Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10873w&link_type=abstract
HST Proposal ID #10873. Cycle 15
Physics
Scientific paper
The properties of AGN jet flows are notoriously difficult to ascertain. We are currently studying jets in Seyferts by combining emission-line diagnostics with radio observations. We have devised a method of analysis which - with only modest and reasonable assumptions - leads to a physical description of the jet flow: its mass, momentum and energy flux, along with its density, velocity and Mach number. We have applied this method to a rich dataset on Markarian 78 and discovered that its jet is very weak, slow, and dense relative to the kind of jets found in radio loud AGN Whittle & Wilson 2004, Whittle et al 2005, 2006. Such a difference between radio quiet and radio loud jet flows would be a major result - if it were found to be generally true. We have more modest observations of a further six Seyferts with jets, but only one of these - Mkn 34 - approaches Mkn 78 as a clean enough case to allow our full analysis. Our existing VLA and STIS data are excellent, but the HST archive emission-line and continuum images are of poor quality and low resolution. We are requesting just 3 orbits to obtain higher S/N images at high resolution ACS/HRC in [OIII] 5007, [OII] 3727, green and red continuum, bringing the total dataset up to a par with that of Mkn 78. We will then be able to apply our full analysis to determine the nature of the jet flow in this second radio quiet AGN.
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