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Paper: 3C 84
Volume: 300, Radio Astronomy at the Fringe
Page: 113
Authors: Walker, R.C.
Abstract: VLBI studies of 3C 84 show a bright, complex structure that is expanding sub-luminally and whose origin extrapolates back to the major increase in flux density that occurred around 1960. At high frequencies, the structure is two sided. The relative brightness and size of the northern and southern features can be explained in terms of a twin jet inclined about 44° to the line-of-sight and moving at about 0.37c. The smaller and weaker feature to the north is free-free absorbed at low frequencies while the southern feature is not. The free-free absorption constrains the properties of ionized gas in the region of the accretion disk feeding the black hole that is thought to power the source.
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