Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7855o&link_type=abstract
HST Proposal ID #7855
Computer Science
Hst Proposal Id #7855 Agn And Quasars
Scientific paper
Our proposed NICMOS observations combined with our multiwavelength observing program will finally provide us with the data we need to build a picture of how powerful radio galaxies evolve. We propose to image matched samples of compact GHz Peaked Spectrum, intermediate scale Compact Steep Spectrum and large scale classical double 3CR FR2 sources with NIC2 in the F110W ``J" and F205W ``K" filters. The J and K bands will give us a baseline in wavelength over which to determine accurate colors and which is still within the most sensitive bands in NICMOS. The 0arcs075 pixels in NIC2 will give us the needed resolution for accurate determination of stellar population color gradients and the proper isolation of the AGN colors. Model fits with stellar synthesis code will yield metallicity and ages of the underlying stellar population. The accurate determination of the nuclear near-IR flux enables us to compare the AGN output as seen by the nearby hot dust as a function of radio source size and age. The range of radio size scales in our sample corresponds to a range in radio source ages of ~ 10^4 - 10^7-8 yr. We therefore will be able to study the evolution of the AGN output relative to the total radio luminosity over the entire range of radio source ages. This is a critical constraint on the current evolution model which requires strong luminosity evolution of radio sources.
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