
Abstract Radio continuum observations of the central region of our Galaxy have revealed an off-plane, Ω-shaped lobe (the galactic center lobe: GCL) with a diameter 200 pc emerging from the nuclear disk toward the positive galactic latitude. The radio spectrum is flat, indicating either a thermal gas origin or synchrotron radiation due to recently accelerated cosmicray electrons. CO line observations show an association of a high-velocity molecular gas with the lobe ridges. The eastern and western lobe ridges are connected to the “radio arc” and Sgr C in which extremely thin filamentary structures are found with the VLA. This fact indicates an influence of a magnetic field on the GCL. The origin of the GCL is discussed in relation to an activity in the central region of the Galaxy. The GCL may be a cosmic jet perpendicular to the nuclear disk under a predominant influence of a strong magnetic field, and a magnetic-twist acceleration model is suggested as a favorable formation mechanism. We point out characteristics of the GCL and some radio lobes in edge-on spiral galaxies common to more energetic jets associated with quasars and radio galaxies based on a statistical plot of a lateral expansion rate of the jet against a radio power of the core source.
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