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Discovery of extended structures around two evolved planetary nebulae M2-55 and Abell 2

Zhang, Yong; Hsia, Chih-Hao; Zhang, Xi-Liang +1 more

We report a multi-wavelength study of two evolved planetary nebulae (PNs)M2-55 and Abell 2. Deep optical narrow-band images ([O III], Hα, and [N II]) of M2-55 reveal two pairs of bipolar lobes and a new faint arc-like structure. This arc-shaped filament around M2-55 appears as a well-defined boundary from southwest to southeast, strongly suggestin…