Investigating the Evolution of Quasar Host Galaxies with NICMOS

Mathematics – Logic

Scientific paper

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Scientific paper

We present the preliminary results of our Cycle 7 program to study the evolution of the host galaxies of radio-loud and radio-quiet quasars out to a redshift of 2. By careful choice of filters, and careful quasar sample selection we have ensured that (1) we sample the same spectral region at all redshifts (2) our images consist purely of starlight, uncontaminated by emission lines, and (3) our results are not biased by quasar luminosity correlating with redshift. With this data we can investigate the cosmological evolution of the luminosity, scale-length, and degree of disturbance in quasar hosts and thus obtain insights into several key questions about quasar activity including the mechanism behind the dramatic evolution in the quasar luminosity function. An initial, very crude analysis of our NICMOS images shows that we are detecting the hosts out to a redshift of ~2. The estimated galaxy luminosities are consistent with the values obtained for low-z quasars of the same luminosity.

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