Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7866p&link_type=abstract
HST Proposal ID #7866
Other
Hst Proposal Id #7866 Agn And Quasars
Scientific paper
As part of our ongoing investigation of the M87 jet, we propose to add concurrent NICMOS observations to our already- approved Cycle 7-9 suite of optical {WFPC2} and near-UV {FOC} observations. Our cycle 4-6 monitoring program reveals striking evolution in the jet structure over a 2 year period. A number of superluminal components are seen, with speeds between 2c and 6c; and many components vary significantly with time, with new ones emerging and others fading from view during this short timespan. The proposed observations will give us the unique opportunity to track the secular evolution of the synchrotron spectrum of superluminal components in the jet. The turnover frequency and spectral index of these components is expected to respond sensitively to the acceleration and energy loss mechanisms at work in extragalactic jets. As superluminal components are born, the synchrotron component should become harder and the turnover frequency should increase. Later evolutionary stages should see a gradual softening of the spectrum and a decrease in the turnover frequency as the components fade and synchrotron losses dominate. Models based upon non-simultaneous ground- based data predict that the turnover wavelength of most or all jet components should be between 0.5 and 2 microns.
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