Constraints on the Evolution of Powerful Radio Galaxies

Details Constraints on the Evolution of Powerful Radio Galaxies Constraints on the Evolution of Powerful Radio Galaxies

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8104o&link_type=abstract

HST Proposal ID #8104

Physics

Hst Proposal Id #8104 Agn Physics

Scientific paper

Recent work has identified the GHz Peaked Spectrum {GPS} and Compact Steep Spectrum {CSS} radio sources as the most likely candidates for the progenitors of the large scale powerful classical double {3CR FR2} sources. WFPC2 LRF images have revealed the presence of bright emission line gas aligned with and in projection co-spatial with the radio source. Ground based observations of broad and highly structured OIIILambda 5007 lines strongly suggest that the radio source is dominating the emission line kinematics. We propose to observe 3 CSS sources with STIS long-slit spectroscopy in order to determine the kinematics and physical properties of the emission line gas interacting with the radio source. We will use diagnostic line ratios to estimate the temperature and density of the gas. From the velocity field, we will derive constraints on the expansion velocity of the radio source and on the radio source lifetime, both of which are fundamental parameters needed to constrain th e evolution of powerful radio sour ces.

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