Statistics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11749c&link_type=abstract
HST Proposal ID #11749. Cycle 17
Statistics
Scientific paper
We propose to investigate at the highest possible angular resolution the nuclear excitation structure in > 150 nearby actively line-emitting galaxies, based on novel measurements of HST-STIS archival spectra. This sample offers the highest number statistics ever achieved for 10 parsec resolution scrutiny of the power source of the ambiguous {and ubiquitous} z ≈ 0 sources that are labeled as AGN yet do not present the usual hallmarks of an accretion-powered system. The data will be used to quantify line flux ratio gradients and isolate the spectrum from the central few tens of parsecs, allowing a more sensitive search for accretion signatures. We will be able to quantitatively test the validity of a potential H II -> Seyfert/Transition Object -> LINER evolutionary sequence, and offer crucial constraints for the true incidence of accretion activity at z ≈ 0.;
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