Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342208s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #422.08; Bulletin of the American Astronomical Society, Vol. 41, p.241
Astronomy and Astrophysics
Astronomy
Scientific paper
Using Chandra ACIS-I exposures, we have constrained the pressure of the jet in Centaurus A over distances of 125-3940 pc (7-220 arcsec) from the nucleus. A fluid model of the jet was used to study its velocity, momentum flux, and mass flow rate. Observed jet properties are found to be inconsistent with purely adiabatic flow, so we have included mass injection and the associated dissipation in our models. Allowing the entrainment of stellar mass loss alone, if the power of the jet is constant, we are able to make consistent models for this overconstrained flow. Simulations with the model favored initial jet speeds in the first 100 pc (5.6 arcsec) from the nucleus at approximately 0.75 c and mass densities 10-4-10-3 times the external densities. The stellar matter injection dominates the mass of the jet, roughly tripling the mass flux by approximately 3600 pc (200 arcsec) from the nucleus. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.
Kraft Ralph
Nulsen Paul
Stark David
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