Physics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.162...63v&link_type=abstract
In ESA Opt. Jets in Galaxies p 63-67 (SEE N81-27993 18-88)
Physics
1
Emission Spectra, Extragalactic Radio Sources, Plasma Jets, Continuous Radiation, Flow Velocity, Interstellar Gas, Line Spectra, Photoionization, Polarized Light, Radio Emission, Relativistic Plasmas
Scientific paper
Optical emission was detected both from the radio jet and from the outer lobe regions of the radio galaxy 3C 277.3 (Coma A) at a redshift of 0.0857. Two optical continuum knots are seen in the jet, the brighter of which is found to be 12% polarized with the magnetic vector along the jet. Intense optical emission lines were observed from the knot region of the jet and from regions near the peripheries of the radio lobes. Evidence is presented that this line-emitting gas, which extends over distances of 60 kpc, is related to the gas responsible for the depolarization of the radio continuum. The measurements of line strengths are used to place constraints on the physical conditions in this gas and rule out heating in shocks as the dominant source of energy input in the region of the jet. The gas is shown to be moving at velocities of up to a few hundred kilometers per second with respect to the nucleus. The origin of this gas and the possibility of using its velocity distribution to trace the kinematics of the relativistic plasma are discussed.
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