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Cassiopeia A’s many faces – Astronomy Now

June 23, 2024
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Cassiopeia A’s many faces – Astronomy Now
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Picture: NASA/ESA/CSA/STScI/D. Milisavljevic (Purdue College)/T. Temim (Princeton College)/I. De Unfastened (College of Gent).

That is the James Webb Area Telescope’s (JWST’s) second view of the Cassiopeia A (Cas A) supernova remnant – its first was captured by its Mid-Infrared Instrument (MIRI) in April 2023. This new picture was taken by the JWST’s Close to-Infrared Digital camera (NIRCam) and exhibits important variations within the particulars in comparison with the MIRI picture.

Cas A is the stays of a large star that exploded within the late seventeenth century, though nobody seen it on the time. Situated 11,000 gentle years away, the brilliant clumps of orange and pink (each false colors) close to the centre are composed of argon, neon, oxygen and sulphur – all innards of the mighty star that turned itself inside-out. Within the MIRI picture, the outer fringe of the primary shell of particles is shiny, however to NIRCam it seems faint and wispy. The outer fringe of the shell is the place the supernova blast wave is crashing into circumstellar materials expelled by the star earlier than it exploded. The mud on this materials remains to be too cool to be detected at shorter infrared wavelengths.

Additionally lacking within the NIRCam picture in comparison with MIRI’s view is the ‘Inexperienced Monster’ – the nickname given to a hoop of inexperienced gentle (once more, false color) within the remnant’s central cavity. NIRCam can see ionised gasoline (the purple and white colored emission) believed to be brought on by the supernova particles pushing previous and shaping the circumstellar materials to kind the Inexperienced Monster.

Picture: NASA/ESA/CSA/STScI/D. Milisavljevic (Purdue College)/T. Temim (Princeton College)/I. De Unfastened (College of Gent).



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