Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9897o&link_type=abstract
HST Proposal ID #9897
Physics
Hst Proposal Id #9897 Agn/Quasars
Scientific paper
Now, for the first time, we can probe the duration of nuclear activity and its duty cycle and the relationship between the growth of the bulge {via a starburst} and the growth of the BH {via fueling the AGN}. We have identified a class of powerful radio galaxy which displays both an outer 'older' radio source as well as an inner `younger' radio source. These 'double-doubles' are sources in which the current radio source is propagating outwards through the relic of the previous epoch of activity. In 3C236 we found that repeated episodes of star formation and radio ejection were indeed temporally linked. We propose to obtain deep FUV, NUV, U, and V images and low dispersion optical spectroscopy of the star forming regions in the disk of 3C236. The proposed HST observations, when combined with our detailed radio imaging, will allow us to study the time scales of nuclear activity, its duty cycle, and the fueling/triggering process by age dating the old and young radio structures and age dating the star formation episodes in the host galaxy. The combination of these two independent and complementary techniques for measuring the relevant time scales will allow us for the first time to address {1} the time scales of activity in individual objects, {2} the physics of the fueling of the central engine, and {3} the implications for the apparently tight coupling between BH and bulge mass growth.
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