An analysis of the proper motions of SS 433 radio jets

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Abstract

Four epochs of 4885 MHz VLA maps of SS 433 are used to show that the structure and changes in structure of the 0.1-5.0 arcsec size scale radio emission conform to a kinematic model for the proper motion of ejected radio emitting material. It is pointed out that this model is an extension of the kinematic twin-jet model for the optical jets of SS 433. The following model parameters are shown to give the best fit to all the data: the axis about which the jets rotate is inclined 80 deg to the line of sight in position angle 100 deg; the angle between the jets and the jet rotation axis is 20 deg; the jets rotate in a clockwise (left-handed) sense about the jet axis with a period of 164 days; the oppositely directed eastern and western jet rotation axes are on the near and far sides, respectively, of the central object; the ratio of constant jet velocity and the distance to SS 433 is 3.0 + or - 0.2 arcsec/yr; and the present capability of the radio data to determine an absolute jet velocity indicates a value of 0.26 times the speed of light and thus a distance of 5.5 kpc.

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