Probing the jet mattter content of quasar PKS 0637-752

Details Probing the jet mattter content of quasar PKS 0637-752 Probing the jet mattter content of quasar PKS 0637-752

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10541g&link_type=abstract

HST Proposal ID #10541

Computer Science

Hst Proposal Id #10541 Agn/Quasars

Scientific paper

The matter content {electron-proton vs electron-positron composition} of extragalactic jets remains unknown, despite over three decades of work. Here, we propose NICMOS/NIC3 and ACS observations of the Chandra-detected, one sided jet of the superluminal quasar PKS 0637-752 to derive the jet matter content by measuring the component of the Cosmic Microwave Background {CMB} radiation that is bulk-Comptonized {BC} by the cold electrons in the relativistically flowing large scale jet. What makes this source particularly suited for this procedure, is the absence of significant non-thermal jet emission from the 'bridge', the region between the core and the first bright knot WK7.8, guaranteeing that most of the electrons in the bridge are cold, leaving the BC scattered CMB radiation as the only significant source of photons in this region. The proposed NICMOS and ACS observations of the knot WK7.8 will provide spectral information in the IR-UV regime, which, together with existing multiwavelength data, will be used to derive the jet Doppler factor and minimum power necessary to power the knot emission as a function of the jet matter content. These will in turn be used to deduce, or strongly constrain, the actual jet matter content through comparison with the proposed NICMOS observations of the BC 'bridge' emission.

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