3C 293 is adisk galaxy based on multiwavelength observations.[5] It is described as having a peculiar appearance, a result of agalaxy merger with two close spaced nuclei only separating 870 kiloparsecs from each other. The galaxy has threedust lanes elongated across its central regions at the position angle of 35°. A central dust lane can be seen spitting into two other individual lane features in a southern direction from the nucleus.[6][7] Bright clumps of diffused filamentary emission are aligned together with the dust lanes.[8] There is a low-surface brightnesstidal tail stretching towards a small satelliteelliptical galaxy, implying it and the galaxy are interacting. At around 70 kiloparsecs west, the tail goes in a zig-zag pattern and terminates at what appears to bestar-forming regions. A second galaxy is seen, however it isn't interacting.[5][9]
The radio structure appears compact with a Z-shaped morphology. There is a kiloparsec-scale radio core displaying a steepradio spectrum, and dominating over a series of knots regions. The core is connected byradio emission which is formed into a ridge towards a bright hotspot.[10] In addition, the galaxy has two asymmetricradio lobes and ajet on two sides that is depicted as both misaligned and distorted.[11][12][13] The jet is shown to have akinetic power of 2-4 x 1043 erg s-1.[14]
Radio studies described 3C 293 as a double-double X-shaped radio galaxy with an inner pair of radio lobes and another pair of outer lobes.[11][15] The inner pair of lobes are estimated to have a spectral age at least one million years and a small overall linear size of 190kiloparsecs. Hotspots are also present, indicating the jet has interacted with the surroundinginterstellar medium from the galaxy.[11] Further studies have described the inner lobes as having a young compact steep spectrum (CSS) source, making the galaxy display a restartedactive galactic nucleus.[4]
The galaxy shows the presence ofionized gas outflows moving outwards at highvelocities of 1000 kilometers per seconds with warm gas having a totalmass of 1 x 105 Mʘ. This suggests the jet is responsible for driving the outflows.[12] Detections ofneutral hydrogen absorption have been noted in the galaxy via 21-centimeter wavelength observations and by theVery Large Array.[16][17] In the galaxy's center lies asupermassive black hole with a mass estimated as 1.6 x 108 Mʘ. The black hole is also said to be accreting at a fast rate with X-ray gas falling towards it.[15]
^Allen, Mark G.; Sparks, William B.; Koekemoer, Anton; Martel, Andre R.; O'Dea, Christopher P.; Baum, Stefi A.; Chiaberge, Marco; Macchetto, F. Duccio; Miley, George K. (April 2002). "Ultraviolet Hubble Space Telescope Snapshot Survey of 3CR Radio Source Counterparts at Low Redshift".The Astrophysical Journal Supplement Series.139 (2):411–438.arXiv:astro-ph/0112208.Bibcode:2002ApJS..139..411A.doi:10.1086/338823.ISSN0067-0049.
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