Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5381k&link_type=abstract
HST Proposal ID #5381
Other
Hst Proposal Id #5381 Quasars &Amp, Agn Other Active Nuclei
Scientific paper
Observations of activity in the nuclei of galaxies from the most energetic (QSOs) to the mildly energetic (LINERs) show that many of the properties are similar and the objects might be related to each other. A crucial question that arises is, ``Is the basic mechanism that powers the activity the same in all these galaxies and do the properties of active nuclei just scale with luminosity?'' Many studies suggest that QSOs and luminous Seyfert nuclei have the same basic energy source. This continuity of properties suggests an extension to still lower luminosities, but there might be a lower limit to the activity (analogous to the mass limit in main sequence stars). Hence, it is important to determine whether Low Luminosity AGNs (LLAGNs; or a certain sub-class of them) are genuinely related to classical AGNs, or whether instead their properties might be due to other physical processes. In this proposal we request FOS and PC observations of 4 LLAGNs (detected with ROSAT) to determine the physical processes responsible for UV radiation in these objects. The results of this analysis will not only help bridge the gap between LLAGNs and normal galaxies, but answer the following question: How similar are the LLAGNs to the higher luminosity AGNs? More specifically, what is the dominant mechanism for the production of ionizing radiation?
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