The Nature of the UV Excess in the Jet of 3C273

Details The Nature of the UV Excess in the Jet of 3C273 The Nature of the UV Excess in the Jet of 3C273

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9814j&link_type=abstract

HST Proposal ID #9814

Computer Science

Hst Proposal Id #9814 Agn/Quasars

Scientific paper

We propose to obtain a 3-orbit far-ultraviolet exposure of 3C 273's jet with ACS/SBC. Combining this with our existing and HST data, we will determine the spectrum of the UV excess emission from this jet. Hence, we will establish whether the UV excess is of common origin with the jet's X-rays. This jet has long served as a test case for all extragalactic jets, as it is both long {over 20 arcsec} and bright. Our request for additional observations is motivated firstly by our VLA/HST study of the jet in 3C 273. It has provided evidence for distributed particle acceleration and a hardening of the radio-UV spectrum towards the UV, caused by a UV-excess emission component of unknown origin. Secondly, the X-ray emission mechanism for this jet remains unclear even with the well-resolved Chandra imaging. The proposed data will tell whether these two issues are related. If they are, as we predict, then we can study the X-ray emitters at the HST's full resolution using the proposed observations.

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