Identifying Jittering Jet-shaped Ejecta in the Cygnus Loop Supernova Remnant

Identifying Jittering Jet-shaped Ejecta in the Cygnus Loop Supernova Remnant

Blog Article

Analyzing images of the Cygnus Loop, a core-collapse supernova (CCSN) Blank remnant, in different emission bands, we identify a point-symmetrical morphology composed of three symmetry axes that we attribute to shaping by three pairs of jets.The main jet axis has an elongated S shape, appearing as a faint narrow zone in visible and UV.We term it the S-shaped hose, and the structure of three symmetry lines the point-symmetric wind rose.The two other lines connect a protrusion (an ear or a bulge) with a hole on the opposite side of the center (a nozzle or a cavity), structures that we identify in the X-ray, UV, visible, IR, and/or radio images.

There is a well-known blowout at the southern end of the S-shaped hose, and we identify a possible opposite blowout at the northern end of the S-shaped hose.The point-symmetrical morphology of the Cygnus Loop is according to the expectation of the jittering jets explosion mechanism (JJEM) of CCSNe, where several to few tens of LIP BALM W VIT pairs of jets with stochastically varying directions explode the star.The three pairs of jets that shaped the wind-rose structure of the Cygnus Loop are the last energetic pairs of this series of jets.Our study further supports the JJEM as the main explosion mechanism of CCSNe.