Abstract
A giant radio source with an unusual Z-shaped structure extending over nearly one degree on the sky has been detected around the nearby elliptical galaxy NGC315. The source has structure aligned with the minor axis of the optical galaxy on linear scales ranging from a few tens of kpc to ∼ 1.7 Mpc. There is also a bright compact (<48 pc) source with an opaque radio spectrum located in the galactic nucleus. The physical properties of the extended emission are compared with those of the other three well studied giant radio galaxies—DA 240, 3C236 and Centaurus A. The configurations of the giant systems with respect to their parent galaxies suggest that they are not produced by a gravitational slingshot process. The unusual morphology of the source is readily explained in terms of the rotating-beam model of Henriksen and Bridle.
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References
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Bridle, A., Davis, M., Meloy, D. et al. Giant radio galaxy NGC315. Nature 262, 179–182 (1976). https://doi.org/10.1038/262179a0
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DOI: https://doi.org/10.1038/262179a0
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