Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8275s&link_type=abstract
HST Proposal ID #8275
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #8275 Agn Hosts And Environment
Scientific paper
Radio galaxies are an important class of extragalactic objects, representing one of the most energetic astrophysical phenomena, while extraordinarily useful as probes of their environments and of the early Universe. In earlier Cycles we carried out extensive HST snapshot imaging of the 3CR sources to investigate their optical characteristics. Here we propose a major enhancement to a superb dataset: to obtain UV images of the 3CR sources at z < 0.1. A crucial motivation is to offer a zero redshift comparison sample for the extraordinary radio galaxy morhpologies found at high redshift {where UV emission is imaged}. Are we witnessing the effects of evolution or of wavelength? We aim to determine whether the alignment effect holds at zero redshift in the UV; we aim to identify regions of star formation along radio axes, associated with dust-lanes, tidal interactions, or elsewhere; we will probe old stellar populations by imaging old hot stars in these predominantly giant ellipticals and measuring radial and isophotal profiles; we will measure brightnesses and frequency of UV nuclei and measure dust extinction through the interesting 2200 Angstrom region; we will seek spectral turnovers in known synchrotron jets and hot spots, and may find new ones with increased contrast against the host galaxies. The resulting database will be an incredibly valuable resource to the astronomical community immediately and for years to come.
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