Black Holes and Gas Disks in a Complete Sample of Radio Loud UGC Ellipticals

Computer Science

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Hst Proposal Id #6673 Agn

Scientific paper

We propose to obtain WFPC2 images in HAlpha and two broad-band colours of a complete sample of very nearby {d 50 Mpc} radio-loud galaxies. With these data, we will be able to {1} determine the luminosity profiles and stellar populations on the tens of parsec scale; {2} detect nuclear regions or disks of gas and dust. Our data will be compared with the wealth of similar data on nearby normal elliptical galaxies in the HST archive. Existing HST images of nearby normal and powerful 3CR galaxies suggest that we should detect central gas and disks in the majority {>50%} of our sample. We will later use STIS for efficient mapping of the kinematics and excitation state of the gaseous disks identified in our imaging study. Such kinematic followup observations should allow us both to `weigh' the central black hole masses in our sample and to look for kinematic clues as to why some central objects are active. The excellent comparisons possible between our radio- -loud sample and similar studies of nearby radio-quiet ellipticals and lenticulars should provide a powerful statistical means for separating the processes associated with normal galaxy evolution from those responsible for the nuclear activity. Large statistical studies of this kind are crucial to understanding central black holes and their relationship with nuclear activity and galaxy evolution.

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