Evolution of the Host Galaxies in Low- Power AGN

Details Evolution of the Host Galaxies in Low- Power AGN Evolution of the Host Galaxies in Low- Power AGN

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9121u&link_type=abstract

HST Proposal ID #9121

Computer Science

Hst Proposal Id #9121 Agn/Quasars

Scientific paper

HST has provided definitive observations of AGN host galaxies, over a large redshift range. These can be used to measure the cosmic evolution of host galaxies and to assess the connection between the formation and evolution of active nuclei {black holes} and galaxies. This requires covering a range in luminosity at each redshift, however, in order to distinguish dependences on redshift and on luminosity, which {unfortunately} are automatically well correlated in flux- limited samples. Yet *very* few low-power AGN have been imaged at high redshift {z > 0.5} with HST. We propose to fill this critical gap by observing 10 BL Lac objects in the STIS CCD long-pass filter {to maximize sensitivity and spatial sampling}. BL Lacs are the only low-power AGN in complete samples to sufficient redshift {z> 1} to detect the effects of passive evolution of the host galaxies. Results for a closely matched sample at redshifts z <=sssim 0.5 are already available from our HST snapshot survey of BL Lac objects, which yielded detailed information on host galaxy morphologies, magnitudes, surface brightness profiles, and effective radii at low redshift. The proposed study thus probes the evolution of low-power AGN host galaxies to z 1.3, and allows direct study of how the formation and life cycles of radio-loud AGN depend on intrinsic power.

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