Life Cycles of Radio Galaxies

Details Life Cycles of Radio Galaxies Life Cycles of Radio Galaxies

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9501o&link_type=abstract

HST Proposal ID #9501

Physics

Hst Proposal Id #9501

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 3C 236 we found that repeated episodes of star formation and radio ejection were indeed temporally linked. We propose to obtain images of the host galaxies of 4 additional double-double radio galaxies in the NUV with STIS and the R band with ACS/HRC. The proposed HST observations will allow us to determine the existence of young star forming regions in these double-double sources. Follow up imaging and spectroscopy combined with our detailed radio imaging, will allow us to use the double-doubles to address critical questions concerning probe the relationship between star formation and AGN fueling, e.g., - Over what time scales do these processes occur ? - are they short and intense or long and gradual ?

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