associated supernova (SN): SN1996aq and SN2007af. Zakir et al. report the ASKAP Evolutionary Map of the Universe (EMU) survey detection of radio continuum emission from SN1996aq, a Type Ic supernova within NGC 5584. Analysis at multiple radio frequencies reveals radio emission coincident with SN1996aq. A flatter radio spectral index is found compared to the 2009 observations, indicating rapid evolution of SN1996aq. Conversely, no radio emission is observed from NGC 5584's other known supernova, SN2007af. Furthermore, two other significant radio continuum regions were identified with properties consistent with ionized HII regions. The image above shows at left, the ASKAP-EMU radio-continuum image at 943 MHz at the resolution of 15 arcseconds × 15 arcseconds (with this beamsize shown in the bottom-right corner). At right is a James Webb Space Telescope NIRCam image with radio contours overlaid. Regions of interest are labeled and the squares represent the location of SN1996aq and SN2007af.



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